SJ 20673-1998 General specification for military electromagnetic shielding rubber gasket materials
Some standard content:
General specification for militaryelectromagnetic shielding elastomer for military electromagnetic shielding rubber gasket materials gaskets1998-03-11issued
1998-05-01implemented
Approved by the Ministry of Electronics Industry of the People's Republic of China1
Contents of the above topic
Applicable scope
Classification,
Referenced documents
Detailed specifications
Qualification identification.
Raw materials..
Performance characteristics
3.5 Environment.
3.6 Standard price
3.7 Appearance
Quality assurance regulations
Inspection responsibility.
4.2 Inspection classification...
4.3 Inspection conditions
Identification inspection
4.5 Quality cover consistency inspection.
Packaging inspection.
Inspection method.
Delivery preparation.
Packaging.
5.3 Transportation and storage.
Marking.
Instructions
6.1 Intended use..
6.2 Contents of ordering documents
6.3 Definitions
Appendix A Volume resistivity of rubber gasket material Surface probe method (reference part) TKANrKAca-
1 Scope
1.1 Subject matter
Military standard of the electronics industry of the People's Republic of China General specification for military electromagnetic shielding elastomer for gaskels SJ 20673 -- 1998
This specification specifies the requirements, quality assurance provisions, delivery preparation and instructions for blended military electromagnetic shielding rubber gasket materials (hereinafter referred to as rubber gasket materials). 1.2 Scope of application
This specification applies to the development, production and use of various military electromagnetic shielding rubber gasket materials used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., when electromagnetic shielding is required. 1.3 Classification
Classification is carried out according to the main conductive materials that constitute the rubber gasket material. The naming method adopts the following form:
Main conductive material name plus rubber elastomer name Na basic name 1.3.1 Main conductive material names such as: Ag, Cu, Ag/Cu, Ag/Al, Ni, FeNi alloy, etc. 1.3.2 Rubber elastomer names such as: nitridone rubber, silicone rubber, fluorosilicone rubber, etc. 1.3.3 Basic name: electromagnetic shielding rubber gasket material. 1.3.4 Example:
2 Referenced Documents
Silicone rubber
Electromagnetic screen rubber pad material
Basic name: Electromagnetic screen rubber pad material - Rubber elastomer: Silicone rubber
Main conductive material: Copper plated short
CB191-90 Pictorial symbol for packaging, storage and transportation
CB/T 528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T529-91 Determination of tear strength of vulcanized rubber (trouser-shaped, right-angled and crescent-shaped test specimens) Issued by the Ministry of Electronics Industry of the People's Republic of China on March 11, 1998, implemented from May to January 1998
SJ 20673 -- 1998
GB/T 531-92 Test method for Shore A hardness of vulcanized rubber GB 775987 Determination of constant deformation compression set of mercapto rubber under normal and high temperature GJB150.3-86 Environmental test methods for military equipment High temperature test GJB150.4-86 Environmental test methods for military equipment Force method Low temperature test GJR150.9-86 Environmental test methods for military equipment Wet heat test GJB151A-97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152A-97 Measurement of electromagnetic emission and sensitivity of military equipment and subsystems GJB 179A-96 Count sampling inspection procedures and tables GJB 360A-96 Test methods for electronic and electrical components Sf20672-1998 Measurement method of shielding quality of electromagnetic shielding pads 3 Requirements
3.1. Detailed specifications
Each type of rubber pad material shall comply with the requirements of this specification and the detailed specifications; if there is a conflict between this specification and the detailed specifications, the detailed specifications shall prevail.
3.2 Qualification
The rubber gasket material submitted according to this specification shall be a rubber gasket material that has been qualified or approved. 3.3 Raw materials
Raw materials that can make the rubber gasket material meet the performance requirements of this specification shall be used. The acceptance or approval of any raw materials shall not be regarded as the basis for the acceptance of the rubber gasket material. 3.4 Performance characteristics
The performance characteristics of the rubber gasket material shall meet the requirements of Table 1. Table 1 Performance characteristics
Acid shielding quality (10kHz－1GHz) dB
Volume resistivity Q-cm
Volume resistivity
Shore hardness A
After tensile damage
During vibration
After moving
After EMP test
After life test
Tear strength Pa (kgf/cm)
Tear elongation at break %
Compression set
Tear strength N/m (kgl/cm)
Ambient temperature ℃
3.5 Environment
>9.B× 10 (10)
80 ~ 300
>3.92×10 (4)
65 ~ + 160
- 65 + 125
55- + 160
55 ~ + 125
- 45 ~ + 125
iKAoNrKAca-
3.5.1 Low temperature test
SJ 20673 --- 1998
After the low temperature storage test of rubber tree pad material is carried out according to GJB150.4, the surface is not allowed to have cracks, peeling, etc. 3.5.2 High temperature test
After the commercial storage test of rubber lining material is carried out according to GB150.3, the surface is not allowed to have cracks, peeling, etc. 3.5.3 Temperature shock
Rubber lining material shall be subjected to humidity punch-out test according to the test conditions specified in Table 2. After the test, the surface is not allowed to have cracks, peeling, etc.
Number of cycles
3.5.4 Heat resistance
Temperature shock test conditions
Test strip
Temperature ℃
25 ± 10
25 ± 10
After the rubber lining material is subjected to the damp heat test according to GIB150.9, there should be no cracks or peeling on the surface. 3.6 Marking
Timemin
The name, weight, production batch number, trademark, manufacturing date, name of the manufacturing unit, etc. should be marked on the packaging box of the rubber lining material: the marking should be complete and clear.
3.7 Appearance
The surface of the rubber pad material should not have burrs and obvious holes, as well as impurities outside the formula: 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection item described in this specification. 4.1.1 Qualification Responsibility
All rubber pad materials must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality outline: If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the rubber pad materials submitted for acceptance meet the contract requirements. Quality consistency samples are not allowed to submit products that are known to be defective, nor can the ordering party be required to accept defective products. 4.2 Inspection categories
The inspections specified in this specification are divided into:
a. Identification inspection (type inspection);
b. Quality consistency inspection.
4.3 Test conditions
SJ 20673 -- 1998
Unless otherwise specified, the test shall be carried out under the following standard atmospheric conditions: Temperature: 15~35℃;
Relative humidity: 20%~80%;
Air pressure: 86~106kPa
If the parameters to be tested depend on temperature, humidity and air pressure, and this dependence is unknown, the measurement and test can be carried out under the following standard atmospheric conditions of arbitration test: Temperature: 25±1℃;
Relative humidity: 48%-52%;
Air pressure: 86-106kPao
4.4 Identification test
Identification test must be carried out for rubber gasket materials during design and production finalization. Identification test shall be carried out in a laboratory approved by the superior identification agency. The samples used shall be rubber gasket materials produced by the equipment and processes commonly used in production. 4.4.1 Inspection Procedure
The identification inspection consists of the items specified in Table 3 and is carried out in the order shown; after the samples pass the inspection of one group, they are divided into four groups and inspected separately.
Table 3 Identification Inspection
Inspection Items
Screen Knock Quality
Volume Electric Group
Tensile Destruction
Tear Gradual Strength
Tear Elongation at Break
Compression Permanence
Tear Strength
Low Leakage Test
Temperature Test
Temperature Shock
Wet Heat
4.4.2 Unqualified
Requirement Article No.
Inspection Method Article No.
Sample Size
Acceptance Judgment Number
If the number of unqualified samples is greater than the acceptance judgment number specified in Table 3, the setting inspection is unqualified and the identification approval cannot be given. iiKAoNirAca
4.4.3 Maintenance of Qualification
SJ 26673 1998
In order to maintain the qualification of the appraisal, the contractor shall submit a report to the superior appraisal body every 12 months as the basis for maintaining the qualification of the appraisal. The report shall include the following: a. Summary of the results of the completed product delivery inspection (batch-by-batch inspection), at least the number of qualified batches and the number of unqualified batches shall be given. b. Summary of the test results of the periodic inspections that have been carried out. The summary shall include the number of unqualified samples and the test mode, and shall also include the results of all periodic inspections carried out and completed during the 12-month interval. If the summary of the test results shows that the requirements of this specification and the detailed specification are not met, and corrective measures approved by the superior appraisal body are not taken, the unqualified rubber lining material will be withdrawn from the monthly list of qualified products. If there is no production during the reporting period, a report should be submitted to prove that the contractor still has the ability and facilities to produce this rubber gasket material; if there is still no production for two consecutive reporting periods, the contractor shall be required to submit representative rubber gasket materials according to the decision of the superior appraisal agency, and be inspected according to the requirements of the appraisal inspection, and explain the reasons for non-production. 4.5 Quality consistency inspection
4.5.1 Batch inspection
Batch inspection is the delivery inspection of rubber gasket materials. For continuously produced products, each batch should be subject to batch inspection. 4.5.1.1 The inspection batch should consist of the same type of rubber gasket materials produced under basically the same conditions and submitted for inspection at the same time. 4.5.1.2 Batch inspection consists of the items specified in Table 4 and is carried out in the order shown. Table 4 Batch inspection
Inspection items
Electrical rate
Requirements Article number
Inspection method Article number
4.5.1.3 Batch inspection shall be conducted by sampling and judging once according to GJB 179A. Serious defects
Minor defects
Inspection level: Generally, general inspection level II is adopted. When the sample size must be reduced at the expense of increasing the risk of the ordering party, special inspection level S-2 may be adopted.
Defect classification: Volume resistivity is a serious defect, and the rest are minor defects. 4.5.1.4 After the inspection, a complete record and a report signed by the inspector should be submitted. For qualified products, a certificate proving the qualification should be submitted.
4.5.2 Periodic inspection
4.5.2.1 For batch-produced rubber pad materials, each batch should be subject to periodic inspection; for continuously produced rubber pad materials, periodic inspection should be conducted at least once a year: when there are major changes in materials and processes that may affect product performance, periodic inspection should also be conducted.
4.5.2.2 Periodic inspection consists of the items specified in Table 5 and is conducted in the order shown. 5
Inspection items
Shielding quality
Tensile failure
Break strength
Break elongation
Compression deformation
Tear strength
Low temperature test
High temperature test
Temperature shock
Hot-mixability
Requirements Article number
SJ 20673 -- 1998
Table 5 Periodic inspection
Inspection method Article number
Sample size
Acceptance judgment number
4.5.2.3 The samples for periodic inspection shall be taken from the inspection batches that have passed the batch inspection. The sample size and acceptance judgment number are specified in Table 5.
4.5.2.4 Unqualified
If the number of unqualified samples is greater than the acceptance judgment number specified in Table 5, the periodic inspection is unqualified. 4.6 Packaging inspection
The packaging boxes, packaging boxes and labels of rubber gasket materials should be fully inspected. 4.7 Inspection method
4.7.1 Labels and appearance
Check whether they meet the requirements by visual inspection.
4.7.2 Shielding quality
Measure the plate according to SJ 20672 and meet the following requirements: a. The sample to be tested should be a flat rubber sheet. The dimensions of the sample to be tested are shown in 5.2.1 of SJ20672. b. The surface of the sample to be tested should be clean, free of dirt and deformation. During measurement, the compression deformation of the sample to be tested should be kept within the range of 5%~15%. 4.7.3 Volume resistivity
4.7.3.1 Test instruments and requirements
a. Ohmmeter - range is 10~10-50, accuracy is ±0.2%b. Thickness gauge - when in use, it must be placed on a base platform with a diameter of 2cm. This platform should not change more than 0.025mm under a pressure of 0.98N (0.[kzf)
c. The electrode uses a silver or gold-plated electrode with a diameter of 1.43cm. When in use, it is in contact with the sample to be tested with a cross-sectional area of 1.61cm2, and there must be a suitable structure to connect the electrode to the terminal of the ohmmeter, as shown in Figure d. Use a suitable fixture or device to support the silver electrode and the sample to be tested, and use the correct method to apply a pressure of 1.12×10°V (11.4k) to the sample between the two electrodes. 4.7.3.2 Preparation of the sample to be tested
KAoNrKAca-
Sample to be tested
SI 20673 1998
Figure丨Electrode connection diagram
Non-current lead!
Potential line!
Wire 1
Core lead?
a. The sample to be tested has a humidification of 0.14~0.3cm1 and a diameter of 1.43±0.25cm; b. The surface of the sample to be tested must be clean and free of dirt, deformation and burrs; c. The sample to be tested must be exposed to the conditions of relative humidity of 45%~75% and temperature of 23±2℃ for 3h before testing.
4.7.3.3 Test Preparation of the electrode
a. Before testing, the electrodes must be carefully cleaned with alcohol; b. The electrodes must be properly matched, and the contact surfaces should be flat and parallel to each other. 4.7.3.4 Test steps
a. Measure and record the thickness of the contact surface with a thickness gauge; b. The sample must have enough contact surface to ensure full contact with the electrode; c. Place the sample to be tested between the two electrodes and apply a pressure of 1.12×10°N (11.4kg); d. Under the condition that the contact pressure remains unchanged, the test should be completed within 2min. 4.7.3.5 Calculation
Volume resistivity is calculated as follows:
Where: p is volume resistivity, n'cm;
R is the measured resistance, :
A is the sample area, cn;
L is the sample thickness, cm.
4.7.3.6 Other methods for measuring volume resistivity The surface probe method (see Appendix A) can also be used for measurement. If there is a dispute, the method in 4.7.3.5 shall prevail. 4.7.4 Electrical stability after tensile damage
The sample to be tested is pulled apart by CB528. Within 30min, a test sample is made from the length of the tensile fracture (see Figure 2), and the volume resistivity is measured according to 4.7.3. 4.7.5 Electrical stability during vibration
4.7.5.1 Prepare a rectangular frame of the sample to be tested. The length of the sample to be tested is 95±0.5mm, the width is 70±0.5mm, the width of the rectangular perimeter is 4.0±0.5mm, and the thickness is 1.5±0.1mm. 4.7.5.2 Before testing, the contact surfaces of the cover plate, flange, and the sample to be tested must be cleaned thoroughly; the test equipment, instruments, etc. must be calibrated.
SJ 20673 +- 1998
Advantages of the monkey
Figure 2 Schematic diagram of sample preparation
4.7.5.3 Fix the sample to be tested on the aluminum cover (see Figure 3): The flange is equipped with an input/output receiver. The surface roughness of the flange and cover plate is 0.8~1.6um, and the surface is first plated and then gold-plated; during the test, the sample to be tested should produce 5%10% deformation. The pressure of deformation of the main body is determined by the degree of tightening of the bolts. The bolts should be insulated from the surface of the flange and cover plate. Test sample
Vibrator surface
Figure 3 Schematic diagram of sample fixing
4.7.5.4 Use an I-O meter with a sensitivity of 0.01m to measure the resistance of the cover plate, flange and test sample. According to formula (1) in 4.7.3.5, calculate the volume resistivity of the test sample before vibration. 4.7.5.5 Fix the flange with the test sample on the vibrator. The plane of the sample should be parallel to the vibration axis, and the vibration axis should be in the vertical direction.
4.7.5.6 Test according to test condition C in GJB360A method 204 high-frequency vibration test. During the test, the speed should be swept from 200Hz to 1000Hz at a speed of 2 times per minute, select the lowest resonance frequency, resonate for 1min, and measure the output acceleration during vibration (for reference only) and the maximum resistance of the test sample. After that, stop for 30 seconds and measure the maximum resistance of the sample after vibration. According to formula (1) in 4.7.3.5, calculate the volume resistivity of the sample during vibration and after vibration respectively. Forward: The maximum response amplitude is twice higher than the specified amplitude, which is called resonance. 4.7.6 EMP durability
4.7.6.1 Carry out EMP test according to GJB151A and GJB 152A4.7.6.2 After the EMP test, measure the resistance of the sample. According to formula 4.7.3.5 (1), calculate the volume resistivity after EMP test. This value meets the requirements of Table 1. 8
KAoNrKAca-
4.7.7 Hardness
Test according to GB531.
4.7.8 Tear strength
Test according to GB 528.
4.7.9 Elongation at break
Tested in accordance with GB528.
4.7.10 Compression set
Tested in accordance with GB 7759.
4.7.11 Tear strength
Tested in accordance with GB 529.
4.7.12 Low temperature
SI 20673 1998
Tested in accordance with GJB150.4. After the test, the tested sample shall be placed at room temperature for 21 and the appearance shall be inspected. 4.7.13 High temperature
Tested in accordance with GIB150.3. After the test, the tested sample shall be placed at room temperature for 2h and the appearance shall be inspected. 4.7.14 Temperature shock
Tested in accordance with GJB360A method 107. After the test, the tested sample shall be placed at room temperature for 2h and the appearance shall be inspected. 4.7.15 Wet potential
Perform according to GJB150.9. And should meet the following requirements: a. Place the sample in the test box, there should be a certain distance between the tested samples, and they cannot overlap each other, etc. b. After the wet heat test, the tested sample should be placed at room temperature for 2 hours and inspected for appearance. 4.7.16 Life test
4.7.16.1 Tested sample: 13cm long, 8cm wide, 0.14~0.3cm thick c4.7.16.2 Measure and record its volume resistivity. 4.7.16.3 Fix the tested sample with a metal clamp coated with a 0.05mm thick non-conductive film, and its deformation should be within 7% under a pressure of 3.43×10°Pa (3.5kgf/cm2). 4.7.16.4 Place the sample in the oven in the clamped state and heat it at the highest use temperature ±2℃ for 1000h; in the non-clamped state, heat it at 1.25 times the highest use temperature ±2℃ for 48h. 4.7.16.5 After taking the sample out of the oven, cool it for 1h, clean the surface of the sample with alcohol, and dry it naturally for 1h. 4.7.16.6 Measure the volume resistivity after the life test according to 4.7.3. 5 Delivery preparation
5.1 Packaging
Rubber gasket materials should be packed in packaging boxes, and rubber village materials should be separated by soft packaging materials. 5.2 Packing
The packaging box should be firm and reliable, and each packaging box can only contain rubber gasket materials of the same model and specification. The empty space in the box should be filled with soft packaging materials.
The packaging box should generally contain a certificate of conformity, instructions, and packing list. 5.3 Transportation and Storage
5.3.1 Transportation
SI 20673 - 1998
5.3.1.1 Packages containing rubber gasket materials should be able to be transported by any means of transportation. During transportation, they should avoid direct exposure to rain and thunder, sunlight, and strictly prohibit contact with oil, grease, acid, alkali and other items that may damage the quality of rubber. 5.3.1.2 During loading, unloading and transit transportation, proper operation should be carried out. If stacking is required, damage to the rubber gasket materials due to excessive height or weight should be avoided.
5.3.2 Storage
Usually, rubber gasket materials should be packed according to regulations and then stored in the warehouse. The temperature in the warehouse should be below 30, preferably below 15, the relative humidity should be less than 8%, and the packages should be at least 1m away from the heat source. The warehouse should be kept ventilated, dry and prevent direct sunlight. Rubber padding materials must not be mixed with oils, flammable items, chemical corrosive items, and other items that can easily deteriorate rubber padding materials.
The storage period of rubber padding materials is generally three years. During storage, they should be put in and out of the warehouse in an orderly manner. 5.4 Marking
The marking on the rubber padding material packaging box is shown in Article 3.6. The marks on the packing box are:
a. The outer packing box should indicate: the name, quantity, weight, trademark, packaging date, name of the manufacturer, etc. of the rubber tree pad material;
b. The outer packing box should have marks such as "handle with care", "moisture-proof", "upward", and "fireproof". The marks should comply with the provisions of GB191, and the marks should not change color or fall off due to natural conditions and transportation conditions. Other marks can be selected according to the rubber village pad material and packaging method and materials in GB191;
e. Unless otherwise specified in the contract, all words on the packing box, except numbers and models, should generally be Chinese characters; t. The marks should be in two eye-catching positions perpendicular to each other on the packing box, and should be on the same On a horizontal line. 6 Notes
6.1 Intended use
The rubber pad material specified in this specification is intended to be used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., to perform system or subsystem electrical shielding. 6.2 Contents of ordering documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. The name and number of the detailed specification;
c. Special requirements; including the environmental conditions for the use of the product, packaging, transportation requirements, etc.; d. Numerical base, etc.
6.3 Definitions
All terms and definitions in this specification comply with SI20672. — 10
TKANiKAca-5 Fix the flange with the sample to be tested on the vibrator. The plane of the sample to be tested should be parallel to the vibration axis, and the vibration axis should be in the vertical direction.
4.7.5.6 Carry out the test according to the test condition C in the high-frequency vibration test of GJB360A method 204. During the test, the frequency should be scanned from 200Hz to 1000Hz at a speed of 2 times per minute, and the lowest resonance frequency should be selected. Resonance should be maintained for 1 minute, and the output acceleration during vibration (for reference only) and the maximum resistance of the sample to be tested should be measured. After that, stop for 30 seconds and measure the maximum resistance of the sample to be tested after vibration. According to formula (1) in 4.7.3.5, calculate the volume resistivity of the sample during and after vibration. Forward: The maximum response amplitude is higher than 2 times the specified amplitude, which is called resonance. 4.7.6 EMP durability
4.7.6.1 Carry out EMP test according to GJB151A and GJB 152A. 4.7.6.2 After the EMP test, measure the resistance of the tested sample. Calculate the volume resistivity after the EMP test according to formula 4.7.3.5 (1). This value meets the requirements of Table 1. 8
KAoNrKAca-
4.7.7 Hardness
Test according to GB531.
4.7.8 Tensile strength
Test according to GB 528.
4.7.9 Elongation at break
Test according to GB528.
4.7.10 Compression set
Test according to GB 7759.
4.7.11 Tear strength
Tested in accordance with GB 529.
4.7.12 Low temperature
SI 20673 1998
Tested in accordance with GJB150.4. After the test, the tested sample should be placed at room temperature for 21 and the appearance should be inspected. 4.7.13 High temperature
Tested in accordance with GIB150.3. After the test, the tested sample should be placed at room temperature for 2h and the appearance should be inspected. 4.7.14 Temperature shock
Tested in accordance with GJB360A method 107. After the test, the tested sample should be placed at room temperature for 2h and the appearance should be inspected. 4.7.15 Moisture potential
Tested in accordance with GJB150.9. And should meet the following requirements: a. Place the sample in the test box, there should be a certain distance between the test samples, and they should not overlap each other, etc. b. After the damp heat test, the tested sample should be placed at room temperature for 2 hours and inspected for appearance. 4.7.16 Life test
4.7.16.1 Test sample: 13cm long, 8cm wide, 0.14~0.3cm thick4.7.16.2 Measure and record its volume resistivity. 4.7.16.3 Fix the tested sample with a metal clamp coated with a 0.05mm thick non-conductive film on the surface, and its deformation should be within 7% under a pressure of 3.43×10°Pa (3.5kgf/cm2). 4.7.16.4 Place the sample in an oven in a clamped state and heat it at the highest use temperature ±2℃ for 1000 hours; in a non-clamped state, heat it at 1.25 times the highest use temperature ±2℃ for 48 hours. 4.7.16.5 After taking out the sample from the oven, cool it for 1 hour, clean the surface of the sample with alcohol, and dry it naturally for 1 hour. 4.7.16.6 Measure the volume resistivity after the life test according to 4.7.3. 5 Delivery preparation
5.1 Packaging
The rubber gasket material should be packed in a packaging box, and the rubber village materials should be separated by soft packaging materials. 5.2 Packing
The packaging box should be firm and reliable, and each packaging box can only contain rubber gasket materials of the same model and specification. The empty space in the box should be filled with soft packaging materials.
The packaging box should generally contain a certificate of conformity, instructions, and packing list. 5.3 Transportation and storage
5.3.1 Transportation
SI 20673 - 1998
5.3.1.1 Packages containing rubber gasket materials should be able to be transported by any means of transportation. During transportation, the rubber should be protected from direct rain and thunder, sunlight and exposure. It is strictly forbidden to contact with oil, grease, acid, alkali and other items that may damage the quality of rubber. 5.3.1.2 During loading and unloading and transit transportation, proper operation should be carried out. If stacking is required, the rubber padding materials should be protected from damage due to excessive stacking and overweight.
5.3.2 Storage
Usually, rubber padding materials should be packed according to regulations and then stored in the warehouse. The temperature in the warehouse should be below 30°C, preferably below 15°C, the relative humidity should be below 8%, and the package should be at least 1m away from the heat source. The warehouse should be kept ventilated, dry and protected from direct sunlight. Rubber padding materials should not be mixed with oil, flammable items, chemical corrosive items and other items that may easily deteriorate the rubber padding materials.
The storage period of rubber padding materials is generally three years. During storage, the materials should be transported in and out of the warehouse in an orderly manner. 5.4 Marking
The markings on the rubber tree cushion material packaging box are shown in Article 3.6. The markings on the packaging box are:
a. The outer packaging should indicate: the name, quantity, weight, trademark, packaging date, name of the manufacturing unit, etc. of the rubber tree cushion material;
b. The outer packaging box should have signs such as "Handle with Care", "Moisture-proof", "Upward", and "Fireproof". The markings should comply with the provisions of GB191, and the markings should not change color or fall off due to natural conditions and transportation conditions. Other markings can be selected according to the rubber village cushion material and packaging method and materials in GB191;
e. Unless otherwise specified in the contract, all text on the packaging box, except numbers and models, should generally be Chinese characters; t. The markings should be in two conspicuous positions perpendicular to each other on the packaging box, and should be on the same On a horizontal line. 6 Notes
6.1 Intended use
The rubber pad material specified in this specification is intended to be used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., to perform system or subsystem electrical shielding. 6.2 Contents of ordering documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. The name and number of the detailed specification;
c. Special requirements; including the environmental conditions for the use of the product, packaging, transportation requirements, etc.; d. Numerical base, etc.
6.3 Definitions
All terms and definitions in this specification comply with SI20672. — 10
TKANiKAca-5 Fix the flange with the sample to be tested on the vibrator. The plane of the sample to be tested should be parallel to the vibration axis, and the vibration axis should be in the vertical direction.
4.7.5.6 Carry out the test according to the test condition C in the high-frequency vibration test of GJB360A method 204. During the test, the frequency should be scanned from 200Hz to 1000Hz at a speed of 2 times per minute, and the lowest resonance frequency should be selected. Resonance should be maintained for 1 minute, and the output acceleration during vibration (for reference only) and the maximum resistance of the sample to be tested should be measured. After that, stop for 30 seconds and measure the maximum resistance of the sample to be tested after vibration. According to formula (1) in 4.7.3.5, calculate the volume resistivity of the sample during and after vibration. Forward: The maximum response amplitude is higher than 2 times the specified amplitude, which is called resonance. 4.7.6 EMP durability
4.7.6.1 Carry out EMP test according to GJB151A and GJB 152A. 4.7.6.2 After the EMP test, measure the resistance of the tested sample. Calculate the volume resistivity after the EMP test according to formula 4.7.3.5 (1). This value meets the requirements of Table 1. 8
KAoNrKAca-
4.7.7 Hardness
Test according to GB531.
4.7.8 Tensile strength
Test according to GB 528.
4.7.9 Elongation at break
Test according to GB528.
4.7.10 Compression set
Test according to GB 7759.
4.7.11 Tear strength
Tested in accordance with GB 529.
4.7.12 Low temperature
SI 20673 1998
Tested in accordance with GJB150.4. After the test, the tested sample should be placed at room temperature for 21 and the appearance should be inspected. 4.7.13 High temperature
Tested in accordance with GIB150.3. After the test, the tested sample should be placed at room temperature for 2h and the appearance should be inspected. 4.7.14 Temperature shockbZxz.net
Tested in accordance with GJB360A method 107. After the test, the tested sample should be placed at room temperature for 2h and the appearance should be inspected. 4.7.15 Moisture potential
Tested in accordance with GJB150.9. And should meet the following requirements: a. Place the sample in the test box, there should be a certain distance between the test samples, and they should not overlap each other, etc. b. After the damp heat test, the tested sample should be placed at room temperature for 2 hours and inspected for appearance. 4.7.16 Life test
4.7.16.1 Test sample: 13cm long, 8cm wide, 0.14~0.3cm thick4.7.16.2 Measure and record its volume resistivity. 4.7.16.3 Fix the tested sample with a metal clamp coated with a 0.05mm thick non-conductive film on the surface, and its deformation should be within 7% under a pressure of 3.43×10°Pa (3.5kgf/cm2). 4.7.16.4 Place the sample in an oven in a clamped state and heat it at the highest use temperature ±2℃ for 1000 hours; in a non-clamped state, heat it at 1.25 times the highest use temperature ±2℃ for 48 hours. 4.7.16.5 After taking out the sample from the oven, cool it for 1 hour, clean the surface of the sample with alcohol, and dry it naturally for 1 hour. 4.7.16.6 Measure the volume resistivity after the life test according to 4.7.3. 5 Delivery preparation
5.1 Packaging
The rubber gasket material should be packed in a packaging box, and the rubber village materials should be separated by soft packaging materials. 5.2 Packing
The packaging box should be firm and reliable, and each packaging box can only contain rubber gasket materials of the same model and specification. The empty space in the box should be filled with soft packaging materials.
The packaging box should generally contain a certificate of conformity, instructions, and packing list. 5.3 Transportation and storage
5.3.1 Transportation
SI 20673 - 1998
5.3.1.1 Packages containing rubber gasket materials should be able to be transported by any means of transportation. During transportation, the rubber should be protected from direct rain and thunder, sunlight and exposure. It is strictly forbidden to contact with oil, grease, acid, alkali and other items that may damage the quality of rubber. 5.3.1.2 During loading and unloading and transit transportation, proper operation should be carried out. If stacking is required, the rubber padding materials should be protected from damage due to excessive stacking and overweight.
5.3.2 Storage
Usually, rubber padding materials should be packed according to regulations and then stored in the warehouse. The temperature in the warehouse should be below 30°C, preferably below 15°C, the relative humidity should be below 8%, and the package should be at least 1m away from the heat source. The warehouse should be kept ventilated, dry and protected from direct sunlight. Rubber padding materials should not be mixed with oil, flammable items, chemical corrosive items and other items that may easily deteriorate the rubber padding materials.
The storage period of rubber padding materials is generally three years. During storage, the materials should be transported in and out of the warehouse in an orderly manner. 5.4 Marking
The markings on the rubber tree cushion material packaging box are shown in Article 3.6. The markings on the packaging box are:
a. The outer packaging should indicate: the name, quantity, weight, trademark, packaging date, name of the manufacturing unit, etc. of the rubber tree cushion material;
b. The outer packaging box should have signs such as "Handle with Care", "Moisture-proof", "Upward", and "Fireproof". The markings should comply with the provisions of GB191, and the markings should not change color or fall off due to natural conditions and transportation conditions. Other markings can be selected according to the rubber village cushion material and packaging method and materials in GB191;
e. Unless otherwise specified in the contract, all text on the packaging box, except numbers and models, should generally be Chinese characters; t. The markings should be in two conspicuous positions perpendicular to each other on the packaging box, and should be on the same On a horizontal line. 6 Notes
6.1 Intended use
The rubber pad material specified in this specification is intended to be used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., to perform system or subsystem electrical shielding. 6.2 Contents of ordering documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. The name and number of the detailed specification;
c. Special requirements; including the environmental conditions for the use of the product, packaging, transportation requirements, etc.; d. Numerical base, etc.
6.3 Definitions
All terms and definitions in this specification comply with SI20672. — 10
TKANiKAca-7.16.3 Fix the sample with a metal clamp coated with a 0.05mm thick non-conductive film, and its deformation should be within 7% under a pressure of 3.43×10°Pa (3.5kgf/cm2). 4.7.16.4 Place the sample in an oven in a clamped state and heat it at the highest use temperature ±2℃ for 1000h; in a non-clamped state, heat it at 1.25 times the highest use temperature ±2℃ for 48h. 4.7.16.5 After taking the sample out of the oven, cool it for 1h, clean the surface of the sample with alcohol, and dry it naturally for 1h. 4.7.16.6 Measure the volume resistivity after the life test according to 4.7.3. 5 Delivery preparation
5.1 Packaging
The rubber pad material should be packed in a packaging box, and the rubber village materials should be separated by soft packaging materials. 5.2 Packing
The packing box should be firm and reliable. Each packing box can only contain rubber gasket materials of the same model and specification. The empty space in the box should be filled with soft packaging materials.
The packing box should generally contain a certificate of conformity, instructions, and packing list. 5.3 Transportation and storage
5.3.1 Transportation
SI 20673 - 1998
5.3.1.1 Packages containing rubber gasket materials should be able to be transported by any means of transportation. During transportation, they should avoid direct exposure to rain and thunder, sunlight, and contact with oil, grease, acid, alkali and other items that may damage the quality of rubber. 5.3.1.2 During loading, unloading, and transit transportation, proper operation should be carried out. If stacking is required, damage to the rubber gasket materials due to excessive height and weight should be avoided.
5.3.2 Storage
Usually, rubber gasket materials should be packed as required and then stored in the warehouse. The temperature in the warehouse should be below 30°C, preferably below 15°C, the relative humidity should be below 8%, and the package should be at least 1m away from the heat source. The warehouse should be ventilated, dry, and protected from direct sunlight. Rubber gasket materials should not be mixed with oils, flammable items, chemical corrosive items, and other items that can easily deteriorate rubber gasket materials.
The storage period of rubber gasket materials is generally three years. During storage, they should be in and out of the warehouse in an orderly manner. 5.4 Marking
The marking on the rubber gasket material packaging box is shown in Article 3.6. The marks on the packing box are:
a. The outer packing box should indicate: the name, quantity, weight, trademark, packaging date, name of the manufacturer, etc. of the rubber tree pad material;
b. The outer packing box should have marks such as "handle with care", "moisture-proof", "upward", and "fireproof". The marks should comply with the provisions of GB191, and the marks should not change color or fall off due to natural conditions and transportation conditions. Other marks can be selected according to the rubber village pad material and packaging method and materials in GB191;
e. Unless otherwise specified in the contract, all words on the packing box, except numbers and models, should generally be Chinese characters; t. The marks should be in two eye-catching positions perpendicular to each other on the packing box, and should be on the same On a horizontal line. 6 Notes
6.1 Intended use
The rubber pad material specified in this specification is intended to be used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., to perform system or subsystem electrical shielding. 6.2 Contents of ordering documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. The name and number of the detailed specification;
c. Special requirements; including the environmental conditions for the use of the product, packaging, transportation requirements, etc.; d. Numerical base, etc.
6.3 Definitions
All terms and definitions in this specification comply with SI20672. — 10
TKANiKAca-7.16.3 Fix the sample with a metal clamp coated with a 0.05mm thick non-conductive film, and its deformation should be within 7% under a pressure of 3.43×10°Pa (3.5kgf/cm2). 4.7.16.4 Place the sample in an oven in a clamped state and heat it at the highest use temperature ±2℃ for 1000h; in a non-clamped state, heat it at 1.25 times the highest use temperature ±2℃ for 48h. 4.7.16.5 After taking the sample out of the oven, cool it for 1h, clean the surface of the sample with alcohol, and dry it naturally for 1h. 4.7.16.6 Measure the volume resistivity after the life test according to 4.7.3. 5 Delivery preparation
5.1 Packaging
The rubber pad material should be packed in a packaging box, and the rubber village materials should be separated by soft packaging materials. 5.2 Packing
The packing box should be firm and reliable. Each packing box can only contain rubber gasket materials of the same model and specification. The empty space in the box should be filled with soft packaging materials.
The packing box should generally contain a certificate of conformity, instructions, and packing list. 5.3 Transportation and storage
5.3.1 Transportation
SI 20673 - 1998
5.3.1.1 Packages containing rubber gasket materials should be able to be transported by any means of transportation. During transportation, they should avoid direct exposure to rain and thunder, sunlight, and contact with oil, grease, acid, alkali and other items that may damage the quality of rubber. 5.3.1.2 During loading, unloading, and transit transportation, proper operation should be carried out. If stacking is required, damage to the rubber gasket materials due to excessive height and weight should be avoided.
5.3.2 Storage
Usually, rubber gasket materials should be packed as required and then stored in the warehouse. The temperature in the warehouse should be below 30°C, preferably below 15°C, the relative humidity should be below 8%, and the package should be at least 1m away from the heat source. The warehouse should be ventilated, dry, and protected from direct sunlight. Rubber gasket materials should not be mixed with oils, flammable items, chemical corrosive items, and other items that can easily deteriorate rubber gasket materials.
The storage period of rubber gasket materials is generally three years. During storage, they should be in and out of the warehouse in an orderly manner. 5.4 Marking
The marking on the rubber gasket material packaging box is shown in Article 3.6. The marks on the packing box are:
a. The outer packing box should indicate: the name, quantity, weight, trademark, packaging date, name of the manufacturer, etc. of the rubber tree pad material;
b. The outer packing box should have marks such as "handle with care", "moisture-proof", "upward", and "fireproof". The marks should comply with the provisions of GB191, and the marks should not change color or fall off due to natural conditions and transportation conditions. Other marks can be selected according to the rubber village pad material and packaging method and materials in GB191;
e. Unless otherwise specified in the contract, all words on the packing box, except numbers and models, should generally be Chinese characters; t. The marks should be in two eye-catching positions perpendicular to each other on the packing box, and should be on the same On a horizontal line. 6 Notes
6.1 Intended use
The rubber pad material specified in this specification is intended to be used in military electronic equipment, such as data processing equipment, communication equipment, mechatronics equipment, etc., to perform system or subsystem electrical shielding. 6.2 Contents of ordering documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. The name and number of the detailed specification;
c. Special requirements; including the environmental conditions for the use of the product, packaging, transportation requirements, etc.; d. Numerical base, etc.
6.3 Definitions
All terms and definitions in this specification comply with SI20672. — 10
TKANiKAca-
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.