SJ 20814-2002 General specification for military electromagnetic shielding foil
Some standard content:
Military Standard for Electronic Industry of the People's Republic of China FL:0122
SJ20814—2002
General Specification for Military Electromagnetic Shielding Foil2002-01-31 Issued
2002-05-01 Implementation
Approved by the Ministry of Information Industry of the People's Republic of China 1 Scope
Military Standard for Electronic Industry of the People's Republic of China General Specification for Military Electromagnetic Shielding Foil
Generalspecificationformilitaryelectromagnetic shielding foil1.1 Subject Content
SJ20814—2002
This specification specifies the requirements, quality assurance regulations and delivery preparation of military electromagnetic shielding foil (hereinafter referred to as shielding foil).
1.2 Scope of Application
This specification applies to the development, production and acceptance of various shielding boxes used in electromagnetic shielding of military electronic equipment. 1.3 Classification
1.3.1 Shielding foils can be divided into two categories according to their shielding categories: electromagnetic shielding foils (DC) and magnetic shielding foils (C); according to the baseband material: electromagnetic shielding foils can be divided into two categories: copper-based (Ni/Cu, Cu) and aluminum-based (Ni/AI, AI); magnetic shielding foils can be divided into two categories: Permalloy (PM) and amorphous alloy (FJT). 1.3.2 Model naming
The model naming method adopts the following form:
Shielding category Shielding foil code (PB)/baseband name Shielding foil width (X) Note: X is a range of 20~100mm.
Example 1:
Example 2:
Width is 30mm
Base tape is copper tape
Shielding foil
INi/Al
Width is 60mm
Base tape is nickel-plated aluminum
Shielding foil
The Ministry of Information Industry of the People's Republic of China issued iiKAoNikAca on January 31, 2002
Implemented on May 1, 2002
Example 3:
CPB/EJT
2Referenced documents
GB191—2000
GB2792-81|| tt||GB4851-84
GJB150.3—86
SJ20814-—2002
Width is 60mm
Base tape is amorphous alloy
Shielding box
Packaging storage and transportation pictorial mark
180° peel strength test method for pressure-sensitive adhesive tapeTest method for pressure-sensitive adhesive tape adhesion
Environmental test method for military equipmentHigh temperature testGJB150.4-86
GJB150.9—86
GJB150.11—86
GJB150.10—86
GJB 179A--96
SJ20524—95
3 Requirements
3.1 Qualification
Military equipment environmental test methods Low temperature test Military equipment environmental test methods Wet heat test Military equipment environmental test methods Salt spray test Military equipment environmental test methods Per bacteria test Count sampling inspection procedures and tables
Material shielding effectiveness measurement method
The shielding foil submitted according to this specification is a standardized shielding foil. 3.2 Materials
3.2.1 Base tape
The cut surface of the base tape of the shielding box should be flat and should not have defects such as damage and breakage. 3.2.2 Adhesive
The adhesive should be pressure-sensitive and can be directly applied to a clean and dry surface to be bonded. The adhesive should be covered with isolation paper.
3.3 Size
The size of the shielding box should meet the requirements of Table 1. Table 1 Dimensions
Model Specifications
DCPB/Ni/CuX
Electromagnetic Shielding Foil
Magnetic Shielding Box
DCPB/CuX
DCPB/Ni/AIX
DCPB/AIX
CPB/PMX
CPB/FJTX
≥16500|| tt||Width (x)
X=（203040
100）±1
Thickness (Y)
Y=(0.030.050.06
0.070.080.10)
3.4 Performance characteristics
SJ20814—2002
The performance characteristics of the shielding foil shall meet the requirements of Table 2. Table 2 Performance characteristics
DCPB/Ni/CuX or
DCPB/CuX
DCPB/Ni/AIX or
DCPB/AIX
CPB/PMX
CPB/FJTX
3.5 Environment
3.5.1 High and low temperature
Shielding effectiveness
Electromagnetic field SE ≥ 45 (2MHz 30MHz)
Plane wave SE ≥ 45 (30MHz ~ 1GHz)
Electromagnetic field SE ≥ 35 (2MHz ~ 30MHz)
Plane wave SE ≥ 35 (30MHz~1GHz)
Magnetic field SE≥20(1kHz~200kHz)
Plane wave SE≥55（30MHz～1GHz）
Magnetic field SE≥10(IkHz~200kHz)
Plane wave SE≥45（30MHz~1GHz）
Surface overlap
180° peeling
≥320
Adhesion retention
(23X24h)
After the high and low temperature test under the test conditions specified in Table 3, the shielding foil should not have debonding, curling and other phenomena, and the shielding effectiveness should meet the requirements of Table 2.
Table 3 High and low temperature test conditions
3.5.2 Damp heat
Relative humidity
After the shielding foil is tested under the damp heat test conditions specified in Table 4, there should be no debonding, curling, etc., and the shielding effectiveness should meet the requirements of Table 2.
Test cycle
High temperature and high humidity
Low temperature and high humidity
Damp heat test conditions
Test conditions
iKAoNiKAca
Relative humidity
3.5.3 Salt spray
SJ20814—2002
After the shielding foil is tested under the salt spray test conditions specified in Table 5, there should be no cracking, curling, rusting, etc. on its surface; the shielding effectiveness should meet the requirements of Table 2.
Table 5 Salt spray test conditions
3.5.4 Per-bacteria
Sodium amine solution
Salt spray deposition
(1~2)/80
Spraying method
Test time
After the shielding foil is subjected to the per-bacteria test according to GJB150.10, the growth level should be lower than the secondary requirement specified in Table 6; the decrease in 180° peel strength should be less than 10%.
Table 6 Growth level
Growth level
3.6 Product marking
No fungus formation
Fungus growth and reproduction are rare or limited. The growth range is less than 10% of the total area of the sample. The matrix is rarely used or not damaged. Almost no physical and structural changes are found. The colonies of the group spread intermittently or are loosely distributed on the surface of the matrix. The production of toxic bacteria accounts for less than 30% of the total area. The medium-scale colonization
Each bacteria grows and reproduces more than 70% of the total area of the large plate. The surface of the matrix shows chemical, physical and structural changes. The shielding box should be marked with the following content:
Model and specification of shielding foil:
Production batch number:
Trademark:
Manufacturing date;
Manufacturing unit, etc.
The mark should be complete and clear.
3.7 Appearance quality
The appearance and quality of the shielding box should meet the requirements of Table 7. Table 7 Appearance quality
Edge defect
Smooth, no tearing
No degumming after 20 unrollings
Smooth, smooth
4 Quality assurance regulations
4.1 Inspection Responsibility
SJ20814—-2002
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 of the inspection items described in this specification. 4.1.1 Responsibility for Conformity
All shielding foils 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 program. If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products.
4.2 Inspection Classification
The inspections specified in this specification are divided into:
a. Appraisal inspection;
b. Quality consistency inspection.
4.3 Inspection Conditions
Unless otherwise specified, they shall be carried out under the following conditions. Temperature: 15℃~35℃,
Relative humidity: 20%~80%;
Air pressure: the air pressure of the test site.
When there is a dispute about a parameter, it should be tested under the following conditions; Temperature: 23℃±2℃:
Relative humidity: 50±5%;
Air pressure: 86~106kPa.
4.4 Identification test
Identification test must be carried out when the shielding foil is designed and produced. Identification test should be carried out in a laboratory approved by the superior identification agency. The samples used should be products produced by commonly used equipment and processes.
4.4.1 Inspection procedure
The items and sequence of identification test should be carried out in accordance with the provisions of Table 8. 4.4.2 Inspection samples and qualified criteria
The sample size and acceptance judgment number of identification test are determined by Table 8. 4.4.3 Qualified
If the product is inspected according to Table 8 and all items meet the requirements of Chapter 3, it shall be judged as a qualified product and a qualified inspection report shall be submitted.
4.4.4 Unqualified
If the following unqualified items appear in the inspection, the following methods shall be used to deal with them: a. If the product mark and appearance quality are unqualified in the inspection, the inspection shall be stopped and the test shall be repeated after the contractor repairs it:
b. If the size is unqualified in the inspection, the inspection shall be stopped, the cause shall be found out and an analysis report shall be submitted. The inspection may be repeated only after the contractor takes corrective measures; rKAoNiKAca-
SJ20814—2002
c. If the shielding effectiveness, 180° peel strength, adhesion and environmental adaptability are unqualified in the inspection, the inspection shall be stopped, the cause shall be found out and an analysis report shall be submitted. The contractor shall take corrective measures and then conduct the inspection again. 4.4.5 Maintenance of qualification
The contractor shall provide relevant test data every year to prove the validity of its qualification. Table 8 Qualification inspection
Inspection items
Product mark
Appearance quality
Fungus test
High and low temperature test
Wet heat test
Salt spray test
Screen knocking efficiency
Surface lap resistance
180° peel strength
Adhesion
4.5 Quality consistency inspection
4.5.1 Inspection items
Requirements Article number
Inspection method Article number
The items and sequence of quality consistency inspection shall be carried out in accordance with Table 9. 4.5.2 Inspection samples and acceptance criteria
Sample size
Acceptance judgment number
4.5.2.1 Group A inspection
Each batch of products submitted by the contractor shall be subject to Group A inspection. The test samples shall be randomly selected from the products submitted for inspection. The sampling plan shall be determined in accordance with GJB179A and the following provisions. a. Inspection level: Generally, the general inspection level II is adopted: When the sample size must be reduced at the expense of increasing the risk of the ordering party, the special inspection level S-2 may be adopted:
b. The acceptable quality level AQL value is 2.5: c. A single sampling plan is adopted.
4.5.2.2 Group B inspection
SJ20814—2002
Table 9 Quality consistency inspection
Inspection items
Product mark
Appearance quality
Shielding effectiveness
Surface bonding resistance
180° peel strength
Adhesion
High and low temperature test
Wet heat test
Salt spray test
Fungus test
Requirements Article number
Inspection method Article number
Each batch of products submitted by the contractor shall be subject to Group B inspection. The test samples shall be randomly selected from the batches that have passed the Group A inspection. The sampling plan shall be determined in accordance with GJB179A and the following provisions. a. Inspection level is generally inspection level II I. When the sample size must be reduced at the expense of increasing the risk of the ordering party, special inspection level S-2 can be used:
b. The acceptable quality level AQL value is 1.0: c. Single sampling is used.
4.5.2.3 Group C inspection
Group C inspection should be carried out once a year in continuous production: Group C inspection should be carried out once a year in batch production. The test samples should be randomly selected from the batches that have passed the A and B group inspections. The sampling plan is n=2, Ac=0, Re=1. 4.5.2.4 Group D inspection
After formal production, if there are major changes in the process and materials, and it may affect the product performance, Group D inspection should be carried out: Group D inspection should also be carried out when the user requires it. The test samples should be randomly selected from the batches that have passed the AB and C group inspections. The sampling plan is: n=2, Ac=0, Re=1. 4.5.3 Unqualified
4.5.3.1 In the A group inspection, if the number of unqualified samples is greater than the acceptance judgment number, the inspection should be stopped, and the contractor should repair or reject the submitted batch before re-inspection. 4.5.3.2 In the B group inspection, if the number of unqualified samples is greater than the acceptance judgment number, the batch of products is unqualified and the inspection should be stopped. The contractor should take measures to solve the quality problems before re-inspection. 4.5.3.3 In the C group inspection, the same as 4.5.3.2. 4.5.3.4 In the D group inspection, the same as 4.5.3.2. 4.6 Packaging inspection
The inspection of the packaging boxes (or bags), packaging boxes, transportation or storage, and markings of shielding foils should be carried out by randomly selecting two packaging boxes from each batch. If any item does not meet the requirements during the inspection, four packaging boxes will be randomly selected for inspection. If it still does not meet the requirements, the packaging design must be improved until it meets the requirements. 4.7 Inspection method
SJ20814—2002
4.7.1 Product marking, size, appearance quality, packaging Use visual inspection and measuring tools that meet the accuracy requirements to inspect product marking, size, appearance quality, and packaging to verify whether it meets the requirements.
4.7.2 Shielding effectiveness
Test according to the method of Chapter B2 of Appendix B of SJ20524. 4.7.3 Surface lap resistance
Press the foil tightly against the cleaned metal surface and test it with a multimeter. Test method: Place the two ends of the multimeter probe on the metal surface and the foil surface respectively. The measured resistance is the surface lap resistance. 4.7.4180° peel strength
Test according to GB2792.
4.7.5 Adhesion retention
Test according to GB4851.
4.7.6High and low temperature storage test
Test according to GJB150.3, GJB150.4.
4.7.7Wet heat test
Test according to GJB150.9.
4.7.8Salt spray test
Test according to GJB150.11.
4.7.9Book fungus test
Test according to GJB150.10.
5Delivery preparation
5.1Packaging
The shielding foil should be neatly and tightly rolled on a paper tube core with a diameter of not less than 70mm and packaged in a plastic bag. 5.2 Packing
The packing box should be firm, reliable and moisture-proof. Each packing box can only contain shielding foils of the same model and specification. Each roll of shielding foil in the packing box should be padded with partition paper on the top and bottom and left and right. The packing box should contain the certificate of conformity, packing list, etc. 5.3 Transportation and storage
5.3.1 Transportation
The packing box containing shielding foil should be able to be transported by any means of transportation. It should be handled with care during transportation and should not be mixed with volatile solvents.
5.3.2 Storage
Shielding foil should be stored indoors. The storage environment should be: -20℃～60℃, relative humidity: 5%～95%, and the surrounding environment should be free of harmful gases such as acid and alkaline.
The storage period should generally not exceed 3 years. If it exceeds 3 years, it should be re-inspected according to this specification. 8
5.4 Marking
The marking on the packaging box should meet the following requirements: SJ20814-—2002
8. The outside of the packaging box should be marked with: the name, model specification, quantity, production batch number, trademark, name of the manufacturing unit, manufacturing date, etc. of the shielding foil: bzxz.net
b. The outside of the packaging box should be marked with "fragile items", "stacking weight limit", "afraid of moisture", "afraid of heat", etc. in accordance with GB191:
c. The logo should not change color or fall off due to natural conditions and transportation conditions; d. Unless otherwise specified in the contract or order, all text on the packaging box, except numbers and models, should generally be Chinese characters;. ． The logo should be in two mutually perpendicular and eye-catching positions of the packaging box and should be on the same horizontal line. 6 Notes
6.1 Instructions for use
The magnetic shielding box sheet specified in this specification is a high magnetic permeability material. After the high magnetic permeability material is bent, the magnetic permeability will decrease. Therefore, be careful not to fold it when using it.
6.2 Contents of order documents
The following contents shall be stated in the contract and order:a. Name and number of this specification:
b. Product name, model and specifications:
Quantity:
Special requirements such as packaging, transportation, etc.
Additional instructions:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the Thirty-third Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Bi Haiying, Li Yankui, Wang Qing, Fan Yi, Ma Fuhua. Project code: B88002.
FKAONiKAca
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.