Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber wedges for color television sets
Subject content and scope of application
HG 2296-92
This standard specifies the material classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of rubber wedges for color television picture tubes.
This standard applies to rubber wedges for color television picture tubes and also to rubber products for other similar occasions. 2 Reference standards
GB528. Determination of tensile properties of vulcanized rubberGB531
Test method for Shore A hardness of rubber
GB 1692
Determination method for insulation resistivity of vulcanized rubberGB1695
GB2828
Determination method for power frequency breakdown dielectric strength and withstand voltage of vulcanized rubberBatch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB/T 2941
GB3512
GB3672
GB5721
GB5722
GB6031
GB6032
GB7529
GB7759
GB9865
3 Classification
Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens Test method for hot air aging of rubber
Dimensional tolerances of solid rubber molded and extruded products Marking, packaging and transportation of rubber sealing products General provisions General provisions for storage of rubber sealing products
Determination of the international hardness of vulcanized rubber (30~85IRHD) Conventional test method
Determination of the international hardness of vulcanized rubber (30~85IRHD) Micro test method
General provisions for the appearance quality of molded and extruded rubber products Determination of the permanent deformation of vulcanized rubber under constant deformation compression at room temperature and high temperature Preparation of vulcanized rubber samples and test specimens
3.1 Wedge materials are divided into Class 1 and Class 2 according to temperature resistance grade and dielectric properties, see Table 1 for details. 3.2 Wedge specifications and dimensions shall be in accordance with the provisions of the relevant drawings. 3.3 Use letters and numbers for product marking, namely "type, specification, manufacturing unit, standard number". Example:
HG2296
Standard No.
Manufacturer Code
Length×Height, mm
Rubber wedges for color TV picture tubes Class 1 material Approved by the Ministry of Chemical Industry of the People's Republic of China on June 1, 1992 264
Implemented on October 1, 1993
4 Technical requirements
HG 2296-- 92
The raw materials used for rubber wedges and their manufacturing process shall comply with the requirements of relevant technical specifications. 4.1
4.2 The physical properties of the material (vulcanized rubber) shall comply with the requirements of the following table. ItemwwW.bzxz.Net
Hardness, (IRHD or Shore A)
Tensile strength, MPa
Elongation at break, %
Compression set, Type A specimen (100×22h), %Volume resistivity, a·cm
Breakdown strength, MV/m
Hot air aging
Type 1 material 150℃×5d
Type 2 material 120℃×3d
Flame retardant properties, grade
Hardness change (IRHD or Shore A)
Tensile strength, MPa
Elongation at break, %
4.3 The appearance quality of the rubber wedge shall comply with the relevant provisions of GB7529. 4.4 The dimensional tolerance of the rubber wedge shall comply with the provisions of M3F grade in GB3672. 5 Test methods
5.1 Test specimen
10～+10
The test specimen shall be taken from the product. If it is not possible to cut directly from the product, the standard specimen can be prepared from the same batch of rubber materials used to manufacture the product, using the same vulcanization conditions as the product, and the test report shall be explained. 5.2 Physical properties
Hardness determination shall be carried out in accordance with GB6031, GB6032 (arbitration method) or GB531. 5.2.1
Tensile strength and elongation at break shall be determined in accordance with GB528. Compression permanent deformation determination shall be carried out in accordance with GB7759. 5.2.4 Hot air aging test shall be carried out in accordance with GB3512. 5.2.5
Volume resistivity determination shall be carried out in accordance with GB1692. 5.2.6
Determination of breakdown strength shall be carried out in accordance with GB1695. 5.2.7
Flame retardant performance test shall be carried out in accordance with Appendix A. 5.3 Appearance quality
Appearance quality inspection shall be carried out by visual method and measuring tools with an accuracy of 0.02mm in accordance with the relevant provisions of GB7529. 5.4 Dimensional tolerance
Dimensional tolerance measurement shall be carried out by measuring tools with an accuracy of 0.02mm. 6 Inspection rules
6.1 Factory inspection
6.1.1 The factory inspection items are appearance quality, size, and some physical properties of rubber materials. 6.1.2 The appearance quality of the product shall be inspected piece by piece. When the inspection result is unqualified, it is allowed to be repaired once. If it is still unqualified, it is a defective product.
HG 2296-92
6.1.3 The size of the product and the physical properties of the rubber material shall be inspected by batch. 6.1.3.1 No more than 10,000 rubber wedges or corresponding amount of rubber materials manufactured with the same formula and the same process method shall be considered as one inspection batch. 6.1.3.2 The size of each batch of rubber wedges shall be inspected according to the provisions of GB2828, using the general inspection level I and AQL value of 4. 6.1.3.3 Each batch of rubber materials shall be inspected for six physical properties, including hardness, tensile strength, elongation at break, compression set, volume resistivity and flame retardancy. When any of the items is unqualified, if the sample is prepared from the product, double the sample shall be taken to re-test the unqualified item. If it is still unqualified, the batch of products shall be unqualified; if the sample is a standard sample prepared from the rubber material, the rubber material may be re-tested for the first time and all six physical properties shall be tested. If one of the items is still unqualified, the batch of rubber materials shall be unqualified and the products made from the batch of rubber materials shall be unqualified.
6.2 Type inspection
6.2.1 When the product meets one of the conditions a to f in 6.6.1 of GB1.3 "Guidelines for the Preparation of Product Standards for Standardization Work", the product quality shall be comprehensively assessed, that is, all technical requirements specified in the standard shall be inspected. 6.2.2 During normal production, the electrical breakdown strength and thermal aging performance of rubber materials shall be inspected at least once a quarter. If one of the inspection results is unqualified, it is allowed to be re-inspected according to the two conditions specified in 6.1.3.3. If one of the inspection results is still unqualified, the product of that period shall be considered unqualified. 7 Marking, packaging, transportation, storage
7.1 The marking, packaging and transportation of materials shall be carried out in accordance with GB5721. 7.2 The storage of materials shall be carried out in accordance with GB5722. 7.3 Under the conditions of complying with 7.1 and 7.2, the performance of the product shall comply with the provisions of this standard within a storage period of no more than 3 years from the date of manufacture.
A1 Principle
HG 2296-92
Appendix A
Test method for flame retardant properties of rubber
(Supplement)
Fix one end of the sample and point the other end vertically downward. Apply flame in a prescribed manner to measure the flame time and flameless time of the sample, whether the burning droplets can ignite the absorbent cotton, and whether the flame or flameless combustion spreads to the fixture to evaluate the flame retardant properties of rubber. A2 Sample
A2.1 The sample specifications are 130±3mm in length, 13±0.3mm in width, and 3±0.2mm in thickness. A2.2 Each group of samples consists of 5 pieces.
A2.3 The preparation of the sample shall comply with the provisions of GB9865. A2.4 The adjustment of the sample shall comply with the provisions of GB/T2941. A3 Test equipment and materials
A3.1 Burner: a Bunsen lamp with a tube diameter of 9.5mm and a tube length of 100mm. A3.2 Combustion gas: industrial grade methane or natural gas, liquefied gas, etc. with a heat release rate close to 37J/m. Industrial grade methane must be used for arbitration.
A3.31 A bracket that can hold the sample and can adjust the height as needed. A3.4 and
Stopwatch.
Suitable caliper or other measuring tool for measuring the flame height. Medical absorbent cotton.
The test should be carried out in a three-sided metal wind shield in a fume hood or exhaust room. The ventilation system should be closed during the test. A4i
Test steps
A4.1 Place the sample vertically, with its upper end clamped by the sample clamp for about 6mm and its lower end about 300mm away from the horizontally laid absorbent cotton layer. A4.2.At a distance of about 150 mm from the sample, light the Bunsen burner and adjust the combustion gas flow rate so that the lamp tube produces a yellow flame of about 20 mm in a vertical position. Then open the air valve and adjust it to ensure that the Bunsen burner produces a blue flame of 20 ± 1 mm, as shown in Figure A1. A4.3 Make the center of the top surface of the Bunsen burner tube 10 mm away from the lower end surface of the sample, aim the flame at the center of the sample end, and start timing. If the sample has molten dripping, the Bunsen burner tube can be tilted about 45° on the wide side of the sample to prevent dripping from entering the lamp tube, see Figure A2. 267
Tube length 100
Inner diameter 9.5±0.5
Medical absorbent cotton
HG 2296-92
Medical absorbent cotton
A4.4 After applying the flame for 10 seconds, immediately move the Bunsen burner to 150 mm away and record the flaming burning time of the sample after leaving the fire. A4.5 After the flaming combustion of the sample stops, immediately apply the flame again for 10 seconds, and record the flaming and flameless combustion time of the sample after the flame is removed.
A4.6 During the test, observe whether the burning droplets can ignite the absorbent cotton, and whether the flaming and flameless combustion can burn the holder. A5 Result determination
A5.1 The flame retardant performance of the material is divided into three levels: V-0, V-1, and V-2. According to Table A1, the flame retardant performance level of the material is determined from the test results.
The time of flaming after each flame is applied to each sample, s is not greater than
The total time of flaming after 10 flames are applied to each group of 5 samples, s is not greater than the time of flameless burning after the second flame is applied to each sample, s is not greater than the phenomenon of flaming or flameless burning spreading to the fixture for each sample The phenomenon of the dripping of each sample igniting medical absorbent cotton V-o0
A5.2If one of the five samples in a group does not meet the requirements of the corresponding level in Table A1, another group should be taken for retest. All five samples in the second group should meet the requirements of the corresponding level. A5.3If one of the samples in the second group still does not meet the requirements of the corresponding level in Table A1, the larger number in the two groups should be used as the flame retardant performance level of the material.
HG2296-92
1If the test results exceed the requirements of V-2 level, this method cannot be used to evaluate the flame retardant performance. A5.4
Test report
The test report shall include the following contents:
Industry standard number adopted;
Specimen name and number;
Test conditions;
Flame retardant performance level;
Test date, tester and reviewer.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Han Shuyu, Su Guirong and Le Guiqiang. 269
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