HG/T 2813-1996 Cork and rubber sealing products. Part 2: For motor vehicles
Some standard content:
HG/T2813—1996
This standard is formulated based on the US military specification MIL-C—6183B—B1 "Aromatic hydrocarbon fuel and lubricating oil resistant gasket soft technology and rubber composite rubber sheet" and combined with the requirements of the domestic motor vehicle industry. Under the general title of "Cork and rubber sealing products", it includes the following two parts: Part 1 (HG/T2812) for transformers and high-voltage electrical appliances; Part 2 (i.e. HG/T2813) for motor vehicles. This standard is an independent part under the general title "Cork and rubber sealing products". This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. This standard was funded by Shaanxi Qianxian Rubber Factory and co-drafted by the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry, Kunshan Rainbow Composite Materials Co., Ltd. and Henan Neixiang Fengshen Rubber Cork Co., Ltd. The main drafters of this standard are Zhu Haifeng, Li Zongqi, Cao Yuanli, Zhu Zhen and Chen Yuxiang. 25
|1 Scope
Chemical Industry Standard of the People's Republic of China
Cork and rubber sealing products
Part 2: For motor vehicles
HG /T 2813—1996
This standard specifies the requirements, sampling, test methods, marking, labeling, packaging, transportation and storage of cork and rubber cavity sealing products for motor vehicles.
This standard applies to static sealing cork rubber products used in motor vehicles such as automobiles, tractors, locomotives, motorcycles, etc. under a tightening force of 23MPa and -40~+120 awns. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T531-92 Test method for Nal A hardness of vulcanized rubber (neg ISO7619:1986) GB/T 533-91 Determination of density of vulcanized rubber (eg vISo 2781:198g) GB/T 1690-92 Test method for liquid resistance of vulcanized rubber (neg ISO 1817:1985) GB/T2828-87 Procedure and sampling table for counting sample of batch inspection (applicable to inspection of continuous batches) GB/T3512-83 (89) Rubber hot air aging test method (ne ISO188:1976) GB/T5721-93 General provisions for marking, packaging, transportation and storage of rubber sealing products GB/T7759-87 Determination of permanent deformation of vulcanized rubber under constant deformation compression at room temperature and humidity (neg ISO 815:1972)
GB9865-88Preparation of vulcanized rubber samples and test specimens (negISO4661/1:1986)HG/T2812-1996Cork rubber sealing products Part 1: For transformers and high-voltage electrical appliances 3 Requirements
3.1 Materials
Cork particles should be clean, free of impurities, soft and elastic. Rubber and its compounding agents should conform to the provisions of relevant national standards or industry standards.
3.2 Physical properties
Physical properties are shown in Table 1,
Approved by the Ministry of Chemical Industry of the People's Republic of China on June 28, 1996 and implemented on January 1, 1997
Density, maximum, Mg/m
Compression, %
Recovery, minimum, %
Tensile strength, minimum, MPa
Hardness. Nar A type, degree
HG / T 2813 - 1996
Physical properties
Hot air compression permanent deformation, compression 23%, 70℃ × 22 h, max. %Color change, degree
Hot air aging, 100℃ × 70h
Attached 1# standard oil, 100 × 70 hbZxz.net
Water resistance, volume change, 100c × 1 h, %Volatile standard oil B, 23t x24h
Temperature, not higher than, B
3.3 Oil resistance test
Weight change, %
Prying index F, max.
Hardness change. Skin
Volume change. %
Compressibility
Hardness change. Degree
Volume change, %
Compressibility
After the sample is subjected to the oil resistance test as specified in Table 1, its surface should not be sticky. 3.4 Dimensions and tolerances
3,4.1 Dimensions
20 ± 5
80 ± 10
-10~+10
-5~+10
No crack
-10~+15
0~ +60
No acid crack
The maximum width of the plate is 915 mm, the thickness is 1 mm~12 mm, and the length is determined by negotiation between the supply and demand parties. Profile dimensions are based on the requirements of the purchaser.
3.4.2 Tolerance
3. 4. 2. 1 Thickness
The thickness tolerance of the product is ±0.30mm, and the thickness deviation of different points of a single product is 0.25mm. Special tolerances can be negotiated and determined by the supply and demand parties.
3.4. 2. 2 Plate size tolerance
Unless otherwise specified, the plate width tolerance is ±6.35mm and the length tolerance is ±1%.28
3. 5 Manufacturing quality
HG / T 2813 —1996
The surface of the product should be clean and smooth, and no defects that are harmful to the assembly and performance of the parts are allowed. 4 Sampling
4.1 A batch of rubber materials is no more than 300g produced by the same machine during the shift. Products of the same specification made of the same batch of rubber materials and the same production process conditions shall be manufactured in batches of no more than 5,000 pieces. 4.2 Product appearance and dimension inspection shall be carried out by random sampling at the general inspection level II of GB/T2828 with an acceptable quality level (AQL) of 2.5, and inspection shall be carried out in accordance with the requirements of 3.4 and 3.5. 4.3 Inspection classification
4.3.1 Factory inspection
For each batch of products, all rubber materials shall be inspected according to items 2, 3, 4 and 8 in Table 1, which is the factory inspection. 4.3.2 Type inspection: The inspection carried out for all the requirements specified in this standard is the type inspection. Type inspection should be carried out in any of the following circumstances: a) trial production and finalization appraisal of new and old products; b) after formal production, if there are major changes in materials, structure, and process that may affect product performance; during normal production, an autumn inspection shall be carried out at least once every six months; when the product is resumed after being discontinued for three months; when there is a major difference between the factory inspection results and the last type inspection; when the national quality and cost supervision agency proposes a requirement for type inspection. f
4.4 Re-inspection
4.4.1 When the size of the product is unqualified, it is allowed to be repaired once and then inspected. If it is still unqualified, the batch of products is judged as unqualified products; when the appearance quality of the product is unqualified, it is allowed to be repaired once and then inspected. If it is still unqualified, it is a unqualified product. 4.4.2 When the physical property test of the product fails, double the number of samples should be taken to inspect the unqualified items. If there is still one unqualified item, it is a unqualified product.
4.5 Samples
The samples should be taken from the products. If they cannot be made directly from the products, they can be prepared from the same batch of rubber materials as the products using the same vulcanization conditions as the products.
4.6 Test conditions
4.6.1 Standard conditions: Unless otherwise specified, all tests shall be conducted at a temperature of 23±2 and a relative humidity of (50±4)%. 4.6.2 Sample conditioning: Unless otherwise specified, all samples shall be conditioned under standard conditions for at least 46 hours before testing. 4.7 Inspection responsibilities and rejection
4.7.1 The supplier shall complete all inspection requirements specified in this standard and provide the test results to the purchaser in accordance with the specified requirements. The purchaser has the right to conduct inspections when it deems it necessary to ensure that the product quality meets the requirements of this standard. 4.7.2 Any product that does not meet this standard or the requirements agreed upon by the supplier and the supplier may be rejected. If there is a dispute between the two parties, the arbitration unit shall make a ruling.
5 Test method
5.1 The appearance of the product shall be inspected by visual inspection.
5.2 The thickness of the product shall be measured by a thickness gauge with a graduation value of 0.01 mm or a vernier caliper with a graduation value of 0.02 mm. 10 different points shall be measured and the arithmetic mean shall be taken as the measurement result. 5.3 The density shall be tested in accordance with the provisions of GB/T533. 5.4 The compressibility and recovery shall be tested in accordance with the provisions of Appendix A of HG/T2812. 5.5 The tensile strength shall be tested in accordance with the provisions of GB/T528 using type I specimens. 29
HG/T 2813 —1996
5.6 The hardness shall be tested in accordance with the provisions of GB/T531. The measured values of 10 points shall be taken on each specimen, and the arithmetic mean shall be taken as the measurement result.
5.7 Hot air aging shall be tested in accordance with the provisions of GB/T3512. The hardness after aging shall be tested in accordance with the provisions of 5.6. The flexibility index shall be tested in accordance with the provisions of Appendix B of HG/T2812. The weight change after aging (4W) shall be tested with a specimen of size 25.mm×50mm×2.0mm. The weight W shall be weighed before aging. After aging, the weight (Wz) shall be weighed after cooling for 24±1 h at a temperature of 21~30℃ and a relative humidity of 50%~55%. The weighing shall be accurate to 0.001 um. The weight change shall be calculated according to the following formula: AW-
W, the weight before aging, um
W—the weight after aging, um
×100%
5.8 Hot air compression permanent deformation shall be tested in accordance with the provisions of GB/T7759 using a \B\ type specimen. 5.9 Silicone 1# standard oil, water resistance, and volatile standard oil resistance B tests are conducted in accordance with the provisions of GB/T 1690. Compressibility is tested in accordance with the provisions of Appendix A of HG/T2812. 5.10 Brittle temperature is tested in accordance with the provisions of GB/T1682. After impact, the sample is bent 180° along the impact direction around a mandrel 5 times the thickness of the sample. Use a magnifying glass with a magnification of 5 times to observe whether there are cracks, splits, and other damage phenomena in the bonded part of the cork particles. 6 Marking, labeling, packaging, transportation, and storage 6.1 Marking
6.1.1 Product marking The manufacturer's name or enterprise code, product part number, and production date are printed on the surface of the product with oil-resistant and non-toxic materials.
6.1.2 Packaging marking Each package should have a label. If transparent or semi-transparent materials are used for packaging, a separate card should be placed in the packaging bag so that the label can be identified from the outside of the packaging bag without damaging the seal of the packaging bag. The contents of the mark include: a)
Specification code of the product;
Standard name or code;
Production period:
Quantity of products:
Manufacturer's inspection batch number and qualified mark;
Manufacturer's name or its code,
The handwriting of the mark content should be clear, eye-catching and not easy to wear out. 6.1.3 The external markings of the packaging box include: product name, specification, production date, manufacturer name or enterprise code, box size, gross weight and "anti-freezing", "handle with care", etc. 6.2 Labels Each batch of products should be accompanied by a label indicating: technical standard number, product name (or code), batch number, quantity, production unit (or code), manufacturing date, and qualified seal of the inspection department. 3 Packaging Products should be packed in wooden boxes or cartons. The structure and selection of the packaging box should be able to prevent wind and rain and snow from entering the box. The box should be equipped with moisture-proof plastic. The total weight of each package shall not exceed 25kg. 6.4 Transportation and storage shall be in accordance with the provisions of GB/T 5721.
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