Some standard content:
HG/T2810—1996
This standard is revised on GB7039—86 according to the domestic production and use conditions and the implementation of GB7039—86
This standard is the first revision of GB 7039--86. The revised technical content mainly has the following changes: two types of O-ring rubber materials in Class A rubber materials have been removed; the test conditions and performance indicators of some items have been adjusted; it is clarified that Class B rubber materials are cast polyurethane rubber materials. From the date of entry into force of this standard, the original GB7039—86 shall be used as the standard. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China, and this standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, the technical unit responsible for rubber sealing products standardization of the Ministry of Chemical Industry. Drafting units of this standard: Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Nanjing Rubber Factory, Yangtze River Hydraulic Parts Factory, Ningguo Seals The main drafters of this standard: Cao Yuanli, Gao Jingru, Zhang Hongshu, Xu Xianzhang, Yan Jiangwei. This standard was first issued in 1986 and revised for the first time in 1994. 1 Scope
Chemical Industry Standard of the People's Republic of China
Reciprocating seal rubber materials!
HG/T 2810—1996
This standard specifies the classification, requirements, sampling, test methods and marking, labeling, packaging and storage of reciprocating seal rubber materials resistant to petroleum-based hydraulic oil and lubricating oil in ordinary hydraulic systems. This standard applies to reciprocating seal rubber materials used in petroleum-based hydraulic oil and lubricating oil in ordinary hydraulic systems. 2 Referenced 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 all valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T529-91 Determination of tear strength of alkali rubber (trouser-shaped, right-angled and crescent-shaped test specimens) (eqvISO34:1979)
GB/T531-92 Test method for Shore A hardness of vulcanized rubber (neqISO7619:1986) GB/T532--89 Determination of adhesion strength of vulcanized rubber to fabric (eqVISO36:1985) GB/T1682-82 (89) Test method for brittle temperature of vulcanized rubber GB/T 1690-92 Test method for liquid resistance of vulcanized rubber (ne9 ISO 1817:1985) GB/T 3512—83 (89) Rubber hot air aging test method (ne9ISO188:1976) GB/T6031-85 Determination of international hardness of vulcanized rubber (30~85IRHD) Conventional test method (eqvISO GB/T 6032-85 Determination of international hardness of vulcanized rubber (30~85IRHD) Micro test method GB/T 7535-87 Classification of vulcanized rubber Classification system description (neg ISO 4632.1: 1982) GB/T 7759-87 Determination of permanent deformation and compression set of vulcanized rubber at room temperature and high temperature (neg ISO 815: 1972) || tt || 3 Classification || tt || 31 The rubber materials for reciprocating seals specified in this standard are divided into two categories: A and B. Type A is nitrile rubber material, which is divided into three hardness levels and five rubber materials with an operating temperature range of -30 to +100°C; Type B is cast polyurethane rubber material, which is divided into four hardness levels and four rubber materials with an operating temperature range of -40 to +80°C. 32 Rubber materials are abbreviated according to "purpose, type, and basic physical property code". The basic physical property code should comply with GB/T 7535,
Example:
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1996-06-28 and implemented on 1997-01-01
4 Requirements
4. 1 Material and process
HG/T 2810 1996
Maximum value of compression set
Minimum value of tensile elongation
Minimum value of tensile strength
Hardness grade
-Class A materials
Reciprocating seals
The raw materials and manufacturing process used in the manufacture of reciprocating seals shall comply with the requirements of relevant technical specifications. 4.2 Physical properties
The physical properties of rubber materials are shown in Table 1 or Table 2. Table 1 Physical properties of Class A rubber materials
Hardness. IRHD or Nar A type.
Tensile strength, minimum, MPa
Tear elongation, minimum, %
Compression set, B-type specimen
100×70Maximum, %
New tear strength, minimum, kN/m
Adhesion strength (25mm). Minimum, kN / mHot air aging 100 × 0h
Hardness change, maximum, IRHD or degree
Tensile strength change rate, maximum, %
Tear elongation change rate, maximum, %
Wave-resistant body 100 × 70 h
#Standard oil
Hardness change IRHD maximum degree
Volume change rate%
3#Standard oil
Hardness change IRD or degree
Volume change rate%
Medullary anodic acid, not higher than,
1.WA9530 is dustproof sealing window rubber material, 2.WA 7453 is coated fabric rubber material.WA 7443
-10~+5
-10~+5
WA B533
-5~+10
-10~+3
-10 ~+5
WA9523
-5~+10
-10 ~ +5
-10~+5
WA9530
-5~+10
-10~+5bzxz.net
-10~+5
WA7453
-5~+10
-10~+5
-10~+5
WSerial number
HG/T2810-1996
Table 2 Physical properties of Class B rubber materials
Hardness, IRHD or Shore A Type, degree
Tensile strength, minimum, MPa
Elongation at break, minimum, %
Compression set, type B specimen
70℃×70h maximum, %
Tear strength, minimum, kN/m
Hot air aging 70×70h
Hardness change. IRHD or degree
Tensile strength change rate, maximum, %
Elongation at break change rate, maximum, %
Liquid resistance 70×70 h
1*Standard oil
Volume change rate, %
3\Standard oil
Volume change rate. %
Brittle temperature, not higher than,
5Sampling
WB6884
60 ±5
-5~+10
WB7874
-5~+t0
W98974
-5~+10
WB9974
-5~+10
The same nitrile rubber material produced by the same shift machine is called a batch with no more than 300k. Casting type polyurethane is called a batch with each reaction sign. 5.1
5.2 An appropriate amount of rubber material should be randomly selected from each batch and the test sample should be prepared according to the specified process conditions. The physical properties of each batch of rubber materials shall be inspected before delivery according to the requirements of 1 to 4 in Table 1 or 1 to 4 in Table 2. 5.3 When any of the following situations occurs, the technical requirements specified in this standard shall be fully inspected: )
The rubber material is transferred to another factory for production;
After formal production, if there are major changes in the formula, materials, and processes; At the end of each month of normal production:
When the rubber material is stopped for more than three months and production is resumed; When there is a significant difference between the factory inspection and the previous inspection; When the national quality preparation agency proposes a requirement for type inspection. 5.4 When the physical property inspection of Class A rubber materials fails, double samples shall be taken for re-inspection of the unqualified items. If the re-inspection still fails, it is allowed to be repaired once. After the repair, a full performance inspection shall be carried out. If there is still one unqualified item, the batch of rubber materials shall be unqualified. When the physical property inspection of Class B rubber materials fails, the products manufactured from the batch of materials shall be unqualified. 5
6Test method
HG / T 2810 -- 1996
6.1 Hardness according to GB/T$31.The test shall be carried out in accordance with GB/T6031 or GB/T6032. During arbitration, the test can only be carried out in accordance with GB/T6031 or GB/T6032. 6.2 Tensile strength and elongation at break shall be tested in accordance with GB/T 528, 6.3 Tear strength shall be tested in accordance with GB/T529 using a right-angled specimen, 6.4 Compression set shall be tested in accordance with GB/T 7759, 6.5 Hot air aging shall be tested in accordance with GB/T3512, 6.6 Liquid resistance shall be tested in accordance with GB/T 6.7 The brittle temperature shall be tested in accordance with GB/T1682. 6.8 The bonding strength between vulcanized rubber and fabric shall be tested in accordance with GB/T532. 7 Marking, labeling, packaging, purchase and storage
7.1 The outer packaging of rubber materials shall be clearly marked, including material code, production date, batch number, manufacturer name, etc. 7.2 Each inner packaging shall be attached with a label, which shall indicate: standard number, rubber code, vulcanization conditions, quantity, qualified mark, manufacturer name, etc.
7.3 The rubber material shall be packed with materials that do not damage or pollute it. The gross weight of each box shall not exceed 25kg. 7.4 The rubber material shall be stored in a cool and ventilated environment. It shall not be allowed to contact with acid, alkali, oil, organic agent, and avoid sunlight. The storage temperature shall not exceed 30, the humidity shall not exceed 80%, and it shall be 1 meter away from the heat source. 7.5 Under the above conditions, the storage period of Class A rubber material is three months from the date of manufacture. Rubber materials that exceed the storage period shall be retested for all items according to Table 1 and can only be used after passing the test.
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