Some standard content:
HG/T2811—1996
This standard adopts the current Japanese Industrial Standard JISB 2402-1976 Oil Seal Chapter 6 and amends GB7040-86 in accordance with national conditions.
The main differences between this revision and Chapter 6 of JISB2402 are: the original properties of rubber materials are added:
- Two types of materials, silicone rubber and fluororubber, are added; - Cold resistance is changed to brittle temperature.
This standard is the first revision of GB7040-86. The revised technical content mainly has the following changes: Two types of materials, acrylic rubber and silicone rubber, are added: The test conditions and performance indicators of some items are adjusted. From the date of entry into force of this standard, the original GB7040-86 shall be invalidated. This standard is proposed by the Technical Supervision 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. The drafting units of this standard are: Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Yichang Zhongnan Rubber Factory, Dongfeng Automobile Seals Factory. The main drafters of this standard are: Wang Baoyong, Wang Wenfu, Hao Fusen, Zhang Xiaolin, Hao Zhiyi, 1
Chemical Industry Standard of the People's Republic of China
Rubber Materials for Lip Seals of Rotating Shafts
HG/ T 2811 --- 1996
This standard specifies the classification, requirements, sampling, test methods, and marking, labeling, packaging, and storage of rubber materials for lip seals of rotating shafts.
This standard applies to rubber materials for latent seals of rotating shafts. 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/T528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T.531-92 Test method for part A hardness of vulcanized rubber (ncqISO7619:1986) GB/T1682--82 (89) Brittleness temperature test for vulcanized rubber Method GB/T1690-92 Test method for liquid resistance of vulcanized rubber (neqISO1817:1985) GB/T3512-83 (89) Test method for hot air aging of rubber (negISO188:1976) GB/T6031-85 Determination of international hardness of vulcanized rubber (30~～85IRHD) Conventional test method (eqVISO481979)
GB/T7535-87 Classification of vulcanized rubber Classification system description (neqISO4632.1:1982) GB/T 7759-~87 Determination of permanent deformation of vulcanized rubber under constant deformation compression at room temperature and elevated temperature (neg ISO 815:1972)
3 Classification
3.1 The rubber materials for lip seals of rotating shafts specified in this standard are divided into four categories: A, B, C and D. Category A is three materials based on nitrile rubber; Category B is a material based on acrylic rubber; Category C is a material based on silicone rubber; Category D is two materials based on chloroform rubber. 3.2 Rubber materials are numbered according to "purpose, type and basic physical property code". The basic physical property code shall comply with the provisions of GB/T·7535
Example:
Approved by the Ministry of Chemical Industry of the People's Republic of China on June 28, 1996 and implemented on January 1, 1997
4 Requirements
4.1 Materials and Process
HG/T 2811—1996
Maximum value of compression permanent deformation
Maximum value of elongation at break
Minimum value of tensile strength
Hardness grade
Class A rubber material for rotary shaft lip seal
The raw materials and manufacturing process used in manufacturing rotary shaft lip seals shall comply with the requirements of relevant technical specifications. 4.2 Physical properties
Physical properties requirements of rubber materials are shown in Table 1 or Table 2. Table 1 Class A and Class B vulcanized rubber properties
Hardness, IRHD Shore A Type, degrees
Tensile strength, minimum, MPa
Elongation at break, minimum, %
Compression set, E type specimen
Maximum, %
Hot air aging
Hardness change, IRHD type A, degrees
Tensile strength change rate, maximum, %
Elongation at break change rate, maximum. %
Liquid resistance
1# standard oil
Volume change rate, %
3# standard oil
Volume change rate, %
Late temperature, not higher than,
XA 7453
70 ±5
100 c × 70 h
100 x70 h
100x70h
-10 ~ +5
0→+25
120c ×70 h
120c ×70h
120c × 70 h
-8 ~+5
0 +25
28111996
Table 2 Properties of C and D vulcanizates
Hardness, IRHD or Nur A type, degrees
Tensile strength, minimum, MPa
Elongation at break, minimum, %
Compression set, B type specimen
200℃, 70h, maximum, %
Hot air aging 200, 70h
Change in hardness. IRHD or Nur A plasticity, degrees
Change in tensile strength, maximum, %
Change in elongation at break, maximum, %
Reduction resistance 150℃, 70h
1# standard oil
Volume change, %
3# standard oil
Volume change. %
Brittle temperature, not higher than,bzxZ.net
sSampling
XC7243
-5~+10
-5 ~+12
XD7433
XD8423
5.1 The same rubber material produced by the same lot and the same machine shall be batched with no more than 300kg. 5.2 One batch shall be randomly selected from each batch of rubber material and the test specimens shall 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 Items 1 to 4 in Table 1 or Items 1 to 4 in Table 2. 5.3 When any of the following situations occurs, a full inspection shall be carried out on the technical requirements specified in this standard: - When the product is transferred to another factory for production or when a new product is finalized for identification; - After formal production, if there are major changes in materials or processes that may affect product performance; - At the end of each quarter of normal production; - When a product is discontinued for more than three months and production is resumed; - When the results of the factory inspection are significantly different from those of the previous type inspection; - When the national quality inspection results ... When the supervisory agency proposes a type inspection requirement, 5.4 When the inspection result is unqualified, double the sample should be taken for re-inspection of the unqualified item. If the re-inspection is still unqualified, the rubber material is allowed to be conditioned once. After conditioning, a full performance test should be carried out. If one of the items is still unqualified, the batch of rubber materials is unqualified. 6 Test method
6.1 Hardness shall be tested in accordance with GB/T531 or GB/T6031. 6.2 Tensile strength and elongation at break shall be tested in accordance with GB/T528. HG/T 2811- 1996
6.3 Constant deformation compression set shall be tested in accordance with GB/T7759. 6.4 Hot air aging test shall be tested in accordance with GB/T3512. 6.5 Low temperature brittleness test shall be tested in accordance with GB/T1682, 6.6 Liquid resistance test shall be tested in accordance with GB/T1690. 7 Marking, labeling, packaging, purchase and storage
7.1 Each batch of materials shall be accompanied by a certificate indicating: material name or code, batch number, mark, quality, manufacturing date, Manufacturer's name and qualified stamp of the manufacturer's inspection department
7.2 Each inner package should be attached with a label, which should indicate the material name or code, batch number, manufacturing date and manufacturer's name. 7.3 Each package should have a clear mark on the outside, indicating: material name or code, factory date and manufacturer's name, in addition, there should be sun protection, moisture-proof and prohibited contact with corrosive substances. 7.4 The rubber material should be packaged with materials that do not damage or pollute the rubber material, and then packed into the packaging box. The weight of each box should not exceed 25kg.The quality of the packaging box should ensure that the material is not damaged during transportation and storage. 7.5 The material should be stored at a temperature of 0-28℃. The relative humidity should not exceed 80%, in a dust-free and properly ventilated environment, at least 1m away from the heat source.
7.6 The material is not allowed to come into contact with acids, alkalis, oils and various solvents during storage, and should be protected from sunlight, arc light, ultraviolet rays and other radiation.
7.7 The storage period of the material should not exceed six months. For materials that exceed the storage period, full performance inspection should be carried out according to Table 1 or Table 2: they can only be used after passing the inspection.
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