Original standard number GB 7038-1986 HG/T 2579-1994 O-ring rubber materials Part 1: For general hydraulic systems HG/T2579-1994 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
O-ring rubber materials
Part 1: General hydraulic systems
1 Subject content and scope of application
9—94
HG/T 2579
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of O-ring rubber materials for petroleum-based hydraulic oil and lubricating oil (grease) in general hydraulic systems. This standard applies to petroleum-based hydraulic oil and lubricating oil (grease) for ordinary hydraulic systems, and O-ring rubber materials with working temperature ranges of -40 to +100°C and -25 to +125°C respectively.
2 Reference standards
GB/T528 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T 531
Test method for Shore A hardness of vulcanized rubber
GB/T 1682
Test method for brittle temperature of vulcanized rubber
GB/T 1690
Test method for liquid resistance of vulcanized rubber
GB/T 2828°
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) GB/T3452.1
Dimension series and tolerances of O-ring rubber seals for hydraulic and pneumatic use GB/T3452.2 Appearance quality inspection standard for O-ring rubber seals GB/T 3512
GB/T 5720
GB/T 5721
GB/T 5723
GB/T 6031
GB/T 6032
GB/T 7759
Test method for hot air aging of rubber
Test method for shaped rubber sealing ring
General provisions for marking, packaging, transportation and storage of vulcanized rubber or thermoplastic rubber test specimens and product dimensions 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 Determination of the compression set of vulcanized rubber at room temperature and elevated temperature HG/T 2196
Rubber materials for motor vehicles
3 Classification
3.1 The ()-ring rubber materials specified in this standard are divided into two categories: ! and 1. Each category is divided into four hardness grades. Each hardness grade includes two types: qualified products and first-class products. The working temperature range of category 1 is -40 to +100℃, and the working temperature range of category 2 is -25 to 125℃. 3.2 ()-ring materials are marked according to "purpose, type, basic physical properties, and standard number". Approved by the Ministry of Chemical Industry of the People's Republic of China on February 9, 1994 and implemented on January 1, 1995
Example:
HG/T 2579--94
HG/T 2579—94
Standard number
Maximum value of compression permanent deformation
Minimum value of elongation at break
Minimum value of tensile strength
Hardness value
Class I materials for o-rings for hydraulic systems
The marking of ()-ring products shall comply with the provisions of GB/T3452.1. 4 Technical requirements
4.1 The raw materials and manufacturing processes used for ()-ring rubber materials shall comply with the relevant technical specifications. 4.2) The physical properties of o-ring rubber materials shall comply with the requirements specified in Table 1 or Table 2. For the material codes in the table, please refer to HG/T2196. Table 1 Performance requirements for Class I vulcanized rubber
Hardness, IRHD or Shore A·degrees
Tensile strength, MPa
Elongation at break, %
I Compression permanent deformation. Type B specimen
100C x22h.%
Hot air aging, 100℃×70h
Hardness change, degree
Tensile strength reduction rate, %
Not less than
Not less than
Not greater than
Not greater than
Elongation at break reduction rate, %Not greater than
Liquid resistance, 100 (×70h
1"Standard oil
Hardness change. degreewwW.bzxz.Net
Volume change rate, %
3\Standard oil
Hardness change, degree
Volume change rate, %
Brittle temperature. (·Not higher than
Y16364
Qualified product
3~～+8
10～+5
First-class product
—3 ~+7
8~+5
-14~04
-12~0
YI7445
Qualified product
3~+7
8~+5
0+16/0~~+18
-3~+6
6~+5
YI 8435
Qualified product
—3～+6
6～+5
-12～0
10~～+16
0～+14
Note: The hardness results measured by different test methods cannot be compared. The arbitration test must use the international hardness. 23ti
—3～+5
Y19424
Qualified products
First-class products
-3～+6 --3～+5
-6～+5
—5～+5
-10～ 0
0～+12
-12~ 0
0～+12
0~～+16—
Hardness.IRHI) or Shore A degree
Tensile strength.MPa
Elongation at break,%
Compression set.Type B specimen
125 C ×22h. %
Hot air aging: 125 (× 70h
hardness change degree
tensile strength reduction rate, %
not less than
not less than
not greater than
not greater than
not greater than
break elongation reduction rate, %not greater than
liquid resistance, 125C×70h
""standard oil
hardness change degree
volume change rate, %
3"standard oil
hardness change, degree
volume change rate, %
brittle overflow (.not higher than
HG/T 2579—94
Property requirements for class 1 vulcanized rubber
Y16363
Qualified products
5～+10
—15～0
0~ -+ 24
Y17444
Qualified products
5~+8--5~+10
12～0
0～+20
-10～+5
15～0
0~ -+ 22
First-class products
Y18434
Qualified products
First-class products
-- 5-+8
-5～+6
—12～0
0～+18
8~～+-5
-12～0
— 6+5
—10～0
+200~+15
Note: The hardness results measured by different test methods cannot be compared. The arbitration test must use the international hardness. 4.3 The appearance quality of the () ring shall comply with the relevant provisions of N grade and S grade in GB/T3452.2 respectively. 4.4 The size and tolerance of the (shaped ring shall comply with the relevant provisions of GB/T3452.1. 5 Test method
Y19423
Qualified products
--5~+8
First-class products
5～+6
-8～+56～+5
12～0
-10～0
0～+15
5.1 Physical properties
5.1.1 The test specimens shall preferably adopt the standard 0-shaped circle. The product can also be used For the same batch of rubber materials, prepare samples with the same degree of vulcanization.
Hardness test shall be carried out in accordance with GB/T5720, GB/T531 and GB/T6031. 5.1.2
5.1.3Tensile strength and elongation at break shall be carried out in accordance with GB/T5720 or GB/T528. 5.1.4Compression set test shall be carried out in accordance with GB/T5720 or GB/T7759. 5.1.5Liquid resistance test shall be carried out in accordance with GB/T5720 or GB/T1690. 5.1.6 Hot air aging test, in accordance with GB/T5720 or GB/T3512. Low temperature brittleness test, in accordance with GB/T1682. 5.1.7
5.2 Appearance quality and size
5.2.1 () The appearance quality inspection of the ring shall be carried out in accordance with GB/T5723 by visual inspection or measuring tools with a graduation value of 0.02mm. () The size of the ring shall be measured in accordance with GB/T5723. 5. 2. 2
6 Inspection rules
HG/T2579---94
6.1 The same rubber compound produced by the same shift and the same machine shall be a batch of no more than 300kg. The rings of the same specification produced continuously with the same batch of rubber compound and delivered for inspection at one time shall be a batch of no more than 10,000 pieces. 6.2 The appearance quality of () rings shall be inspected piece by piece. 6.3 The size of each batch of () rings shall be sampled and inspected in accordance with GB/T2828, using the general inspection level I and AQI. value of 4. 6.4 The physical properties of each batch of materials shall be inspected before delivery according to the requirements of hardness, tensile strength, elongation at break, and compression set in Table 1 or hardness, tensile strength, elongation at break, and compression set in Table 2. 6.5 When any of the following situations occurs, the technical requirements specified in this standard shall be fully inspected. a.
When the product is transferred to another factory for production or the new product is finalized and identified; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; at the end of each quarter of normal production;
When the product is suspended for more than three months and production is resumed; when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a type inspection requirement. 6.6 When the size inspection results of the product are unqualified, double the sample should be taken for re-inspection. If it is still unqualified, , it is a defective product. When the appearance quality inspection of the product fails, it is a defective product. When the physical property inspection of the material fails, double samples should be taken for re-inspection of the unqualified items (the rubber material is allowed to be retested once, but the full performance inspection should be carried out). If there is still one unqualified item, the batch or period of materials is a defective product.
7 Marking, packaging, transportation, storage
7.1 Unless otherwise specified, the marking, packaging, transportation and storage of materials shall be carried out in accordance with GB/T5721. 7.2 Under the condition of complying with Article 7.1, the storage period of the rubber material shall not exceed half a year; the storage period of the O-ring shall be two years. Additional remarks:
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 Industrial Products Research Institute of the Ministry of Chemical Industry, the technical unit responsible for the standardization of rubber sealing products of the Ministry of Chemical Industry. This standard is drafted by the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baoyong, Su Guirong, Li Lijun and Zhang Mingchao. 238
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