HG/T 2021-1991 High temperature resistant lubricating oil O-ring rubber sealing materials
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG 2021—91
High temperature resistant lubricating oil O-shaped rubber sealing ring materials
Published on June 27, 1991
Ministry of Chemical Industry of the People's Republic of China
Implementation on December 1, 1991
Chemical Industry Standard of the People's Republic of China
High temperature resistant lubricating oil Q-shaped rubber sealing ring materials
1 Subject content and applicable scope
HG 2021 —91
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of high temperature resistant lubricating oil O-shaped rubber sealing ring materials.
This standard applies to O-shaped rubber seal materials for high temperature resistant lubricating oil (hereinafter referred to as materials) 2 Reference standards
GB528 Determination of tensile properties of vulcanized rubber
GB 531
Rubber Shore A hardness test method
GB1682 Test method for brittle temperature of vulcanized rubber GB 1690
GB 2828
Test method for liquid resistance of vulcanized rubber
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) GB 3452. 1
Dimension series and tolerance of O-shaped rubber seals for hydraulic and pneumatic use O-shaped rubber seals appearance quality inspection standard GB 3452. 2
GB 3512
Rubber hot air aging test method
Standard method for retention test of O-shaped rubber seals
GB 5720
GB $721
GB 5722
GB5723
GB 6031
GB 6032
General rules for marking, packaging and transportation of rubber sealing productsGeneral rules for storage of rubber sealing products
General rules for measurement of dimensions of test pieces and products for testing vulcanized core rubberDetermination of the international hardness of vulcanized rubber (30~85IRHD)Determination of the international whip strength of vulcanized rubber (30~85IRHD)Conventional test methodsWww.bzxZ.net
Micro test methods
GBT759Determination of permanent deformation of vulcanized rubber under constant deformation and compression at room temperature and high temperature3 Classification
3.1 Materials are divided into two categories, I and II, according to different media. Category I: Nitrile rubber is used as a substitute, suitable for Petroleum-based lubricating oil, the working temperature is generally -25 ~ +125C, short-term 150, Class II: represented by low compression deformation oxygen rubber, mainly suitable for synthetic acid lubricating oil, the working temperature is generally -15 ~ +200℃, short-term 250.3.2 Preferred nominal hardness grade of materials: Class is 60.70, 80, 88IRHD; Class II is 60, 70, 80, 88IRHD3.3 Use letters and numbers to mark material properties, namely "type, basic physical properties, standard guide", example:
Ministry of Chemical Industry of the People's Republic of China 1991-06-27 Approved 1991-12-01 Implementation
HG 2021—91
HG 2021—91
Standard number
“Maximum compression deformation
Minimum elongation at break
Minimum tensile strength
Hardness value
High temperature lubricating oil O-shaped rubber sealing ring materials can be marked with “basic physical properties” when the material and standard number are known. 4 Technical requirements
High temperature lubricating oil O-shaped rubber sealing ring materials, the raw materials and manufacturing processes used shall comply with relevant technical specifications: the materials shall all 4. 1
4.2 The physical properties of the material (vulcanized rubber) shall comply with the requirements specified in Table 1 and Table 2, Table! Physical properties of Class I materials
Hardness, IRHD
Tensile strength, MPa
Elongation at break, %
Compression set (125×22h), %
In 1# standard oil (150×70 h)
Change in hardness, IRHD
Volume change, %
Hot air aging (125℃×70h)
Change in hardness, IRHD
Change in tensile strength, %
Change in elongation at break, %
Warm resistance. -25 13
Note: 1) If lower low-temperature brittleness is required. Can be agreed upon by the enzyme supplier and the enzyme supplier, HI·6463
-5~+10
HI 454
-5~+10
-8 ~ +6
HI 8434
80 ± 5
-5~+10
HI9423
-5-+10
0～10
Hardness, IRHD
Tensile strength, MPa
Elongation at break, %
Compression set (200×22 h). %
HG 2021 -91
Physical property requirements for Class II materials
HⅡ 6445
60 ± 5
101 standard oil (the mass ratio of diisooctyl sebacate and phenpyrimidine is 99.5 : 0.5). (200 × 70 h)Hardness change, IRHD
Volume change, %
Hot air aging (250×70h)
Hardness change, IRHD
Tensile strength change, %
Elongation at break change, %
Low-temperature brittleness, -15℃1
Note: 1) If the low temperature is lower, it can be agreed upon by the supplier and the belt. Maximum
-10-+5
0～+20
-5~+10
4.30 The appearance quality of the O-ring shall conform to the relevant provisions of GB3452.2, referring to
-10~+5
0→+20
-5~+10
HI8424
-10~+5
.0～+20
-5~+10
4.40 The size and tolerance of the O-ring shall conform to the relevant provisions of GB3452.1 or the requirements agreed upon by the supplier and the supplier. 5 Test method
5.1 Test specimen
5 1.1 The standard O-ring shall be used as the test specimen in priority. HI 9423
88 ± 4
-10~+5
-5~+10
5.1.2 The same batch of rubber materials of this product can also be used to prepare vulcanized test specimens with equivalent vulcanization degree (B-type test specimens for compression deformation), and the corresponding national standard physical test methods are adopted. The results represent the performance of the product. The test results of O-shaped products and vulcanized test specimens cannot be compared.
5.2 Physical properties
5.2.1 The strength measurement of O-rings shall be carried out in accordance with GB5720, and the test pieces shall be carried out in accordance with GB531 or GB6031 or GB6032. In arbitration, GB6031 or GB6032 shall be followed.5.2.2 The tensile strength and elongation at break of O-rings shall be measured in accordance with GB5720, and the test pieces shall be measured in accordance with GB 528 Compression set determination of O-rings shall be carried out in accordance with GB5720, and the test pieces shall be carried out in accordance with GB7759. 5. 2. 3
Liquid resistance test of O-rings shall be carried out in accordance with GB5720, and the test pieces shall be carried out in accordance with GB1690. 5.2.5 Hot air aging test of O-rings shall be carried out in accordance with GB5720, and the test pieces shall be carried out in accordance with GB3512. 5.2.6 Low temperature brittleness test of test pieces shall be carried out in accordance with GB1682. 5.3 Appearance quality
5. 3. 1 Appearance quality inspection shall be carried out by visual inspection and measuring tools with a graduation value of 0. 01 mm or 0. 02 m in accordance with the method of GB 5723.
5.4 Dimension tolerance
5. 4, 1 Dimension and tolerance measurement, within the range of 160 mm, use a pan with an accuracy of 0. 01 mm or 0. 02 mm; 3
HG 2021 — 91
For sizes larger than 160-400mm, use a gauge with a graduation value of 0.02mm or 0.05mm; for sizes larger than 400mm, use a gauge with a graduation value of 0.05mm or 0.1mm, and conduct the test in accordance with the method of GB5723. 6 Inspection rules
6.1 O-rings manufactured with the same formula and the same process method shall be batched in batches of no more than 1,000 or 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 inspected in accordance with the provisions of GB2828, using the general inspection level II (sample J or L; sample F within a batch of 150 pieces), with an AQL value of 4. 6.4 The physical properties of each batch of materials shall be inspected before delivery according to the requirements of Items 1 to 5 in Table 1 or Items 1 to 5 in Table 2. 6.5 When any of the following situations occurs, all technical requirements specified in this standard shall be inspected: i.e. type inspection, conversion of new and old products, and trial production and finalization identification; b.
After formal production, if there are major changes in materials, structures, and processes that may affect product performance: During normal production, after a certain amount of production is accumulated regularly, an inspection should be carried out periodically; When production is resumed after a long period of suspension;
When the factory inspection result is significantly different from the last type inspection: t. When the national quality supervision department proposes the requirement of type inspection. 6.6 When the size inspection result of the material is unqualified, it is a defective product: When the appearance quality inspection result of the O-ring material is unqualified, it is allowed to be repaired once and then inspected again. If it is still unqualified, it is a defective product: When the physical property inspection of the material is unqualified, double the sample should be dared to inspect the unqualified items (the rubber material can be repaired once, but the full performance inspection should be carried out). If there is still one unqualified item, it is a defective product.
Marking, packaging, transportation, storage
7.1 The marking, packaging and transportation of materials shall be carried out in accordance with GB 5721. 7.2 The storage of materials shall be carried out in accordance with GB5722. 7.3 Under the conditions of complying with Articles 7.1 and 7.2, the storage period of the O-ring material is one year from the date of manufacture, and the storage period of the Class I material is five years; the storage period of the rubber material is 6 months. Products that exceed the above storage period shall be used only after passing type inspection. Additional notes:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China, and is under the jurisdiction of the Rubber Sealing Products Standardization Technical Management Unit of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, and the main drafters of this standard were Su Guirong and Li Rushan. This standard is formulated with reference to the U.S. military standard MIL-R-83248-87. Chemical Industry Standard of the People's Republic of China. Oil-resistant D-shaped rubber sealing ring material HG 2021 91. Editorial Department of Chemical Industry Standards (Institute of Standardization, Ministry of Chemical Industry) Postal Code: 100013. Standardization Institute, Ministry of Chemical Industry. Copyright reserved. Printing and publication 880 × 1230 1 / 16. Printing sheet 34. Words 8000. First edition December 1991. First printing December 1991. Printing number 1 500. Book fee 1.20 yuan. 2021 -91
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