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Chemical Industry Standard of the People's Republic of China
HG2181-91
O-ring rubber materials for acid and alkali
1991-12-23 Issued
Ministry of Chemical Industry of the People's Republic of China
Standard Exchange Network mbsocm Various Standard Industry Materials Free Download 1992-05-01 Implementation
Chemical Industry Standard of the People's Republic of China
O-ring rubber materials for acid and alkali
1 Subject content and scope of application
HG2181-91
This standard specifies the code, classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage requirements,
This standard applies to general sulphuric acid, hydrochloric acid, nitric acid resistant O-ring rubber materials Acid, sodium hydroxide O-ring rubber material, 2 reference standards
Determination of tensile properties of vulcanized rubber
Rubber Shore A hardness test method
GB1682
GB1690
GB2828
Test method for brittle temperature of vulcanized rubber
Test method for liquid resistance of vulcanized rubber
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB3452.1
GB3512
GB5720
GB5721
GB5722
GB5723
GB6031
GB6032
GB7535
GB7759
3 Code
Dimension series and tolerance of O-rings for hydraulic and pneumatic use Quality inspection standard for appearance of O-rings Test method for hot air aging of rubber
Standard method for testing O-rings
General provisions for marking, packaging and transportation of rubber sealing products General provisions for storage of rubber sealing products
General provisions for dimensional measurement of test pieces and products for vulcanized rubber testing 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 Classification of vulcanized rubber Description of the classification system
Determination of the permanent deformation of compression of vulcanized rubber at room temperature and high temperature - The first letter of the mark indicates acid and alkali resistant O-ring Rubber materials The following letter is the second letter of the mark, indicating the type of rubber: F
Fluororubber
Chlorosulfonated polyethylene rubber or its blended rubber E-
Ethylene rubber or its blended rubber
Butyl rubber or its blended rubber
Chloroprene rubber or its blended rubber
Styrene-butadiene rubber or its blended rubber
Natural rubber or its blended rubber
Approved by the Ministry of Chemical Industry of the People's Republic of China on December 23, 1991
Implementation on May 1, 1992
4 Classification
HG2181-91
4.1 Grouping: The rubber materials specified in this standard are divided into two groups, A and B, according to the concentration and temperature of acid and alkali resistance. Group A materials are divided into four hardness grades: 40, 50, 60, 70IRHD; Group B materials are divided into two hardness grades: 60, 70IRHD.4.2 Marking: Mark with "purpose, rubber type, basic physical properties, manufacturing unit, standard number. The basic physical property code is in accordance with GB7535.
Example:
HG2181
Standard number
Manufacturing unit code (represented by two Chinese pinyin letters) Compression permanent deformation, maximum value 50%www.bzxz.net
Elongation at break, minimum value 400%
-Tensile strength, minimum value 10MPa
Hardness value range, 40+ degrees
Natural rubber or its blended rubber
Acid and alkali resistant O-ring rubber material
Mark with the rubber type that accounts for the larger proportion in the blended rubber. If the two rubbers account for half each , then the first one shall be marked according to the arrangement order of the rubber code in Chapter 3.
5 Technical requirements
5.1 The raw materials used in the manufacture of rubber materials and their manufacturing process shall comply with the relevant technical specifications. 5.2 The rubber material shall be mixed evenly, and no rubber agglomerates or impurities larger than 0.2mm are allowed. The appearance quality of the O-ring shall comply with the provisions of GB3452.2. The size and tolerance of the O-ring shall comply with the provisions of GB3452.1 or the drawings. 5.3 The physical properties of the rubber material shall comply with the provisions of Table 1 or Table 2. 6 Test methods
6.1 The appearance quality of the material shall be inspected visually or measured with a measuring tool with an accuracy of 0.02mm. 6.2 The size measurement of the O-ring shall be carried out in accordance with GB5723. 6.3.1 The test specimen shall be an O-ring as much as possible. If it is not possible or inconvenient to use an O-ring for testing, the same batch of O-rings produced shall be used. Rubber. Prepare standard test pieces with the same degree of vulcanization as the O-ring. 6.3.2 Hardness measurement shall be carried out in accordance with GB6031 or GB6032 or GB531. GB6031 or GB6032 method shall be used in arbitration.
6.3.3 Determination of tensile strength and elongation at break shall be carried out in accordance with GB528, 2
Standard Control Network ba80so.ccm Guest American Standard Industry Data Free Download Items
Hardness, IRHD or Shore A
Tensile strength, minimum
Elongation at break, minimum
HG2181-91
Table 1 Physical property requirements of group A rubber materials
CA44732)
Compression permanent deformation, 70℃×22h25%, maximum heat resistance 70℃×70hl)
Hardness change| |tt||Change in tensile strength
Change in elongation at break
20% sulfuric acid 23℃×6.d
Change in hardness
Change in tensile strength
Change in elongation at break
Volume change
20% hydrochloric acid 23℃×6
Change in hardness
Change in tensile strength
Change in elongation at break
Volume change
20% sodium hydroxide 23℃×6d
Hardness change
Tensile strength change
Tear elongation change
Volume change
Low temperature brittleness (-30℃)
Note: 1) 100℃, % can also be used according to the selected rubber type
2) The symbol 4 represents the missing second letter, that is, the rubber type (see Chapter 3). C454732)
CA63552)
Standards obtained from the network w.baeocomCA73432
Hardness, IRHD or Buer A
Tensile strength, minimum
Elongation at break, minimum
HG2181-91
Table 2 Physical properties requirements of rubber materials in group B
CA6254
Shrinkage permanent deformation 125℃×22h\, 25%, maximum, heat resistance 125℃×70h
Hardness change
Tensile strength change
Elongation at break change
40% sulfuric acid 70℃×6d
Hardness change
Tensile strength Change in hardness
Change in elongation at break
Change in volume
20% hydrochloric acid 70℃×6d
Change in hardness
Change in tensile strength
Change in elongation at break
Change in volume
40% nitric acid 23×6d
Change in hardness
Change in tensile strength
Change in elongation at break
Change in volume
40% sodium hydrofluoride 70℃×6d
Change in hardness
Change in tensile strength
Change in elongation at break
Change in volume
Low-temperature brittleness (-30℃）
Note: 1) For fluororubber, 200℃ can be used. %
2) The symbol A indicates the second missing letter, i.e. the type of rubber (see Chapter 3). 6.3.4 Determination of compression set. According to GB7759. Use type B test specimen. 6.3.5 Hot air aging test. According to GB3512. Standard exchange network mba8osoccm Various standard industry materials free download teaching no cracking
CA7334
6.3.6 Acid resistance test. According to GB1690 HG2181-91
6.3.7 Determination of low temperature performance. According to GB1682 6.3.80 Performance test of ring. According to GB5720. 7 Inspection rules
7.1 Rubber
7.1.1 Rubber produced by the same shift and the same machine is a batch. 7.1.2. The appearance of the rubber material should be inspected batch by batch. 7.1.3 Take one roll of each batch of rubber material for basic physical property inspection; according to the acid or alkali environment in which the O-ring is located, acid or alkali resistance test should be carried out for the corresponding acid or alkali. At least once a month, heat aging resistance and low temperature brittleness should be inspected at least once a quarter. 7.1.4 When there are unqualified inspection items, double samples should be taken for re-inspection of the unqualified items. If one item is still unqualified after the re-inspection, the rubber material of the roller is unqualified, and the rubber material should be inspected one by one. 7.20 Ring
1.2.1 Unless otherwise specified, products of the same specification made of the same rubber number and delivered for inspection at one time are one inspection batch. 7.2.20 Ring appearance quality should be inspected piece by piece. 7.2.3 Dimensional tolerance, according to GB2828, adopt general inspection level II, AQL value 4 for sampling inspection 8 Marking, packaging, transportation, storage
8.1 The marking, packaging, transportation of rubber materials shall be in accordance with GB·5721 or agreed upon by the supply and demand parties. 8.2 Storage of rubber materials shall be in accordance with GB5722. 8.3 In compliance with 8.1 and 8.2, the storage period of rubber materials is three months or six months from the date of manufacture. Rubber materials that exceed the storage period shall be inspected and qualified according to the requirements of this standard before they can be used. The storage period of O-rings produced from natural rubber, styrene-butadiene rubber, chloroprene rubber or their combination is 2 or 3 years; the storage period of O-rings produced from butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, fluororubber or their combination is 5 or 7 years. Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the rubber sealing products standardization technical unit of the Ministry of Chemical Industry. This standard is drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Jingru and Shen Lequn. All kinds of standard industry information can be downloaded for free from the standard exchange website a.b2808o0.00n. The People's Republic of China
Chemical Industry Standards
Acid and Alkali O-Ring Rubber Materials
HG2181—91
Editor: Chemical Industry Standards Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printer: Standardization Research Institute of the Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format: 880×12301/16 Number of words on a sheet: 10000 First edition in November 1992
First printing in November 1992
Number of copies! —500
Standard Portable Network mm.bz00.ccm16-
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