Some standard content:
Chemical Industry Standard of the People's Republic of China
Material of rubber seals wsed forgas supply pipes and fittingsUC678.4.03 - 47
: 66.073.3
HG/T 3092 - 1988 (1997)
Replaces GB 9878 ~ 88
This standard is equivalent to the international standard ISO64471983 "Elliptical rubber seals for gas supply pipes and pipe fittings - 1 Subject content and scope of application
Material specification
This standard specifies the performance requirements and test methods of rubber seals for gas (natural gas or artificial gas) supply pipes and fittings with working humidity below 50°C. It also specifies some general requirements for seal products. This standard is applicable to cast iron, steel, copper and plastic pipe seals. This standard does not apply to seals made of foam rubber or seals containing closed-cell space structures. 2 Reference standards GB 528 Determination of tensile properties of vulcanized rubber GB 531 GB 1682 GB 1683 GB 1685 GB 1690 GRB 2941 Test method for rubber Gunnar A hardness test method for vulcanized rubber brittle temperature test method for vulcanized rubber Determination of permanent deformation of vulcanized rubber under constant deformation compression Determination of compression stress relaxation of vulcanized rubber at room temperature and high temperature Test method for vulcanized rubber body test standard temperature, humidity and time for parking and testing of rubber specimens GB 3452.2 O-ring rubber seal appearance quality inspection standard GB 3512 GB 3672 GB 5721
Test method for hot air aging of rubber
Dimensional tolerances of solid molded and extruded rubber productsGeneral provisions for marking, packaging and transportation of rubber sealing products GB5722, General provisions for storage of rubber sealing products GB 5723
GB 6031
CB 6032
GB 7529
3 Grading
General provisions for dimensional measurement of test pieces and products for testing vulcanized rubberDetermination of the international hardness of vulcanized rubber (30~85IRHD)Conventional test methodDetermination of the international hardness of vulcanized rubber (30~85IRHD)Micro test methodGeneral provisions for appearance quality of molded and extruded rubber productsThe rubber compounds and products specified in this standard are divided into five grades according to hardness, and the corresponding preferred nominal hardnesses are 50, 60, 70, 80 and 88IRHD or degrees respectively.
4 Technical requirements
4.1 Materials and processes
4.1.1 The raw materials used to make the rubber compound shall meet the requirements of the relevant technical specifications. Approved by the Ministry of Chemical Industry of the People's Republic of China on May 19, 1988 and implemented on May 1, 1989
. 55 *
HG/T 3092-1988 (1997)
4.1.2 The substances contained in the rubber compound shall not be harmful to the performance of the gas being transported, the transmission pipeline, accessories and sealing rings. 4.1.3 The processing technology of the rubber compound shall meet the requirements of the relevant technical specifications. There shall be no visible rubber lumps and impurities larger than 0.2mm in the rubber compound.
4.2 Performance requirements
The physical properties of the vulcanized rubber or sealing ring products used to manufacture sealing rings shall comply with the requirements of the following table: 4.3 General requirements for sealing ring products
Performance requirements for rubber sealing ring compounds
Tensile strength, minimum
Elongation at break, minimum
Compression permanent change:
After 70h at standard room temperature, maximum
After 22h at 70C, maximum
After aging in air at 70C for 7d:
Hardness change, maximum
Tensile strength change, maximum
Elongation at break change, maximum
Compression stress relaxation:
After 7d at standard room temperature. Maximum
After 90℃ at standard room temperature, maximum 2
Liquid B immersion
After 7d at standard room temperature:
Hardness change, maximum
Volume change, maximum
After immersion for 7d and then drying in 70C air for 4d: Volume change
"Low brittleness"
Test temperature is selected according to the use conditions or transportation conditions of the sealing environment:
15℃, ~25℃ or -40℃
IRHD or degrees
IRHD or degrees
IRHD or degrees
- 25 - 1d
56 ~65
25 + 10 - 25 -- + 19 : 30 -- - 1015
Note: 1) The requirements for 80 and 8 grade rubber materials are only applicable when the material directly acts as a seal. 2) This is an optional test and is only required when the test is signed or the user explicitly emphasizes it. 4.3.1 Workmanship quality
The specimen has no cracks
85--91
40 -- + 10
The processing technology of the sealing ring shall comply with the relevant technical specifications, and the sealing product shall be free of pores, cracks and other defects that affect its use function.
4.3.2 Dimensional tolerance
The dimensional tolerance of the sealing ring product shall be negotiated by the supply and demand parties and selected from the appropriate level specified in (B3672. ·56
HGT3092-1988(1997)
4.3.3 Marking, packaging, transportation and storage
If the size is uniform, the letter "G" indicating its use shall be on the sealing ring or packaging. The marking, packaging and transportation shall comply with (1357 21, the storage of sealing rings shall comply with the provisions of C135722. 5 Test methods
5.1 Appearance inspection
The appearance of the rubber compound shall be visually inspected. The appearance inspection of the sealing ring products shall be carried out in accordance with (3452.2 and GB7529; the size of the products shall be determined in accordance with GB5723.bzxz.net
5.2 Physical property test
5.2.1 Test specimens
The test specimens shall be cut from the sealing ring products as far as possible. If the products are too small to be cut from them, the same batch of rubber compound as that used to produce the sealing rings shall be used to vulcanize suitable test specimens using process conditions equivalent to those used to produce the sealing rings. 5,2,2 Test method
5.2.2.1 Hardness
Hardness shall be measured according to GB6031, GB6032 or GR531. 5.2.2.2 Tensile strength and elongation at break
Tensile strength and elongation at break shall be measured according to GB528 method, using type 2 dumbbell test piece. 5.2.2.3 Compression permanent deformation2
Compression permanent deformation at room temperature and high temperature shall be measured according to CB1683 method, using type B test piece. 5.2.2.4 Hot air aging
Hardness, tensile strength and elongation at break after hot air aging shall be measured according to GB3512 method. 5.2.2.5 Compression stress relaxation
Compression stress relaxation shall be measured according to GB1685 method, using type IⅡ test piece. 5.2.2.6 Volume change and hardness change of the body
The volume change and hardness change of the body shall be measured according to GB1690 method. 5.2.2.7 Low temperature brittleness
Low temperature brittleness should be measured according to GB 1682 method. 6 Inspection rules
6.1 The same type of rubber produced by the same shift and the same machine is a batch. 6.2 The rubber should be inspected for appearance on a roll by roll basis.
6.3 Take one roll from each batch and conduct basic physical properties and liquid resistance tests. 6.4 The hot air aging, low temperature brittleness and compressive stress relaxation of the rubber should be sampled at least once every quarter. 6.5 When the test result is unqualified, double the sample should be taken for retesting the unqualified items. If the retest is unqualified, the rubber material is allowed to be reconditioned once, and the full performance test must be carried out after the reconditioning. If one of the items is still unqualified, the rubber material of the roller is unqualified. At the same time, the rubber material should be inspected roller by roller.
The inspection of the sampling items should also be handled in the same way. Instructions for use:
1) The international hardness test disk method has not yet been popularized, and this standard allows the use of the Shore A type crushing measurement method. However, the hardness index, tolerance, and measurement value change range remain unchanged. 2) The determination of compression permanent deformation under -5, there is no corresponding national standard, so this standard does not specify the low-pressure compression permanent deformation index for the time being. If the user particularly emphasizes, it can be implemented in accordance with ISO1653 "Vulcanized rubber-Determination of compression permanent deformation under constant temperature and constant bending). 57
7 Marking, packaging, transportation, storage
HG/T 3092-1988 (1997)
7.1 Each batch of rubber should be accompanied by a certificate of conformity, which should indicate: technical standard number, rubber code, number, production unit (or code), manufacturing date, and stamped with the inspection department's seal.
7.2 The rubber should be packaged with non-damaging, non-polluting, opaque materials and packed in suitable packaging boxes. The weight of each box shall not exceed 50kgga
7.3 During transportation, the rubber should not come into contact with corrosive substances, greases, acids, alkalis and other substances that are detrimental to rubber. Avoid direct sunlight and rain and snow.
7.4 The rubber should be stored in a cool, dry, clean and properly ventilated environment. It is not allowed to come into contact with acids, greases, chemicals and organic solvents.
7.5 The rubber should be stored in an environment with a temperature of 0-28°C and a relative humidity of no more than 80%. The rubber should not be piled too high, at least 30 cm from the ground and 1 m away from the heat source.
7.6 Under the above conditions, the storage period of the rubber is three months, calculated from the date of manufacture. The rubber that exceeds the storage period should be retested for all performance items in accordance with the specific requirements specified in the table, and can only be used after passing the test. Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is submitted by the Northwest Rubber Industry Products Research Institute, the technical unit responsible for the standardization of rubber sealing products of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute. The main drafter of this standard is Huang Zuchang.
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