Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber sealing ring for
pressure cooker
UDC 643.352:678
.06:621-762
HG2943—1984(1997)
Replaces GB4846--1984
This standard applies to rubber sealing rings for daily aluminum pressure cookers (hereinafter referred to as pot rings) made of rubber as the main raw material and a specific formula.
Structure and specifications
Structure: The structure is shown in Figure 1.
A—Working surface; B—Non-working surface
Specifications: The specifications should comply with the provisions of Table 1.
Basic dimensions
Limit deviation·
Basic dimensions
Limit deviation
Note: In addition to the specifications specified in Table 1, production can be carried out according to the specifications proposed by the user. 2
Technical requirements
Basic dimensions
The pot ring should be non-toxic, odorless, and resistant to heat, edible oil, salt, vinegar, alkali, etc. 2.2 The physical and mechanical properties of the rubber used for the pot ring should comply with the requirements of Table 2. Issued by the National Bureau of Standards on December 27, 1984
Limit deviation
Basic sizebzxz.net
Limit deviation
Implemented on July 1, 1985
HG2943-1984(1997)
Tear strength, kgf/cm2 (MPa)
Tear elongation, %
Tear permanent deformation, %
Hardness (Shore A type), degree
Not less than
Not less than
Not greater than
Heat resistance coefficient (steam aging), gauge pressure 3kgf/cm2 (0.29MPa), 24h not less than edible oil weight change rate, 130℃, 24h, %Indicator
- 3～7
2.3 The pot ring uses water as the medium, and under the steam pressure of 1kgf/cm (0.098MPa), it is used for 8 hours each time, and the parking time does not exceed 24 hours each time, and the cumulative service life is not less than 200 hours. 2.4 The sanitary quality of the pot ring should comply with the provisions of GB4808-1984 "Sanitary Standard for Sealing Rings of Food Pressure Cookers". 2.5 The appearance quality of the pot ring should comply with the provisions of Table 3. Table 3
Test method
Defect name
Trimming traces
Lack of sulfur, sponge
Qualified product requirements
Not allowed on the working surface; allowed on the non-working surface, but the depth shall not exceed 1mm, the area shall not exceed 2mm2, and there shall be no more than 2 non-working surfaces of the entire pot ring. Not allowed on the working surface; allowed on the non-working surface, but the area shall not exceed 2mm2, and there shall be no more than 2 non-working surfaces of the entire pot ring.
Depression shall not exceed 0.3mm, the cumulative diameter of the working surface does not exceed the circumference. The diameter of the card
exceeding the circumference is allowed to be slightly
. The cumulative diameter of the non-working surface is not allowed to be
. The non-working surface is allowed, but the depth and width are not more than 1mm, and the length is not more than 1.5mm. The cross-sectional dimensions of the non-working surface of the entire pot ring should be no more than 2. The measurement is measured with a measuring tool with an accuracy of 0.02mm; the outer diameter is measured with a fixed standard sample. 3.1 The appearance quality of the finished product is checked by the self-viewing method. The preparation of the sample for the physical and mechanical properties test of each batch of pot ring rubber shall be carried out in accordance with the provisions of GB527-1983 "Requirements for Physical Test Methods of Vulcanized Rubber".
The tensile strength, elongation and permanent deformation tests are carried out in accordance with GB5281982 "Determination of tensile properties of vulcanized rubber". 3.4
The hardness test is carried out in accordance with GB531-1983 "Rubber Shore A hardness test method". The heat resistance coefficient test is carried out in accordance with the test method in Appendix A (supplement). The edible oil weight change rate test is carried out in accordance with GB1690-1982 "Vulcanized rubber liquid resistance test method". The sanitation project test is carried out in accordance with the test method of GB4808-1984. 68
4 Inspection rules
HG2943--1984(1997)
4.1 The manufacturer shall designate full-time personnel to conduct inspections in accordance with the provisions of this standard and the relevant provisions of national standards. The manufacturer shall ensure that the products shipped meet the requirements of this standard. Qualified products shall be accompanied by product quality certificates. 4.2 The number of pot rings shall not exceed 50,000 pieces per batch. If the number is less than 50,000 pieces per month, the number shall be one batch per month. The inspection shall be carried out in accordance with the provisions of 4.2.1 and 4.2.2 of this standard.
4.2.1 The physical and mechanical properties of the rubber used for pot rings shall be inspected in accordance with the provisions of 1, 2, 3, and 4 in Table 2 of Article 2.2 of this standard for each batch. If any of the inspection results do not meet the specified indicators, double samples shall be taken for retesting of the unqualified items. If the retest results show that one of the items still does not meet the specified indicators, the batch of rubber is unqualified. 4.2.2 The heat resistance coefficient, edible oil resistance weight change rate and finished product hygienic quality shall be inspected at least once every three months. If any of the inspection results do not meet the specified indicators, double samples shall be taken for retesting of the unqualified items. If the retest results show that one of the items still does not meet the specified indicators, the batch of rubber or finished products is unqualified. 4.3 The appearance quality of finished products shall be 100% inspected in accordance with Article 2.5 of this standard. During random inspection and acceptance, the number of random inspections shall not be less than 5% of the batch. The appearance defect missed detection rate shall not exceed 2% of the number of random inspections as a result of the random inspection, otherwise double the number of finished products shall be sampled for re-inspection. If the appearance defect rate still exceeds 2% of the number of random inspections as a result of the re-inspection, the batch of products shall be 100% reworked by the manufacturer for appearance quality inspection, and can only be shipped after they are qualified. 4.4 The purchaser may inspect the service life of the pot ring in accordance with Article 2.3 of this standard. 4.5 If the inspection results of the supply and demand parties are inconsistent, the two parties may negotiate to resolve the issue. If the issue cannot be resolved, the issue shall be arbitrated by a professional department. 5 Marking, packaging, transportation and storage
5.1 Marking
The packaging should be marked, including the following: a.
Product name and specifications;
Manufacturer name;
Quantity, weight, packaging volume;
Production date;
Batch number;
f. "Food rubber products, keep clean" words. 5.2 Packaging
5.2.1 The pot ring can be packed in cartons, or packed according to the requirements and quantity of the purchaser. 5.2.2 The packaging materials that directly contact the product should meet the requirements of sanitary packaging materials. 5.3 Transportation
This product should be kept away from rain and sun, and iron hooks are prohibited during loading and unloading, and it should be kept clean. 5.4 Storage
5.4.1 The product should be stored in a well-ventilated warehouse, with the warehouse temperature maintained at -10℃~37℃ and the relative humidity not exceeding 85%. 5.4.2 It shall not come into contact with acid, alkali, oil and other substances harmful to rubber or human body to avoid contamination of the product. 5.4.3 The product shall not be heavily pressed. When placed, it shall be at least 20 cm above the ground, 1.5 m away from heat sources, and avoid direct sunlight. 5.5 Under the above storage conditions, the storage period of the pot ring is set at one year. 69
HG2943-1984(1997)
Appendix A
Test method for heat resistance coefficient (water vapor aging) (supplement)
This test is to make the sample under the specified steam pressure for a certain period of time to measure the changes in its physical and mechanical properties. A1 Specimen
The specimen must comply with the relevant provisions of GB528--1982 "Determination of tensile properties of vulcanized rubber". A2 Test equipment
A2.1 The test equipment is a rubber vulcanization tank or a pressure container. A2.2 The test equipment is guaranteed to withstand a steam pressure of not less than 3kgf/cm2 (0.29MPa) and is equipped with a device that can control the steam pressure and ensure safety.
A3 Test steps
A3.1 Test according to the test conditions of item 5 of table 2 of article 2.2 of this standard, or test according to the test conditions negotiated by the supply and demand parties. A3.2 The specimens for the tests before and after aging must be cut from the same sample. A3.3 The number of specimens for each sample shall not be less than 12, and the number of specimens for the tests before and after heat aging shall not be less than 6. A3.4 The specimens shall be hung in the test equipment, and a certain distance shall be maintained between the working parts of the specimens and between the working parts of the specimens and the wall of the vessel. Carry out the steam aging test according to the test conditions of A3.1, and take out the specimens at the specified time. A3.5 The taken specimens shall be placed at room temperature and the drying time shall not be less than 4h. Determine according to GB528-1982 within 96h. The heat aging test result is calculated according to formula (A1):
- steam aging test coefficient;
where K,
02· E2
—Tear strength before aging, kgf/cm2 or MPa; 22—Tear strength after aging, kgf/cm2 or MPa; E1—Tear elongation before aging, %; e2—Tear elongation after aging, %. Additional remarks:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is technically managed by the Shanghai Rubber Products Research Institute. This standard was drafted by Shenyang Rubber Products Factory No. 4. The main drafters of this standard are Wang Wenbo and Tian Xuepu. 70
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