1 Subject content and applicable scope
This standard specifies the classification, technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of O-ring rubber materials for vacuum system.
This standard is applicable to those O-ring rubber material used in vacuum system.
2 Normative references
GB 528 Rubber, vulcanized — Determination of the tensile properties
GB 531 Shore A Hardness Test Method of Vulcanized Rudder
GB/T 533 Rubber, vulcanized — Determination of density
GB/T 1682 Rubber, vulcanized — Determination of the brittleness temperature
GB/T 1690 Rubber, vulcanized — Determination of the effect of liquids
GB/T 2828 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
GB 3452.1 Fluid power systems — O-rings — Inside diameters, cross-sections, tolerances and size identification code
GB 3452.2 Fluid power systems — O-rings — Quality acceptance criteria
GB 3512 Rubber, vulcanized — Accelerated ageing or heat-resistance test — Air-oven method
GB 5720 Test methods for rubber O rings
GB 5721 General rules of identification, packaging, transportation and storage for rubber sealing products
GB 5722 General rules of storage for rubber sealing products
GB 5723 Rubber, vulcanized — General rules of determination of dimensions of test places and products for test purposes
GB 6031 Rubber, vulcanized — Determination of international hardness (hardness between 30 IRHD and 85 IRHD) — Routine test methods
GB 6032 Rubber, vulcanized — Determination of international hardness (hardness between 30 IRHD and 85 IRHD) — Mini-typr test methods
GB 7759 Rubber, vulcanized — Determination of compression set at ambient elevated or low temperatures
GB 9865 Rubber, vulcanized — Preparation of samples and test pieces
3 Classification
The rubber material is divided into Categories A and B according to the volume of gas released under vacuum.
3.1 Category A
For vacuum degree less than or equal to 10-3 Pa, the service temperature range is generally -60 ~ 250°C, such as silicone rubber.
3.2 Category B
For vacuum degree higher than 10-3 Pa, and according to the heat and oil resistance, it is divided into the following four kinds:
B-1 The service temperature range is generally -50 ~ 80°C, oil resistance is poor, such as natural rubber;
B-2 The service temperature range is generally -50 ~ 80°C, oil resistance is poor is relatively good, such as nitrile rubber;
B-3 The service temperature range is generally -20 ~ 250°C, good oil resistance, such as fluorine rubber;
B-4 The service temperature range is generally -30 ~ 140°C, oil resistance is relatively poor, such as butyl, ethylene propylene rubber.
Foreword i
1 Subject content and applicable scope
2 Normative references
3 Classification
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
Annex A Determination of gas-out rate of vulcanized rubber at normal temperature (Informative)
