GB/T 5720-2008Test methods for rubber O-rings (English PDF)

Foreword

This standard replaces 5720-1993 "O-shaped rubber O-ring test method" GB/T.

This standard and GB/T 5720-1993 The main differences are.

--- Remove A "O-shaped rubber seal standard sample" Appendix;

--- Increasing the low temperature performance test;

--- Remove tensile set measurement;

--- The length of the test liquid resistant O-ring fragment sample from (90 ± 2) mm to at least 50mm;

--- 5.4.1.2 bar will "height limiter is 75% Sample-sectional diameter" to "the hardness of the sample (10 ~ 80) IRHD time, Height limiter 75% cross-sectional diameter of the specimen, the hardness of the sample at the time (81 ~ 89) IRHD, a height limiter for the test Like cross-sectional diameter of 85%, when the hardness of the sample (90 ~ 95) IRHD, a height limiter for the sample cross-sectional diameter 90%. ";

--- Increase the corrosion resistance of the sample and the jig and the result of the determination shown icon.

The standard proposed by China Petroleum and Chemical Industry Association.

1 Scope

This standard specifies the solid vulcanized rubber O-ring dimensional measurement, hardness, tensile properties, the hot air aging, constant compression deformation Permanent deformation, corrosion test, resistance to liquid, density, shrinkage, and low temperature test Test Method for Compressive stress relaxation.

This standard applies to solid vulcanized rubber O-ring (hereinafter referred to as O-rings).

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 528-1998 vulcanized rubber or thermoplastic rubber tensile stress strain properties (eqv ISO 37:1994)

GB/T 533-1991 vulcanized rubber or thermoplastic rubber measured density (ISO 2781:2007, IDT)

GB/T 1690-1992 Test method for liquid-resistant vulcanized rubber (neq ISO 1817)

GB/T 2941-2006 rubber physical test method for preparing and conditioning General procedures (ISO 23529:2004, IDT)

GB/T 3452.2-2007 hydraulic and pneumatic rubber O-rings - Part 2: appearance quality inspection standard (ISO 3601-3:2005, IDT)

GB/T 3512-2001 vulcanized rubber or thermoplastic rubber hot air and heat accelerated aging test (eqv ISO 188:1998)

GB/T 6031-1998 Determination of vulcanized rubber or thermoplastic rubber hardness (10 ~ 100IRHD) (idt ISO 48:1994)

GB/T 7758-2002 vulcanized rubber low temperature performance measured temperature retraction procedure (TR test) (ISO 2927:1997, IDT)

GB/T 7759-1996 vulcanized rubber, thermoplastic rubber at room temperature, high and low temperature compression set measurement (eqv ISO 815:1991)

GB/T 13643-1992 Rubber, vulcanized or thermoplastic Determination of compression stress relaxation (cyclic sample) (eqv ISO 6059:1987)

HG/T 2369-1992 Rubber Plastic tensile testing machine technical conditions

3 Sample Requirements and test conditions

4 Measuring sample size

Measuring the sample size should be GB/T 2941-2006 the provisions of Chapter 7 conducted a cross-sectional diameter measured by the method A, using an inner diameter Method D measurement.