GB/T 20671.1-2020 Translated English of Chinese Standard. (GBT 20671.1-2020, GB/T20671.1-2020, GBT20671.1-2020): Classification system and test methods for nonmetallic gasket materials - Part 1: Standard classification system for nonmetallic gasket materialshttps://www.chinesestandard.net, 24 okt. 2020 - 18 sidor This Part of GB/T 20671 specifies the classification method, code definition, thickness requirements and measurement methods, sampling and sample adjustment of nonmetallic gasket materials. This Part applies to materials which are made of asbestos, cork, cellulose and other inorganic or organic materials combined with various adhesives or impregnant. It does not apply to rubber product materials, gasket coating materials or multilayer composite gasket materials; but the surface layer single-layer material of the multilayer composite gasket material is also suitable for this classification system. |
Innehåll
Foreword | 5 |
Classification method | 6 |
Code definition | 8 |
Thickness requirements and measurement methods | 14 |
Sampling | 15 |
Appendix A Informative Applicable test method | 17 |
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accordance with GB/T Adjust the sample anhydrous calcium chloride basic characteristics carbon fiber cellulose chloride and cool chloroprene Classification system closed container code for example code to represent contains anhydrous calcium cool to 21 cork desiccator that contains determined in accordance engineering drawing fiber L3 follow note fourth code gasket materials GB/T graphite immersion in IRM impregnated Class IRM 903 oil isoprene mass increase rate Material model maximum 30 Maximum volume change measured in accordance methods for nonmetallic Minimum volume nitrile rubber nominal thickness nonmetallic gasket materials oven at 100 polytetrafluoroethylene pressure head rate after immersion rate of immersion represents the basic rubber L9 Sample adjustment second code six-digit basic code six-digit code Standard test method supplementary characteristics supplementary documents supplementary technical documents system and test Tensile strength test method GB/T test of GB/T thermal conductivity thickness increase rate thickness tolerance third code transfer the sample Weight gain rate