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See Chinese contents: GB/T 20671.3-2020 GB/T 20671.3-2020: Classification system and test methods for nonmetallic gasket materials -- Part 3: Standard test method for fluid resistance of gasket materials
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.
