GB/T 9126.1-2023 Non-metallic flat gaskets for pipe flanges Part 1: PN series has been changed from GB/T 9126-2008 Dimensions of non-metallic flat gaskets for pipe flanges.
GB/T 9126.1-2023 Non-metallic flat gaskets for pipe flanges Part 1: PN series has been changed from GB/T 9129-2003 Specifications of Non-metallic flat gaskets for pipe flanges.
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