Gb T 21255 2019 Translated English Of Chinese Standard Gbt 21255 2019 Gb T21255 2019 Gbt21255 2019

This Part of GB/T 20671 specifies the principle, instruments and apparatuses, test samples, test procedures, test reports and precision of the method for determining the degree of influence on the physical properties of nonmetallic gasket materials after immersion in the test liquid. This Part applies to the determination of the liquid resistance of Type 1, Type 2, Type 3 and Type 7 materials which are described in GB/T 20671.1-2020.

This Standard specifies the classification, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of rubber antioxidant - polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (hereinafter referred to as rubber antioxidant TMQ).

This Standard specifies the structural style, technical requirements, test methods, inspection rules, marking, painting, packaging, transportation, and storage of low temperature valve.

This Standard specifies the test method of mercury removal rate for activated carbon mercury removal catalyst. This Standard is applicable to activated carbon mercury removal catalyst that takes activated carbon as carrier; elemental sulfur, sulfide and metal oxide as active components, that is mainly used for removing mercury from natural gas, synthesis gas, refinery gas and industrial tail gas.

This Standard specifies procedures for using rectangular coordinates and polar coordinates to establish the front, back, and three-dimensional wafer coordinate systems. This Standard applies to the establishment of wafer coordinate systems with and without pattern. The coordinate system is used to determine and record the exact locations of test results such as defects and particles on the wafer.

This Standard specifies product classification, technical requirements, test methods, inspection rules, marking, package, transportation, storage, quality certificate, and ordering form (or contract) contents of platinum ingots. This Standard is applicable to the platinum ingots produced by the platinum-contained raw materials.

This Standard specifies requirements for sampling, determination method and test report of steel decarburization. This Standard is applicable to measuring depths of decarburization of steel (blank) and its parts. The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

This Standard specifies the technical requirements for spectacle frames, the selection of test samples, sample pretreatment and requirements, testing, inspection and compliance, test methods, and marking. This Standard applies to various types and styles of spectacle frames made of metal, plastic, and natural organic materials, including rimless mounts, semirimless mounts, and folding spectacle frames.