This Standard stipulates the structural features, technical requirements and test methods of nickel alloy self-lubricated bearing material. This Standard is applicable to nickel alloy self-lubricated bearing material.

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 the test method of activity for palladium carbon catalysts. This Standard applies to palladium carbon catalysts of hydrogenation reduction reactions for petrochemical industry, pharmaceutical intermediates, electronics industry, perfume industry, dye industry and other fine chemicals, which takes wood powdered activated carbon as the carrier and palladium as the main active component.

This Standard specifies a method for evaluating the grooving corrosion of highfrequency electric resistance welded steel pipes by using the constant potential anodic polarization method in a 3.5% NaCl solution. This Standard is applicable to the test of grooving corrosion for carbon steel high frequency electric resistance welded pipes.

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 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 stipulates the principle, sampling and sample preparation, reagents, instruments, test procedures and test result of test for neutrality of benzole products. This Standard is applicable to test for neutrality of benzole products, such as crude benzole, which is recovered from coke oven gas; coking benzene, coking toluene and coking xylene, which are obtained from light benzene through hydrogenation and rectification; petroleum benzene, petroleum toluene and petroleum mixed xylene, which are produced from petroleum fraction through catalytic reforming process, etc.