GB/T 27563-2011 N-Methyl-2-Pyrrolidone for industrial use

GB/T 6283-2008 Chemical products—Determination of water Karl·fischer method(general method) GB/T 9724-2007 Chemical reagent—General rule for the determination of pH GB/T 9725-2007 Chemical reagent—General rule for potentiometric titration GB/T 325.1-2008 Packing containers—Steel drums—Part 1:General specifications GB/T 325.1-2018 Packaging containers—Steel drums—Part 1:General specifications GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 3143-1982 Color determination method of liquid chemicals (Hazen unit—platinum-cobalt scale) GB/T 6488-1986 Test method for refractive index of chemical products GB/T 6488-2008 Liquid chemicals—Determination of refrative index at 20℃ GB/T 6488-2022 Liquid chemicals—Determination of refractive index GB/T 6678-2003 General principles for sampling chemical products GB/T 6680-2003 General rules for sampling liquid chemical products GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 9722-2006 Chemical reagent—General rules for the gas chromatography GB/T 9722-2023 Chemical reagent—General rules for the gas chromatography