GB/T 23967-2017 Trimellitic anhydride for industrial use

GB/T 23967-2009 Trimellitic anhydride for industrial use

GB/T 6324.7-2014 Test method of organic chemical products—Part 7:Determination of molten color GB/T 191-2000 Packaging—Pictorial marking for handling of goods GB/T 191-2008 Packaging—Pictorial marking for handling of goods GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 603-2002 Chemical reagent—Preparations of reagent solutions for use in test methods GB/T 603-2023 Chemical reagent—Preparations of reagent solutions for use in test methods GB/T 3723-1999 Sampling of chemical products for industrial use—Safety in sampling GB/T 6678-2003 General principles for sampling chemical products GB/T 6679-2003 General rules for sampling solid 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 16631-1996 General rules for analytical methods of liquid column chromatography GB/T 16631-2008 General rules for high performance liquid chromatography GB/T 191-2025 Graphical symbols marking for handling and storage of packages