GB/T 27565-2011 Alkyl ketene dimer for industrial use

GB/T 9725-2007 Chemical reagent—General rule for potentiometric titration 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 617-1988 Chemical reagent General method for the determination of melting range GB/T 617-2006 Chemical reagent—General method for the determination of melting range GB/T 1668-1995 Plasticizers—Determination of acid value and acidity GB/T 1668-2008 Plasticizers—Determination of acid value and acidity GB/T 1676-2008 Determinating the iodine value of plasticizers 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 9722-2006 Chemical reagent—General rules for the gas chromatography GB/T 9722-2023 Chemical reagent—General rules for the gas chromatography