This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage and safety of difluoromethane (HFC-32, also referred to as R32) for industrial use. This standard is applicable to the purification of difluoromethane (HFC-32) by using dichloromethane as raw material, reacting with anhydrous hydrogen fluoride under the action of a catalyst using a gas phase method or a liquid phase method. This product is mainly used to replace difluorochloromethane (HCFC-22) with single working fluid or mixed working fluid. Molecular formula: CHF. Relative molecular mass: 52.02 (according to the 2007 international relative atomic mass).
HG/T 4634-2014 Referenced Document
GB 13690 General rule for classification and hazard communication of chemicals
GB 14193 Rules for filling of liquefied gas cylinders
GB/T 10627 Gas analysis--Preparation of calibration gas mixtures--Static volumetric methods
GB/T 191 Packaging.Pictorial marking for handling of goods
GB/T 601 Chemical reagent.Preparations of reference titration solutions*， 2016-10-13 Update
GB/T 603 Preparation of preparations and products used in chemical reagent test methods*， 2023-08-06 Update
GB/T 6681-2003 General rules for sampling gaseous chemical products
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 7376-2008 Determination of micro-amounts of water in industrial fluorinated alkane