This standard specifies two methods for the determination of black spots and discolored spots in powdered flame retardant raw materials for modified plastics. --Method A: Wet sieving method, suitable for sticky powder flame retardants;
——Method B: Dry sieving method, suitable for non-sticky powder flame retardants. This standard is applicable to the determination of black spots and discolored spots in powder flame retardants for modified plastics.
HG/T 4670-2014 Referenced Document
GB/T 6003.1 Test sieves—Technical requirements and testing—Part 1:Test sieves of metal wire cloth*， 2022-10-12 Update
HG/T 4670-2014 history
2014HG/T 4670-2014 Determination of black speck and impurity in flame retardant for plastic modification