The main differences between the T/GBMA002-2020 standard for heavy calcium carbonate used in the plastic industry and HG/T3249.3-2013 are as follows:

——Added relevant terms and definitions;

——Cancel the classification of product grades for different models;

——Cancel the indicators and measurement methods for activity level;

——Added a method for measuring contact angle;

——Added a method for determining magnesium content;

——Added indicators and measurement methods for moisture content;

——Added indicators and detection methods for insoluble substances in hydrochloric acid;

——Adjusted the heavy metal element content index;

——Adjusted some indicators in the technical requirements;

——Adjusted the inspection rules.