This standard was drafted in accordance with the rules provided in GB/T1.1-2009.
The main differences between this standard 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.
