This document details the classification and marking, requirements, test methods, inspection rules, as well as signs, Encasement, transportation and storage of diatomaceous earth used in painting materials for construction interiors. It applies to diatomaceous earth used in painting materials. In this document, diatomaceous earth is divided into two types: calcined diatomaceous earth and washed diatomaceous earth. Calcined diatomaceous earth is diatomaceous earth used for painting materials after calcination process treatment, while washed diatomaceous earth is diatomaceous earth used for painting materials after washing process treatment. Moisture absorption is defined as the amount of mass increase over a certain period of time when a unit mass of material is placed in an air environment with a certain temperature and Humidity.