GB/T 2677.2-2011 "Determination of Moisture in Papermaking Raw Materials" specifies the method for determining the moisture content in papermaking raw materials, applicable to various types of papermaking raw materials. The method employs the oven-drying gravimetric technique, where the sample is dried in an oven at 105±2°C until a constant weight is achieved. The moisture content is calculated by weighing the sample before and after drying. The standard outlines requirements for sample collection and preparation, stipulating that each sample must weigh no less than 50g and be tested in duplicate. Allowable error must fall within the specified range, and the average result is taken to ensure accurate and consistent determination of moisture content in papermaking raw materials.