GB/T 29286-2012 "Pulp - Determination of water retention value" specifies the method for determining the water retention value of pulp, which is applicable to various types of pulp. The method involves preparing a wet pulp sheet from the pulp sample, subjecting it to centrifugal dewatering, and then measuring the mass of the wet pulp sheet. The water retention value is calculated to reflect the water absorption capacity of the pulp fibers. The standard clearly outlines requirements for sample preparation, centrifugal parameters (rotation speed and time), and weighing accuracy. Parallel determinations must be carried out at least three times, and the average value is taken as the result to ensure reliability. This provides a basis for evaluating pulp performance.