The DIN 52351-1956 standard details the determination methods for moisture content, water-absorption and Film thickness expansion of wood fiberboard. The standard provides key test procedures for quality control and performance evaluation of wood fiberboard, including how to accurately measure the moisture content of wood fiberboard, water-absorption energy and the rate of change of Film thickness after water absorption. These tests are essential for evaluating the stability and durability of wood fiberboard under different environment conditions.