GB/T 9914.1 - 2013 is the first part of the series of standards for the test method of reinforced products, focusing on the determination of moisture content. It clarifies the test principle for determining the moisture content of reinforced products, specifies the operation procedures such as drying method in detail, and requires the accuracy of instruments and equipment such as oven and Balance. It also standardizes the selection and preparation of samples. This standard provides a unified method for the production and testing of reinforced products, helps to accurately grasp the moisture content of products, ensures the stability of reinforced product performance, and provides strong support for the mass control and application of products in related industries.