GB/T 1 2006.2 - 2009 is a part of the series of standards for polyamide plastics, focusing on the determination of water content of polyamide. The standard clarifies the determination principle, specifies the specific test procedures such as the Karl Fischer method, and puts forward requirements for the accuracy and specifications of the test instrument. It also details the collection and preparatory methods of the sample. It provides a unified water content detection standard for polyamide plastic production, processing enterprises and testing institutions, which helps to accurately control the mass of the product and ensure the stable performance of polyamide plastic products in different application scenarios.