GB/T 3398.2-2008 is the second part of the plastic Hardness Determination Standard, focusing on the determination of rockwell hardness. Plastics are widely used in various industries, and their rockwell hardness affects product performance and use scenarios. The standard clearly applies to plastic types and describes the principle of rockwell hardness testing in detail. It puts forward requirements for the model selection and accuracy brate of the test instrument, and standardizes the size and Smoothness of the sample preparation. Strictly stipulates the test process, such as loading force level, loading and unloading operation, reading time, etc. And gives the calculation of rockwell hardness value and the method of representation of the result, which provides a criterion for accurately evaluating the rockwell hardness of plastics, and helps plastic quality control and application development.