GB/T 12832-2008 uses the Hardness measurement method to determine the crystallization effect of rubber. Rubber crystallization affects its performance, and this standard is of great significance. It specifies the applicable rubber types and details the principle of using Hardness changes to reflect the crystallization effect. Specifies the selection and calibrating requirements of hardness testing instruments, and standardizes the preparation process of rubber samples. Hardness measurement operations at different temperatures and times are strictly regulated, covering details such as measurement point selection and loading force control. Through system measurement and data processing, the rubber crystallization effect is accurately evaluated, which helps the mass control of rubber products and the adaptation of application scenarios.