The ISO 5630-1:1991 standard specifies a dry heat treatment method for paper and Cardboard at 105 ° C for accelerated aging testing. This method evaluates the performance change of paper during long-term use by simulating a high temperature environment. It is suitable for most paper and Cardboard, but not for high-purity insulating paper (such as paper for electrical equipment). During the test, the sample is treated in a 105 ° C thermostatic box for a certain period of time, and then the aging degree is evaluated by relevant performance tests (such as strength, Color change, etc.). This standard provides a uniform aging test method for the paper industry, which helps to predict the service life and durability of paper.