The TAPPI T 822 standard specifies a test method for the annular compressive strength (rigid support method) of Cardboard to evaluate the edge compressive performance of Cardboard. This method is suitable for Cardboard with a thickness between 0.280.61mm. The compression test of the annular specimen is carried out by placing the annular specimen in a rigid support device. The annular compressive strength is closely related to the lateral compressive strength of Cardboard and is an important indicator of the compressive ability of Cardboard during transportation and Encasement. This standard is widely used in the paper and Encasement industries. It can be used for quality control, product development and raw material evaluation to help optimize Cardboard performance and ensure its Reliability in practical applications.