What is ASTM D575 91 standard test methods for rubber properties in compression?

ASTM D575-91 is a standard test method for evaluating the compression properties of rubber materials, entitled "Standard Test Methods for Rubber Properties in Compression". However, it is important to note that, as far as I know, as of 2021, ASTM standards may be updated and revised. Therefore, it is recommended that you consult the latest edition of the ASTM D575 standard to ensure the most accurate and up-to-date test methods.

According to the ASTM D575-91 standard, the following is a general overview of this test method:

1. Sample preparation: Prepare representative samples from rubber products. The shape and size of the sample should meet the requirements specified in the standard.

1. Test equipment: Use a special compression testing machine for testing. The compression testing machine should meet the requirements specified in the standard and ensure that parallel and uniform compressive forces can be applied.

1. Compression test: The sample is placed between the compression fixtures of the testing machine, and the compression force is applied at a predetermined speed. During the test, the compressive deformation of the sample and the applied compressive force shall be recorded.

1. Calculation of compressive modulus of elasticity: Calculate the compressive modulus of elasticity of the sample based on the test data. The compressive modulus of elasticity is the rate of change of strain of a material under a specific compressive stress.

1. Compression set: within a certain period of time, record the deformation of the sample under constant compressive stress to evaluate the compression set performance of the rubber material.

1. Results record and report: record test data, and prepare test report according to the requirements in the standard.

Note that this is only an overview of the ASTM D575-91 standard test method. To ensure that the test is performed correctly and accurate results are obtained, please read and follow the latest edition of the ASTM D575 standard.