What is the Compression set ?
Polypedia > Properties of polymers > Physical properties
Compression set | |
The most important property of rubber subject to compression loads is the modulus of elasticity. For soft rubber it varies between 1 and 10 MPa, while for hard rubber it is around 1000MPa. The modulus of elasticity depends on the temperature of the rubber, the time that the rubber has been at the test temperature, the degree of deformation, and the composition and curing of the rubber. The rubber does not have sufficient volumetric compressibility to allow its use as a compression spring; can only be used as a spring, when the lateral expansion is not obstructed Test procedure: The thickness of the original sample is measured. The sample is placed between the spacers and the compression device. The sample is compressed to 25% of its original height, using spacers to measure compression accurately. Within two hours of assembly, the compression device is placed in an oven at a specific temperature for 22 hours and 70 hours. 30 minutes before measuring the final thickness. Sample size: There are 2 sizes of cylindrical disc samples: Type 1 The thickness is 12.5 mm +/- 0.5 mm Type 2 The thickness is 6.0 mm +/- 0.2 mm The principle on which they are based is the execution of tests with deformations imposed on the samples and the predetermined environmental conditions, to evaluate the elastic return at the end of the test. The percentage value of compression deformation is obtained by the following expression: Cs = (h iniziale-h finale) / (h iniziale - h compressa)% | |
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