About Harboro Rubber Engineering in Rubber      Contents      Introduction      Uses of Rubber      Processing Rubber      Designing With Rubber      Selecting / Specifying Rubber          Where Do I Start?          Material Selection          Basic Mechanical              Hardness              Typical Tensile Strengths              Tensile Strengths Table              Compression Set              Compression Set Values          Other Mechanical Properties          Electrical Properties          ASTM and BS Framework          Data Chart      Quality In Rubber      Rubber Directory      Health & Safety      Measuring Properties      Glossary of Terms      Request A Copy Contact Information

Compression Set   Many Uses of Rubber are compression applications and it may be necessary to define the maximum compression set taken on by a rubber when under load for a period of time. This is usually expressed as the percentage of the compression which is not recovered within a short time after release (30 minutes in BS 903 pt.A6). Compression set limits should only be specified when necessary and must give the time and temperature as well as the amount of compression to be applied. Typical compression set values are shown below for 24 hours compression at 70°C. The test pieces were compressed to 75% of their original height. Typical Compression Set values camn be found here: Typical Compression Set Values