About Harboro Rubber Engineering in Rubber      Contents      Introduction      Uses of Rubber      Processing Rubber      Designing With Rubber      Selecting / Specifying Rubber      Quality In Rubber      Rubber Directory      Health & Safety      Measuring Properties          Measuring Properties          Measuring Hardness          Tensile Strength          Elongation          Modulus          Compression Set          Permanent Set (Tensile Set)          Density (Specific Gravity)          Resilience          Chemical Resistance          Fluid Resistance          Weather Resistance          Ozone Resistance          Electrical Properties          Tear Strength          Abrasion Resistance          Electric Strength          Flame Resistance          Low Temperature          Staining          Accelerated Ageing      Glossary of Terms      Request A Copy Contact Information

Permanent Set (Tensile Set)   Property: Permanent Set (Tensile Set) Method of Measurement: A standard test piece of known length is stretched by a stated percentage for a period of time and is then released. After recovery the length is measured and the change in length (i.e. unrecovered length) is expressed as a percenatge of the original length ASTM REFERENCE: D412 BS REFERENCE: BS903 Part A5 ISO REFERENCE: ISO/R2285* * technically equivalent ** identical