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

Measuring Hardness   Property: Hardness Method of Measurement Measured in degrees and based on the penetration into the rubber of a definined indentor under a set load. Three scales are commonly used: IRHD (International Rubber Hardness Degrees), Shore A and Shore D for hard materials over 90o Shore A. IRHD is preferred for for most specifications but Shore A is also in widespread use. ASTM REFERENCE D2240 D1415 BS REFERENCE BS 903 Part A26 ISO REFERENCE ISO48* ISO1400* ISO1818* * technically equivalent ** identical