????????????????????????????????????????????30?????????????????????????????????????????????????????????????PROPERTY
REQUIREMENT OF ELASTOMERIC RINGS ??1. Profile of Ring : As per
enclosed drawing2. Nominal cut Length : As per enclosed drawing3.
Material : EPDM (Ethylene Propylene Rubber)4. Properties (as per IS
5382 - 1985)No Property Requirement 1. Visual Inspection Free from
cut cracks, porosity, air bubbles 2. Hardness 46 - 55 Shore 3.
Tensile strength (Minimum) 11 MPa 4. Elongation at break (Minimum)
400% 5. Compression Set a) For 24 +0 to -2 h @ 701(c 25% max b) For
72 +0 to -2 h @ 272(c 12% max 6. Water immersion change in volume @
70(c for 7 days 8% max 7. Water Absorption 10 max 8. Accelerated
Ageing @ 70(c For 7 days a) Change in Hardness -5 to +8 b) Change
in Tensile strength (20% c) Change in Elongation to break -30 to
+10% d) Stress Relaxation 18% Note: Properties have to be checked
in accordance with IS-5382 or equivalent ASTM
standard.????????????????????????????????????????????????????????????????
