IS 638 covers rubber sheets in various compounds and hardnesses for general engineering use — gasket cutting, tank lining, vibration isolation, packing, and conveyor skirting. Specifies properties by rubber type (NR, SBR, EPDM, neoprene, nitrile, silicone) and hardness grade (40-80 Shore A).
Specification for sheet rubber of natural and synthetic rubber for general engineering applications including gaskets, lining, and packing.
Key Values
NR 60 Shore A tensileMin 10 MPa
EPDM 60 Shore A tensileMin 7 MPa
Neoprene 60 Shore A tensileMin 8 MPa
Practical Notes
! NR (natural rubber) for general purpose, best resilience. EPDM for water/steam/ozone. Neoprene for oil/weather. Nitrile for fuel/petroleum.
! Always specify rubber TYPE and HARDNESS — both affect performance.
! 60 Shore A is the most common hardness for gaskets and general use.
! Store rubber sheets flat, away from sunlight, ozone, and heat sources.