The large number of thread and coupling seals require a variety of materials for seals. Elastomeric seals are common for this purpose. These include:
FKM/FPM (Viton)
Chemical properties
Good general chemical resistance
good ozone & weathering resistance
Physical properties
High temperature resistance
at water & water vapour max. 60°C
operating temperature -20° – +200°C
NBR (Perbunan)
Chemical properties
Good resistance to petroleum & fuel
limited ozone & weathering resistance
Physical properties
Good mechanical properties (abrasion resistance)
good low-temperature behaviour
temperature range -50° – +110°C
Polyurethane (VULKOLLAN)
Chemical properties
Good resistance to petroleum & fuel
poor chemical resistance
Physical properties
Good mechanical strength (wear & tear resistance, elasticity)
operating temperature -40° – +110°C
PTFE (Teflon)
Chemical properties
Universal chemical resistance
good ozone & weathering resistance
Physical properties
Good anti-friction properties
high temperature resistance
operating range -40° – +250°C
CSM (Hypalon)
Chemical properties
Good acid & lye resistance
good resistance to petroleum & fuel
Physical properties
Good mechanical strength (wear & tear resistance, elasticity)
operating temperature -35° – +140°C
FFKM (Kalrez)
Chemical properties
excellent chemical resistance
Physical properties
High temperature resistance
operating range -25° – +225°C
Novapress Multi
Chemical properties
Good steam & hot-water resistance
good resistance to petroleum & fuel
Physical properties
High pressure resistance
operating range -25° – +250°C
EPDM
Chemical properties
Good steam & hot-water resistance
poor resistance to petroleum & fuel
good ozone & weathering resistance
Physical properties
Good mechanical strength (wear & tear resistance)
operating temperature -50° – +180°C
Depending on the particular application, a suitable sealant mus t also be used in addition to the suitable valve material. Plea se contact the manufacturer of the safety fittings for assistance in choosing an appropriate seal.