Polymer Type

Usage

Attributes

Natural (NR)

Flapper valves, large pipeline gaskets

Abrasion Resistance

Synthetic Rubber (SBR)

large gaskets

Abrasion Resistance, inexpensive

Buna-N (NBR)

O-rings, valves seats, pump impellers, check balls

Resistance to petroleum solvents

Ethylene-propylene (EPDM)

O-rings, valves seats, flat gaskets, pond liners, check balls

Chemical resistance, inexpensive

Isobutylene Isoprene (IIR)

Diaphragms

Oxidant resistance

Fluorocarbon (FKM)

O-ring, chemical feed pumps

Superior chemical resistance

Neoprene (CR)

Pump impellers, valve seats, chemical feed pumps

Excellent weathering character, resistance to gas and oils

Hyplon (CSM)

Reservoir liners

Ultraviolet resistance

Silastic (Si)

High temperature applications