O-Ring Material Characteristics
EPR/EPDM – Ethylenne Propylene
Excellent compression set and resistance, limited temperature range.
USE
Water/steam, acetone, diluted acids and caustics, ketones.
AVOID
Mineral Oil, solvents, aromatic HC
FKM – Fluoroelastomer/fluorocarbon (Viton®)
Excellent high-temperature resistance with good chemical resistance and compression set properties.
USE
Mineral oils, some acids and bases, HC, loa concentration H2S.
AVOID
Amines, ketones, steam and selected acids, water above 200° F.
FEPM – Fluorinated Ethylene Propylene (Fluoraz®, AFLAS®)
Excellent heat and chemical resistance.
USE
Water/steam, mineral oils, thermal oils, hydraulic fluids, H2S up to 35%, amines, radiation.
AVOID
Aromatic hydrocarbons, chlorinated HD, ketones, acetone.
FFKM – Perfluoroelastomer (Kalrex®, Chemraz®, Isolast®)
Most extensive heat and chemical resistance.
USE
Water/steam, mineral oils, hydraulic fluids, harsh chemicals.
AVOID
Perfluorinated solvents and alkali metals.