Elastomer Selection Guide

For Butterfly or Pinch Valves

Ethylene Propylene Rubber (EPDM)    (-20° F to 250° F)
Most effective for applications involving water, steam or diluted acids.

Viton (FKM)    (0° F to 350° F)
Resists solvents, halogenated hydrocarbons, oxygen, weather, ozone, oils, and chemicals.

Buna N (NBR)    (-20° F to 212° F)
Resistant to kerosene, moderate chemicals, fats, oils, grease, and many hydrocarbons.

Natural Rubber (NR)    (-65° F to 180° F)
Good abrasion resistance, tensile strength, and resiliency. Also suitable when dealing with organic acids, alcohols, ketones, and most moderate chemicals.

Hypalon (CSM)    (-20° F to 250° F)
Resists strong acids and bases, ozone, weathering, heat, and oxidizing chemicals.

Butyl (CIIR)    (-20° F to 250° F)
Good resistance to animal and vegetable fats, strong and oxidizing chemicals, oils, heat, and greases.

Neoprene (CR)    (-20° F to 200° F)
Generally resistant to oil and grease, moderate chemicals, fats, many hydrocarbons, and ozone. Resistant to barnacle growth.

Silicone    (-160° F to 500° F)
Resistant to extreme temperatures while still maintaining its useful properties. Non-reactive, flame retardant, and good chemical stability.

Teflon PTFE    (-20° F to 212° F)
Resistant to reactive and corrosive chemicals. Has one of the lowest coefficients of friction of any solid and is hydrophobic, neither water nor water-based substances wet PTFE.

Gum Rubber    (-65° F to 180° F)
Resistant to most acids, salt, ammonia, and alkalis chemicals. Highly resilient to water, abrasion resistant, and large stretch ratio.