Disc and Cup Material Compatibility Chart

Working

Conditions

(1) Buna-N

or Hycar

(2) Viton^®

or Silicone

(3) Teflon^®

(Check Type)

(Check Type)

• (1) Buna-N standard on all brass valves and Bobby^® valves
• Disc and cup made of Viton^® optionally available
• Disc and/or cup made of Teflon^® available on some models
• Disc made of EPDM available on some Bobby^® valves
• Nitrile rubber (BUNA, NBR), is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. This form of synthetic rubber is generally less resistant to oil, solvents, and acids; but offers excellent resistance to water and abraision. However (like natural rubber), it can be attacked by ozone, aromatic hydrocarbons, ketones, esters and aldehydes.

• (2) Stainless steel valves standard with disc and cup made of Viton^®
• R1350, R1360, R1370, R1380, RM292 Series
• Viton® is a brand of synthetic rubber and fluoropolymer elastomer (FKM). This form of synthetic rubber is generally more resistant to oil, solvents, and acids; and offers excellent resistance to water. Viton is generally compatible with hydrocarbons (an advantage over Buna-N, which is the most common seal material), but incompatible with ketones such as acetone.

• (3) Stainless steel valves standard with disc and/or cup made of Teflon^®
• R1351, R1361, R1371, R1381 Series
• Teflon^® is a brand of Polytetrafluoroethylene (PTFE) synthetic fluoropolymer. It is very non-reactive, and so is often used for reactive and corrosive chemicals. It offers higher temperature range and excellent resistance to most fluids, including water and oil.