Elastomer Guide

Buna-N (Nitrile) EPDM (Ethylene Propylene Diene Monomer)

Symbol High Temp Characteristics Common Identi er Symbol High Temp Characteristics Common Identi er Very good with oil-based products Black with Very good with acid and caustic Black with 225 F Good with acid and caustic (2% caustic max; 0.5% acid max) red dot 300 F Good for steam 3 green dots U Loses life at high temperatures E Fats and oils will soften and distort material

Viton® (Steam Resistant Flouroelastomer) Te on® (Polytetra uoroethylene, PTFE)

Symbol High Temp Characteristics Common Identi er Symbol High Temp Characteristics Common Identi er

Very good with acid and most oils Black with Very good for virtually all uids and temperatures Good with caustic and steam yellow and Good for abrasive applications White 400 F white dot 450 F SFY Higher cost G Higher cost Poor exibility at low temperatures Inexible / Can deform under pressure

Silicone

Symbol High Temp Characteristics Common Identi er

Very good for high temperatures Translucent Higher cost with 450 F X Poor for high-pressure steam pink dot The information provided is intended to be used only as a guideline. Tears easily Due to the many variables in each unique application, testing is the best way to determine elastomer life. Extended exposure near or at high temperature limits may shorten the material life. For more information about elastomers, call Additional materials or colors may be available. Speci c material 417.831.1411 availability varies by product.