Shop Gaskets.

Item / Material Temperature Range 1Chemical Resistance Tear Resistance 2Durometer General Information
Nitric Acid Phosphoric Acid Sodium Hypochlorite Chlorine Fats/Oils
Standard
Buna-N -40 to 225 F Poor Good Good Poor Excellent Good 72 Standard Dairy & Food industry gasket. High volume equates to lowest cost. Does not hold up well to Nitric based CIP cleaners. Std. black, also white.
EPDM -60 to 300 F Good Excellent Good Fair Good Fair 70 Good general Dairy and Food gasket. Better overall chem. resistance than Buna – not quite as good fat/oil. Std. black, also white.
Viton -20 to 350 F Excellent Excellent Excellent Excellent Excellent Good 80 Best overall chem. resistance of common rubber gaskets. Highest price point. Std. black, also white.
Silicone -80 to 450 F Good Fair Good Poor Good Fair 70 More common in pharmaceutical than dairy. Good overall chem. resistance. Excellent temp range. Softer durometer. Generally white or red color.
Teflon -40 to 450 F Excellent Excellent Excellent Excellent Excellent Excellent 56 Excellent chem. & temp resistance. Very hard durometer can make sealing difficult in pipeline gasket application. Std. white, also blue.
Specialty
TufSteel -100 to 500 F Excellent Excellent Excellent Excellent Excellent Excellent 68 Passivated SS & Teflon blended in molten state (prior to molding). Highest chem. & temp resistance. Hard durometer. Highest price point. Gray color.
Metal Detectable As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber Ferrous powder mixed with rubber in molten state (prior to molding). Has same general characteristics as base rubber. Std. in Silicone & Buna. Generally red or white color.
Color Coded As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber As base rubber Color code by area or date changed. Has same general characteristics as base rubber. Std. Buna. Others with minimum.
Teflon Envelope -40 to 450 F Excellent Excellent Excellent Excellent Excellent Excellent 65-75 A “sandwich”. Teflon wrapped around Buna. Gives some better sealing than std. Teflon, but still not as good as rubber.
1Information from Robinson Rubber Specification Guide & Rosemount Analytical Chemical Resistance Chart. Phosphoric Acid 20%; Nitric Acid Dilute; Chlorine Wet.

2Typical – actual may vary depending on manufacturer.

Pipeline Gasket Reference Guide