Sanitary Gaskets for pipe coupling

GASKET SELECTION AND MATERIAL GUIDE

The choice of seal material will depend on the material being processed and the operating conditions. The table below is a general guidance on seal material selection. If any doubt please contact our sales office.
  • EPDM: Resistance is good to alcohol, ketones, mineral acids and alkalis. Especially suitable for CIP. Not suitable for use with oils and hydrocarbons. Temperature range from -50°C to 150°C.
  • FPM: Particularly resistant to acids, solvents and most commonly used chemicals in the food industry. Unsuitable for ketones, esters, hot concentrated caustic solutions, and steam. Temperature range from -30°C to 200°C.
  • NBR: Resistance is good to oils, mineral fats and water. Not recommended for CIP. Temperature range - 40°C to 100°C.
  • VMQ: High chemical resistance to most media encountered in the food industry.
  • Good resistance to oxidising agents, alkali solutions, and animal / vegetable fats. Not recommended for strong acids and bases. Temperature range from -60°C to 200°C.
  • PTFE: Almost universal chemical inertness. Suffers from cold flow and hence must not be over tightened. Temperature range from -100°C to 250°C.
  • KALREZ: Almost universal chemical inertness. Especially suitable for CIP, SIP and WFI systems. Temperature range -20°C to 260°C.
  • ENVELOPE: Almost universal chemical inertness. This gasket is a composite construction being a PTFE outer case, in contact with the media, and a FPM filler that provides elasticity. Temperature range from - 30°C to 200°C.

Material code
Material Approval(s) Colour Description
EPDM/301 EPDM FDA CFR21 :177.2600/USP Class VI/3A Black Sanitary Gasket
EPDM/400 EPDM FDA CFR21 :177.2600/USP Class VI/3A Black Sanitary Gasket
FPM FPM FDA CFR21 :177.2600 Black Sanitary Gasket
FPM/300 FPM FDA CFR21 :177.2600/USP Class VI/3A Green Sanitary Gasket
FPM/305 FPM FDA CFR21 :177.2600 Black Sanitary Gasket
KALREZ 6230 KALREZ FDA CFR21 :177.2600/USP Class VI/3A Black Sanitary Gasket
NBR/001 NBR FDA CFR21 :177.2600/USP Class VI/3A Black Sanitary Gasket
NBR/300 NBR FDA CRF21 :177.2600 Blue Sanitary Gasket
PTFE/598 PTFE FDA CFR21 :177.1550/USP Class VI/3A White Sanitary Gasket
PTFE ENVELOPE PTFE/FPM- FDA CFR21 :177.1550/2600 White/black Sanitary Gasket
VMQ/300 VMQ FDA CFR21 :177.2600 White Sanitary Gasket
VMQ/600 VMQ/PLATINUM FDA CFR21 :177.2600/USP Class VI/3A Transparent Sanitary Gasket

Compatibility Guide for Common Chemicals Used in CIP Processes

  EPDM
BUNA-N
Silicone
FKM
Sanifluor ®
Viton™ X
PTFE
Tyfluor
Acetone
1 4 4 4 4 2 1 1
Ammonia
1 2 2 4 4 4 1 1
Hydrochloric Acid
3 4 4 1 1 1 1 1
Hydrofluoric Acid
3 4 4 3 2 3 1 1
Hydrogen Peroxide
4 2 2 2 1 1 1 1
Isopropyl Alcohol
1 2 1 1 1 1 1 1
Nitric Acid
2 4 2 1 2 1 1 1
Phosphoric Acid
1 2 2 1 1 1 1 1
Sodium Hydroxide
1 2 2 2 1 1 1 1
Sodium Hypochlorite
2 2 2 1 1 1 1 1
Sulfuric Acid
2 3 4 1 1 1 1 1
Steam to 400ºF (204ºC)
3 4 4 4 1 3 3 3

1 - Excellent 2 - Good 3 - Limited 4 - Not Recommended
Viton™ is a registered trademark of DuPont Performance Elastomers