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

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