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Technical

Sanitary Gaskets

Materials available:
• Nitrile (Buna N)
• Silicone (peroxide cured)
• EPDM
• FKM
• PTFE

Certified as required to
• US Pharmacopoeia Class VI
Cytotoxicity Criteria
• Title 21CFR177.2600 & .1550
• USDA and 3A Sanitary Standards

All elastomeric gaskets require periodic replacement. Gasket life is infuenced by the gasket material, product
application, temperature, cleaning procedures, etc. After monitoring gasket conditions in a process system, a
schedule should be developed for replacement of gaskets.

Color Coding - Identific tion of Gasket Materials

Part Number
Elastomer Color Code Useful Temperature
Identifer
Buna-N U 1 red dot -25°F to 225°F
White Buna-N UW 1 red dot -25°F to 225°F
EPDM E 3 green dots -40°F to 275°F
peroxide cured
FKM SFY 1 white dot -15°F to 375°F
1 yellow dot
Silicone XW 1 pink dot -50°F to 400°F
peroxide cured
Silicone XC none -50°F to 400°F
peroxide cured
PTFE G none -10°F to 300°F
PTFE GTS none -20°F to 450°F
w/50% 316 particles

Packaging and Storing Information

The shelf life of rubber gaskets is the maximum period from cure date to the date the product is installed. During the shelf life
time, the rubber product is expected to retain its characteristics under the following conditions:
• stored in original packaging in a clean, dry warehouse
• not exposed to direct sunlight
• stored no closer than 6 feet from electric motors
• temperature between 65°F to 85°F

A guideline for shelf life of rubber gaskets manufactured from the following components should have the following shelf life not to
exceed:
• Buna 10 years
• EPDM 10 years
• FKM 10 years
• Silicone 5 years
• PTFE 20 years

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Dixon Sanitary 2014 800.789.1718