Dixon Sanitary 2010 Catalog

Technical Information
Sanitary Gaskets
Elastomers available:
Nitrile (Buna N)
Silicone (peroxide cured/platinum cured)
EPDM
FKM (Viton ® )
PTFE (Teflon ® )
Screens and orifice gaskets
(see page 160 for mesh sizes)
Teflon ® orifice gaskets are solid Teflon ®
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 influenced 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 - Identification of Gasket Materials
Elastomer
Part Number Typical
Identifier Color
Color Code Useful Temperature
Buna-N U black 1 red dot -25°F to 225°F
Buna-N UW white 1 red dot -25°F to 225°F
EPDM
E black 1 green dot -40°F to 275°F
sulfur cured
EPDM
E black 3 green dots -40°F to 275°F
peroxide cured
FKM (Viton ® ) SFY black 1 white dot -15°F to 375°F
brown 1 yellow dot
Silicone
XW white 1 pink dot -50°F to 400°F
peroxide cured
Silicone
XC clear none -50°F to 400°F
platinum cured
PTFE (Teflon ® ) G white none -10°F to 300°F
PTFE (Teflon ® )
w/50% 316 particles
GTS silver none -20°F to 450°F
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 (Viton ® ) 10 years
• Silicone 5 years
• PTFE (Teflon ® ) 20 years
Dixon Sanitary 2010 800.789.1718
159
U
Technical