Page 161 - DixonSanitaryCatalog20082010

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