Expanded PTFE Sheet
PTFE is the most
universal gasketing material available. Expanded PTFE has the
inherent properties of PTFE, plus it is much more compressible
to allow sealing even problem flanges having irregular or
rough surfaces, at lower flange bolting torque than other
gasketing materials. A tremendous, per gasket cost can be
realized using our Joint Sealant, since scrap from die cutting
sheets is eliminated, and gasket inventories are reduced
- Temperature Limits from -450°F
to 600°F
- 0-14 pH Range
- Good in most chemicals (except
molten alkali metals & elemental fluorine)
- Sealing pressure from full
vacuum to 3000 psi internal pressure can be achieved and depends
on a number of factors including:
- Flange type and pressure rating
- ANSI 150lb., 300lb, etc. Flanges with higher pressure ratings
have more or larger bolts and heavier flanges allowing higher
gasket loads.
- Condition of the flange
surfaces - Expanded PTFE joint sealant is more conformable than
other more rigid gasketing materials for better sealing of
scratched or pitted surfaces.
- Temperature - Higher
temperatures provide lower sealing pressure capability.
- Type of liquid or gas being
sealed - Liquids generally require less load to seal than gases.
The surface tension of PTFE for a particular fluid is also a
factor.
- Temperature Cycling - Thermal
cycling can cause problems if the cycling results in
significantly reduced pressure on the gasket. Installation of
spring washers on the flange bolts is a proven means of
minimizing temperature cycling effects.
To view info on
Expanded PTFE Joint Sealant click Here
|
Sheet
Sizes |