3 Sealant
Material		 Example Operating
Temperature Range		 Material definition and properties
G Graftite™ -328°F to +1,020°F
(to +1,600°F in a
reducing atmosphere)		 Graphite 98% purity. Impermeable to gases and liquids.
Resistant to most media, not 'wetted' by molten metals or salts. Asbestos-free.
No ageing or embrittlement. Good resistance to thermal shock. Not re-usable.
N Neoprene -40°F to +195°F Synthetic rubber based on polychloroprene.
The elastic properties of the polymer are enhanced by vulcanization.
It is much more resistant to heat, light, oxidation, and petroleum than
ordinary rubber. Re-usable.
L Lava -328°F to 1,600°F Natural Magnesium Silicate (Soapstone, Steatite or Rock Talc).
Crushes to a powder when compressed.
Porous to light gases and moisture. Hygroscopic.
Not suitable for most vacuum applications. Not re-usable.
T PTFE -328°F to 480°F Polytetrafluoroethylene. FDA approved grade to Title 21 -CFR 17. 1550 and is
approved to US Pharmacopoeia Class VI . Has smooth, non-wetting, hydrophobic surfaces
that resist biofilm buildup and the lowest coefficient of friction of any solid material.
Low thermal transfer. Re-usable.
V Viton® -40°F to 435°F
(intermittently to +545°F)		 Fluoroelastomer. Resists hydrocarbons, corrosive chemicals and petroleum.
Solvent, acid and base resistant.
Low permeation rate. Mechanically robust at high temperatures. Re-usable.
  Other sealant materials may be specified, usually for the individual special requirements of
particular applications. Please contact Spectite Inc. for assistance.
 
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