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Teflon®
Teflon is a soft, waxy, opaque material that is nearly white in
color. It is about 90% crystalline and has a molecular weight between
500,000 and 2,000,000. Teflon is polymerized from a monomer (a small
molecule that combines with other monomers to yield a polymer called
tetraflouroethylene), which is produced through a series of chemical
reactions.
Teflon is inert to all solvents and chemicals agents except molten
alkali metals and hot fluorine gas. It is capable of stand continuous
exposure to temperatures ranging from near zero, to where it begins
to depolymerize above 600 °C (1112 °F). Because of its resistance
of the strong C-F bonds to chemical attack, Teflon is an inert,
tough, and nonflammable material widely used for electrical insulation.
Heat
Teflon retains its properties after exposure to temperatures
beyond the limit of almost all other thermoplastics and elastomers.
Depending on the end-use requirements, Teflon is rated for continuous
service at temperatures as high as 500°F. It also can sustain short
exposure at higher temperatures.
Flame Resistance
Teflon offers extraordinary resistance to high temperature and flames
because it has a very high melting point and auto-ignition Temperature,
as well as exceptional thermal degradation thresholds. Teflon's flame
propagation characteristics, such as rate of heat release and smoke
generation is very low Friction and Wear
Teflon has one of the lowest coefficients of friction of any solid
material. Its abrasions resistance is adaptable to demanding environments
by using inorganic fillers, such as glass fiber, carbon or graphite.
Contamination
Teflon is chemically pure and inert. It contains no additives such
as lubricants, stabilizers, plasticizers or antioxidants that can
contaminate process fluids.
Adhesion/Release
Teflon has an extremely low surface energy in the solid state. This
provides an excellent anti-stick, non-wetting contact surface. Conversely,
when these resins are in a molten form, they become low surface- tension
liquids, ideal for hot melt adhesives.
Low Temperature Service
Teflon retains its excellent properties even at cryogenic temperatures.
Teflon's impact resistance at these temperatures exceeds that of most
other polymers.
Corrosion
Teflon has excellent chemical resistance. It will resist most aggressive
organic and inorganic chemicals, acids and solvents over a broad temperature
range.
Service Life
Teflon exhibits excellent retention of properties after a long period
of time, even at elevated temperatures and in the presence of oils,
solvents, UV light, oxidizing agents and other environmental agents.
Light Stability
Teflon has one of the lowest refractive indexes. It does not change
its visual appearance after exposure to ultraviolet or infrared light.
Dielectrics
Teflon has remarkable dielectric strength, low dielectric constant,
low loss factors
and high specific resistance. Teflon surpasses most material in its
level and stability of dielectric properties over a wide range of
environmental conditions.
Biodegradation
Teflon is inert to microbiological and enzymic attack because the
pure polymer does not provide any nourishment or porosity for these
growths.
Atmospheric Aging
Teflon is not affected by ultraviolet and is resistant to oxidation,
discoloration, and embrittlement.
Humidity
Teflon is completely resistant to hydrolysis. Teflon is a good barrier
for water permeation. Its typical properties and dimensional stability
remain unchanged even after long periods of time in water. |
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