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Limitations: requires high processing temperatures (up to 350°c), requires good
drying equipment, not inherently flame retardant, attacked by powerful oxidants,
mineral acids, acetic acid and formic acid
Applications: housing for high temperature electrical connectors, used in cutlery,
automotive under the hood parts like engine cover, heater valve, fuel line
connectors and coolant pumps, fuse, bushings and bearing pads in aircraft
engines, medical catheters tubing, surgical trays, water heater manifolds,
thermostat housing, air coolers, electronic LEDs, cable wire protection, connectors,
halogen light housing, insulation foam, gas separation and water filtration
membranes, gas pipes, sports equipment, mfg. of electronic components via
soldering process without lead, in appliance for microwave, coffee machine, toaster.
FLUORINATED THERMOPLASTICS:
Fluoropolymers are a family of high-performance plastics possessing high thermal
stability for fluorine-carbon bond and excellent chemical resistance. Family
consists of a range of homo polymers (PTFE, PCTFE and PVDC) and copolymers
(FEP, ETFE, ECTFE, PFA)
36) Polytetrafluoroethylene (PTFE) :
Popularly known as "Teflon," which is actually a registered trademark of DuPont,
and is a brand that covers many types of fluoropolymers. PTFE being fully
fluorinated (all hydrogen atoms are replaced by fluorine atoms) has some of the
best properties in the family.
Density 2.1 - 2.2 g/ cm 3
Max / Min continuous Service temperature 250 - 270 °C / - 200 °C
Due to its very high viscosity above its melt temperature, it is impossible to use usual
thermoplastic techniques and so PTFE is generally shaped by compression or
sintering : PTFE powder is firstly compacted then heated at about 380°C and cooled
PTFE is Soft, smooth and formable, very low coefficient of friction, outstanding
chemical resistance, practically insoluble, non-wetability and chemically inert to
most chemicals and solvents. PTFE is incombustible and stable up to 260°C
(300°C for short periods), has excellent electrical insulating properties even at high
temperature and in damp atmosphere, exhibits the lowest electric constant and
lowest dissipation factors of all solid materials. Ideal for high purity and highly
corrosive applications has very low leaching.
Strengths: Excellent resistance to extreme temperatures (from -180 to 260°C),
FDA compliant, good dimensional stability, excellent UV resistance, outstanding
non-stick properties, good mechanical properties and high impact strength.
Limitations: High cost, Processing with usual thermoplastic techniques
impossible, High creep rate, Poor wear resistance, High density, sticking almost
impossible, toxic smoke emission; is attacked only by molten alkali metals and by
fluorine at high temperatures.
Applications: Seals and gaskets, Valve and fitting components, Pump parts,
Manifolds , Power train and engine parts, Fuel systems parts, Brake systems and
Chassis parts, chemical transfer hoses, lining and Joints in chemical industry,
wiring in aerospace, Semiconductor, bearings, joints, O-rings, stirring bars,
hazardous materials bottle pourers, handling high purity de-ionized water,

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