PTFE Mechanical Grade Sheet, Poltytetrafluoroethylene, (PTFE), Skived Sheet, recognized as the first fluorocarbon material in the world and referred to as PTFE or TFE, it is the most chemically resistant plastic known. It has a working temperature range of minus 400°F to 500°F, excellent thermal and electrical insulation properties and a low coefficient of friction.

With a non-stick surface, very few materials will adhere to it (See - Chemical Etching link below) and those that stick can easily be peeled or rubbed off. PTFE's mechanical properties are lower than other engineering plastics, but that can be improved by adding fillers such as glass fiber, carbon, graphite, molybdenum disulfide and bronze.

Common applications include, food processing, electrical parts, insulators, medical components, seals, bearings and high heat situations.

Note: Mechanical grade PTFE sheet is made from reprocessed PTFE resin and is less expensive than "Virgin grade" sheet, which is made from unreprocessed PTFE resin. Modern Plastics offers both grades.

Other attributes of PTFE Mechanical Grade Sheet products include:

• Temperature range of -400°F to 500°F
• Low coefficient of friction
• Easy to machine
• Excellent thermal and electrical insulation properties
• Many filler options available

Available Fills: Glass, Carbon, Graphite, Calcium, Ceramic, Bronze, Moly-Disulphide and Colors.

Property Comparison Chart of Various Fluoropolymers -Modern Plastics

Property	ASTM test method/test condition	PTFE	PFA	FEP	ETFE	CTFE
Physical Properties Specific gravity D792 D570/24 hrs 1/2"t 2.13~2.22 2.12~2.17 2.12~2.17 1.70~1.76 2.10~2.18 Water absorption (%) <0.00 <0.03 <0.01 <0.1 <0.00 Mold shrinkage (cm/cm) 0.02 ~0.05 0.04 0.03~0.06 0.03~0.04 0.015~0.020 Contact angle (degree) Angle to level 110 115 115 96 84
Thermal Properties
Thermal conductivity (cal/sec/cm)	C177	6 X 10-4	—	6 X 10-4	5.7 X 10-4	4.7~5.3 X 10-4
Coefficient of linear thermal expansion (1/°C)	D696/23~60°C	10 X 10-5	12 X 10-5	8.3~10.5 X 10-5	5~9 X 10-5	4.5 ~ 7.0 X 10-5
Melting point (°C)		327	302~310	270	260	210~212
Melt viscosity (coise)		10-11~10-13 (340-380°C)	10-4~10-5 (380°C)	4X10-4 ~10-5 (380°C)	10-4~10-5 (300-330°C)	10-7 (23°C)
Maximum temp. for continuous use (°C/°F)		260/500	260/500	200/392	150/302	120/248
Mechanical Properties
Tensile strength (kgf/cm2)	D638/23°C	140~350	280~315	190~220	410~470	320~420
Elongation (%)	D638/23°C	200~400	280~300	250~330	420~440	80~250
Compression strength (kgf/cm2)	D695/1% deformation, 25°C	50~60	50~60	50~60	109	90~120
Tensile modulus (kgf/cm2)	D638/23°C	4,000	—	3,500	5,000~8,000	10,500~21,000
Hexural Modulus (kgf/cm2)	D790/23°C	5,000~6,000	6,600~7,000	5,500~6,500	9,000~14,000	13,000~18,000
Impact strength (ft-lb/ln)	D256/23°C lzod	3.0	—	No breakdown	No breakdown	2.5~2.7
Hardness (Shore)	Durometer	D50~D65	D60	D55	D75	D90
Deformation under load (%)	D621/100°C 70 kfg/cm2, 24 hrs D621/25°C 140 kgf/cm2, 24 hrs	5.0 7.0	2.4 2.7	5.0 3.0	5.4 2.3	2.6 0.2
Static friction coefficient	Coated steel surface	0.02	0.05	0.05	0.06	0.08
Electrical Properties
Dielectric constant	D150/103Hz D150/108Hz	2.1 2.1	2.1 2.1	2.1 2.1	2.6 2.6	2.3~2.7 2.3~2.5
Dielectric dissipation factor	D150/103HZ D150/108HZ	<1 X 10-5 2 X 10-5	1 X 10-5 3 X 10-5	6 X 10-5 5 X 10-5	8 X 10-4 5 X 10-3	(2.3~2.7) X10-2 1 X 10-2
Dielectric breakdown strength (V/ml)	D149/Short time, 1/8 in	480	500	500~600	400	500
Volume resistivity (ohm-cm)	D257	>10-18	>10-18	>10-18	>10-18	>10-18
Chemical resistance Weatherability Combustibility (%)	D2863/Oxygen concentration index	Excellent Excellent >95	Excellent Excellent >95	Excellent Excellent >95	Excellent Excellent >31	Excellent Excellent >95

Typical Filler Properties
Filler	Physical Form	Amount (% Weight)	Effect of Filler
Glass Fibers	Milled Fibers	up to 40% (also in combination with graphite, MoS2 and carbon)	increased compressive strength increased rigidity increased wear resistance reduced cold flow resistant to organic solvent
Carbon Carbon Fibers	Powder Milled Fibers	up to 25% (also in combination with graphite, bronze, and glass) up to 30%	increased comprehensive strength increased hardness increased wear resistance improved thermal conductivity good dry running properties electrically conductive at higher filler contents resistant to hydrofluoric acid
Graphite	Powder	up to 25% (also in combination with glass, bronze, and carbon)	improved sliding properties reduced coefficient of friction improved thermal conductivity
Bronze	Powder	up to 60% (also in combination with carbon, graphite, and MoS2))	increased comprehensive strength increased hardness increased wear resistance improved thermal conductivity reduced cold flow
Molybdenum disulphide (MoS2)	Powder	up to 5% (also in combination with glass and bronze)	improved sliding properties increased wear resistance
Stainless Steel	Powder	up to 60%	improved thermal conductivity reduced cold flow resistant to most chemicals
Pigments	Powder	up to 2%	for coloring (identification)