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PTFE SPECIFICATIONS

Technical Description

Discovered in 1938 by Dr. Roy J. Plunkett of the DuPont Company, PTFE is a fluorocarbon-based polymer. PolyTetraFluoroEthylene is commonly abbreviated PTFE, and the PTFE brand of PTFE is manufactured only by DuPont. the fluoroplastic family offers plastics with high chemical resistance, low an dhigh temperature capabiltiy, resistance to weathering, low friction, electrical and thermal insulation, and "slipperiness".


General Properties

PTFE mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of -100°F to +400°F (-73°C to 204°C). Mechanical properties are often enhanced by adding fillers (see filled grades below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and connto be melt processed - it must be compressed and sintered to form useful shapes.


Filled Grades

PTFE's mechanical properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze. Generally, filled PTFE's maintain their excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability, and wear resistance. The properties of 25% glass-filled PTFE grade are shown below. There are literally dozens of different filled PTFE products and grades - too many to be listed here. Please contact EPM for more information about other filled PTFE products for your application.


TYPICAL PROPERTIES of PTFE

ASTM or UL test Property PTFE
(unfilled)
PTFE
(25% glass filled)
PHYSICAL
D792 Density (lb/in?)
(g/cm?)
0.079
2.2
0.081
2.24
D570 Water Absorption, 24 hrs (%) < 0.01 0.02
MECHANICAL
D638 Tensile Strength (psi) 6,000 2,700
D638 Tensile Modulus (psi) 80,000 -
D638 Tensile Elongation at Break (%) 300 270
D790 Flexural Strength (psi) No break 1,800
D790 Flexural Modulus (psi) 27,000 19,000
D695 Compressive Strength (psi) 3,500 1,500
D695 Compressive Modulus (psi) 70,000 110,000
D785 Hardness, Shore D D50-65 D54
D256 IZOD Notched Impact (ft-lb/in) 3.5 2.0
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10
-5 in./in./°F)
7.5 5.0
D648 Heat Deflection Temp (°F / °C)
at 264 psi

132 / 55

150 / 65
D3418 Melting Temp (°F / °C) 635 / 335 635 / 335
- Max Operating Temp (°F / °C) 500 / 260 500 / 260
C177 Thermal Conductivity
(BTU-in/ft?-hr-°F)
(x 10
-4 cal/cm-sec-°C)

1.70
5.86

3.1
10.6
UL94 Flammability Rating V-O V-O
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 285 -
D150 Dielectric Constant at 1 MHz 2.1 2.4
D150 Dissipation Factor at 1 MHz < 0.0002 0.05
D257 Volume Resistivity (ohm-cm)at 50% RH > 1018 > 1015

Note: The information contained herein are typical values intended for reference and comparison purposes only. They should not be used as basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C unless otherwise noted.

PTFE is a registered trademark of DuPont


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