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TEFLON

 
TECHNICAL DESCRIPTION
PolyTetraFluoroEthylene is a fluorocarbon-based polymer and is commonly abbreviated PTFE. The Teflon® brand of PTFE is manufactured only by DuPont. Several other manufacturers make their own brands of PTFE which can often be used as substitute material. This fluoroplastic family offers plastics with high chemical resistance, low and high temperature capability, resistance to weathering, low friction, electrical and thermal insulation, and "slipperiness".
( see also Teflon® PTFE and Teflon® FEP & PFASpecifications )
 
קליק על תמונה לקבל תמונה בגודל טבעי. ולאחר מכן קליק ימני . העתק. אחר כך קליק בשטח דף , קליק ימני והדבק.

 

 

GENERAL PROPERTIES
PTFE's mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of of -100°F to +400°F (-73°C to 204°C). Mechanical properties are often enhanced by adding fillers (see paragraph below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and cannot 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 and 25% carbon-filled PTFE grades are shown below for comparison purposes. There are literally dozens of different filled PTFE products and grades -- too many to be listed here. Please contact Boedeker Plastics for more information about other filled PTFE products for your application.
(see also Semitron ESd 500 Static-Dissipative PTFE |Fluorosint Filled PTFE | Rulon Filled PTFESpecifications)

 

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TYPICAL PROPERTIES of PTFE 
 
ASTM or UL test Property PTFE
(unfilled)
PTFE
(25% glass filled)
PTFE
(25% carbon filled)
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.078
2.16
0.081
2.25
0.075
2.08
D570 Water Absorption, 24 hrs (%) < 0.01 0.02 0.05
MECHANICAL
D638 Tensile Strength (psi) 3,900 2,100 1,900
D638 Tensile Modulus (psi) 80,000 - -
D638 Tensile Elongation at Break (%) 300 270 75
D790 Flexural Strength (psi) No break 1,950 2,300
D790 Flexural Modulus (psi) 72,000 190,000 160,000
D695 Compressive Strength (psi) 3,500 1,000 1,700
D695 Compressive Modulus (psi) 70,000 110,000 87,000
D785 Hardness, Shore D D50 D60 D62
D256 IZOD Notched Impact (ft-lb/in) 3.5 - -
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
7.5 6.4 6.0
D648 Heat Deflection Temp (°F / °C)
at 264 psi

132 / 55

150 / 65

150 / 65
D3418 Melting Temp (°F / °C) 635 / 335 635 / 335 635 / 335
-
 
Max Operating Temp (°F / °C) 500 / 260 500 / 260 500 / 260
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

1.70
5.86

3.1
10.6

4.5
15.5
UL94 Flammability Rating V-O 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 104