TEFLON® (Click for Properties & Specs)
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Teflon’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
TFE'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.

Key Properties:chemical inertnessheat resistance moisture resistanceweather resistance toughness and flexibility

Uses:valve componentsgaskets- pump components bearingsdoor sliderscoil separators
 
TYPICAL PROPERTIES of TEFLON®

NOTE: All values are average test results from typical production material. No warranty is implied or guaranteed and testing is recommended for each application.

 ASTM or
 UL Test      Property Tested                    PTFE (unfilled)      PTFE (25% glass filled)
PHYSICAL  
 D792         Density (lb/in³)                   0.079                0.081
 D792         Density (g/cm³)                    2.2                  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/ft²-hr-°F)                 1.70                 3.1
              (x 10-4 cal/cm-sec-°C)             5.86                 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
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