TEFLON
`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 materials. This fluoroplastic family offers 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 & PFA Specifications ) 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.
`
`ASTM or UL test
`
`Property
`
`TYPICAL PROPERTIES of PTFE
`PTFE
`(unfilled)
`
`PHYSICAL
`
`PTFE
`(25% glass filled)
`
`PTFE
`(25% carbon filled)
`
`D792
`D570
`
`D638
`D638
`D638
`D790
`D790
`D695
`D695
`D785
`D256
`
`D696
`
`D648
`D3418
`-
`
`C177
`UL94
`
`D149
`D150
`D150
`D257
`
`Density (lb/in³)
`(g/cm³)
`Water Absorption, 24 hrs (%)
`
`Tensile Strength (psi)
`Tensile Modulus (psi)
`Tensile Elongation at Break (%)
`Flexural Strength (psi)
`Flexural Modulus (psi)
`Compressive Strength (psi)
`Compressive Modulus (psi)
`Hardness, Shore D
`IZOD Notched Impact (ft-lb/in)
`
`Coefficient of Linear Thermal Expansion
`(x 10-5 in./in./°F)
`Heat Deflection Temp (°F / °C)
`at 264 psi
`Melting Temp (°F / °C)
`Max Operating Temp (°F / °C)
`Thermal Conductivity
`(BTU-in/ft²-hr-°F)
`(x 10-4 cal/cm-sec-°C)
`Flammability Rating
`
`MECHANICAL
`
`THERMAL
`
`0.078
`2.16
`< 0.01
`
`3,900
`80,000
`300
`No break
`72,000
`3,500
`70,000
`D50
`3.5
`
`7.5
`
`132 / 55
`635 / 335
`500 / 260
`
`1.7
`5.86
`V-O
`
`ELECTRICAL
`Dielectric Strength (V/mil) short time, 1/8" thick
`Dielectric Constant at 1 MHz
`Dissipation Factor at 1 MHz
`Volume Resistivity (ohm-cm)at 50% RH
`
`285
`2.1
`< 0.0002
`> 1018
`
`0.081
`2.25
`0.02
`
`2,100
`-
`270
`1,950
`190,000
`1,000
`110,000
`D60
`-
`
`6.4
`
`150 / 65
`635 / 335
`500 / 260
`
`3.1
`10.6
`V-O
`
`-
`2.4
`0.05
`> 1015
`
`0.075
`2.08
`0.05
`
`1,900
`-
`75
`2,300
`160,000
`1,700
`87,000
`D62
`-
`
`6
`
`150 / 65
`635 / 335
`500 / 260
`
`4.5
`15.5
`V-O
`
`-
`-
`-
`104
`
`NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a 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. TEFLON ® is a registered trademark of DuPont
`
`GE-1034.001