Poly-Texx 641


Poly-Texx 641 is a member of the filled PTFE  (polytetrafluoroethylene) family and has the unique distinction of having FDA compliant components, along with the ability to withstand nearly all chemicals. It is self-lubricating, has low very low friction and is resistant to heat up to 550 degrees F.  Poly-Texx 641  is off-white in color where its mineral filler was especially developed for use in applications requiring FDA and USDA cleared materials.  Significantly, Poly-Texx 641 contains only USDA accepted and FDA cleared components that are non-toxic and has been used in many applications where incidental contact with food and/or body fluids occur. It is easily machined and is available in rod, sheet, tubing. Custom and standard bearing sizes are available.

Specification Test Value Units
Density, 73°F D792  2.25 gm/cm3
Tensile Strength @ Yield, 73°F D638  2,000 psi
Tensile Modulus of Elasticity, 73°F D638 psi
Tensile Elongation (at break), 73°F D4745  200 %
Flexural Strength, 73°F D790  600 psi
Flexural Modulus of Elasticity D790 psi
Shear Strength, 73°F D732 psi
Compressive Strength – Ultimate  1,000 psi
Compressive Strength at 2% Deformation D695  1,000 psi
Compressive Strength at 1% Deformation D695  700 psi
Deformation Under Load 24 hrs @ 2,000 psi D621 <14 %
Compressive Modulus of Elasticity, 73°F D695
Compressive Strength ⊥ to Laminate (Modulus) psi
Compressive Strength ⊥ to Laminate (Yield) psi
Compressive Strength ⊥ to Laminate (Ultimate) psi
Hardness, Durometer (Shore “D” scale) D2240 <50
Hardness, Rockwell (Scale as noted) D785 Rockwell M
Izod Impact, Notched @ 73°F D256 Type A  6.0 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM55007  0.10-0.15
Coefficient of Friction (Dry vs Steel) Dynamic PTM55007  0.1
Maximum Static Bearing Load (P) PTM55007  1,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM55007  400 ft/minute
Maximum Limiting PV (Unlubricated) PTM55007  10,000 psi x ft/min.
Wear Factor “K” x 10-10 PTM55010 Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test UHMW=100
Minimum Mating Surface Hardness  B-25 (64) Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion D696  3.9-5.5 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831(TMA) in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831(TMA) in/in/°F x 10-5
Softening Point °F
Heat Deflection Temperature 264 psi D648  250 °F
Embrittlement Temperature  -328 °F Min.
Continuous Service Temperature in Air  550 °F Max.
Short Term Service Temperature  550 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystalline) Peak D3418 °F
Thermal Conductivity F433  2.6 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149  350 Volts/mil
Volume Resistivity D257      – ohm/cm
Surface Resistivity D257      – ohm/cm
Dielectric Constant, 106 Hz D150  2.5
Dissipation Factor, 106 Hz D150      –
Flammability @ 3.1mm(1/8 in.) UL94 UL94  V-0
Arc Resistance seconds
Water Absorption, Immersion 24 Hours D570 (2)  Nil %
Water Absorption, Immersion Saturation D570 (2)  Nil %
Machinability Rating  3 1=easy, 10=difficult
Rod Diameter Availability  1.00-6.00 inches
Sheet Thickness Availability  .250-3.00 inches
Characteristics / Attributes FDA Compliant / Self Lubricating / Easily Machined