Poly-Texx® HPVT/FR

Poly-Texx HPVG

Poly-Texx® HPVT/FR is a new self-lubricating Bearing Grade Composite containing PTFE fibers as a solid lubricant uniformly dispersed in a high strength thermoset resin system.  It also complies with the minimum rating for flame spread index and heat release and flammability testing in accordance with ASTM E162. Typical applications include slide pads, sleeve and flanged bearings for passenger transit coupler components and braking system components. It also has many applications in railroad safety appliances and rail service vehicles.  Suitable for underwater applications, Poly-Texx HPVT/FR has superior load handling capability, even under vibration. Other applications are well served in the timber, construction and agricultural industries as kingpin, knuckle boom and center pivot bearings.

Its main attribute is a PV rating of 40,000. Its ultimate compressive strength (P) exceeds 50,000 PSI, and is capable of a low-load velocity (V) of over 50 SFM (higher if lubricated).  The combination of excellent bearing properties, self-lubrication and low cost makes Poly-Texx® HPVT/FR the bearing material of choice for severe service applications.

Specification Test Value Units
Specific Gravity, 73°F D792  1.33
Tensile Strength @ Yield, 73°F LW Condition A D638 15,187 psi
Tensile Strength @ Yield, 73°F CW Condition A D638 12,315 psi
Tensile Modulus, 73°F, LW, Condition A D638 1,389,992 psi
Tensile Modulus, 73°F, CW, Condition A D790 1,118,648 psi
Flexural Strength, 73°F, LW, Condition A D790  21,574 psi
Flexural Strength, 73°F, LW, Condition A D790  18,738 psi
Compressive Strength – Ultimate  53,000 psi
Compressive Strength at 2% Deformation D695  N/A psi
Compressive Strength at 10% Deformation D695  N/A psi
Deformation Under Load  < 1.0 %
Compressive Modulus of Elasticity, 73°F D695 472,955 psi
Flexural Modulus, 73°F, LW Condition A D695 1,304,651 psi
Flexural Modulus, 73°F, CW Condition A D695  1,018,193 psi
Compressive Strength ⊥ to Laminate (Ultimate)  53,000 psi
Shear Strength, 73°F D732 11,000 psi
Hardness, Rockwell (Scale as noted) D785  100 Rockwell M
Izod Impact, Notched @ 73°F D256 Type A  2.3 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM 55007  0.14
Coefficient of Friction (Dry vs Steel) Dynamic PTM 55007  0.1
Maximum Static Bearing Load (P) PTM 55007  40,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM 55007  50 ft/minute
Maximum Limiting PV (Unlubricated) PTM 55007  40,000 psi x ft/min.
Wear Factor “K” x 10-10 PTM 55010  3.9 Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test  80 UHMW=100
Minimum Mating Surface Hardness Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831 (TMA)  5 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831 (TMA)  5 in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831 (TMA)  5 in/in/°F x 10-5
Softening Point °F
Heat Deflection Temperature 264 psi D648 °F
Embrittlement Temperature Cryogenic °F Min.
Continuous Service Temperature in Air  275 °F Max.
Short Term Service Temperature  350 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystalline) Peak D3418 °F
Thermal Conductivity F433 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149  200 Volts/mil
Volume Resistivity D257 ohm/cm
Surface Resistivity D257 ohm/cm
Dielectric Constant, 106 Hz D150
Dissipation Factor, 106 Hz D150
Flame Index Spread Rating ASTM E162 15 Pass = <30
Smoke and Toxicity Rating (BSS 7238) ASTM E662 Pass Report On Record
Water Absorption, Immersion 24 Hours D570 (2) %
Water Absorption, Immersion Saturation D570 (2)  .384 %
Machinability Rating  5 1=easy, 10=difficult
Tubing Diameter Availability (Made to Order) .50  60 inches
Sheet Thickness Availability (Made to Order)  .030  6.0 inches
Characteristics / Attributes  High Load / Low Speed / Excellent Vibration Resistance / High PV Rating / Self Lubricating / Low Flammability Rating