Poly-Texx® HPVT/FR
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 40,000 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 | 40,000 | 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) | 40,000 | 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 (Tube Stock / Diametric) 1/8″ wall / 1/4″ wall | PTM | .3 / .8 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion (Sheet Stock) parallel to Laminates (Cross Directional Average) | PTM | 1.0 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion (Sheet Stock) perpendicular to Laminates (Thickness) | PTM | 3.0 | 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 | 1.17 | 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 |
