Poly-Texx® HPVT
Poly-Texx® HPVT is a new self-lubricating Bearing Grade Composite containing PTFE fibers as a solid lubricant uniformly dispersed in a high strength thermoset resin system. Typical applications include sleeve and flanged bearings for railroad safety appliances and rail service vehicles. Having NSF 61 certification; they are suitable for (Potable) underwater applications. Poly-Texx® HPVT Split Bushings serve exceptionally well in the water treatment industry as flocculator bearings. Their high load capability and resistance to vibration serve 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 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 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 | D638 | psi | |
| Tensile Modulus of Elasticity, 73°F | D638 | psi | |
| Tensile Elongation (at break), 73°F | D638 | % | |
| Flexural Strength, 73°F | D790 | 22,000 | psi |
| Flexural Modulus of Elasticity | D790 | psi | |
| Shear Strength, 73°F | D732 | 11,000 | 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 | ||
| Compressive Strength ⊥ to Laminate (Modulus) | psi | ||
| Compressive Strength ⊥ to Laminate (Yield) | 40,000 | psi | |
| Compressive Strength ⊥ to Laminate (Ultimate) | 40,000 | psi | |
| Hardness, Durometer (Shore “D” scale) | D2240 | ||
| 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 | 34,000 | 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 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion (Sheet Stock) perpendicular to Laminates (Thickness) | PTM | 3 | 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 | ||
| Flammability @ 3.1mm(1/8 in.) UL94 | UL94 | ||
| Arc Resistance | seconds | ||
| Water Absorption, Immersion 24 Hours | D570 (2) | 0.5 | % |
| Water Absorption, Immersion Saturation | D570 (2) | 1.3 | % |
| 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 / Machinable to Custom Sizes |
