Poly-Texx® HPVO
Poly-Texx® HPVO is a new self-lubricating Bearing Grade Composite containing PTFE fibers and oil as lubricants within a high strength thermoset resin system. Typical applications include linkage pin bearings for on-board securement devices as well as sleeve and flanged bearings in railroad braking components. Poly-Texx HPVO serves the timber, construction, and agricultural industries in applications such as knuckle boom and center-pivot bearings.
Its main attribute is a PV rating of 45,000. Its compressive strength (P) exceeds 34,000 PSI, and is capable of a low-load velocity (V) of over 60 SFM. The combination of excellent bearing properties, self-lubrication and low cost makes Poly-Texx® HPVO a great choice for high load / vibratory applications requiring low friction.
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 | 22,019 | 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 | N/A | |
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 | 0.1 | |
Coefficient of Friction (Dry vs Steel) Dynamic | PTM 55007 | 0.05 | |
Maximum Static Bearing Load (P) | PTM 55007 | 34,000 | psi |
Maximum Unlubricated No Load Bearing Velocity (V) | PTM 55007 | 60 | ft/minute |
Maximum Limiting PV (Unlubricated) | PTM 55007 | 45,000 | 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/ft^{2}°F) | |
Dielectric Strength Short Term | D149 | 175 | 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) | .125 | 6.0 | inches |
Characteristics / Attributes | High Load / Moderate Speed / Excellent Vibration Resistance / High PV Rating / Oil Filled / Self Lubricating |