Poly-Texx® HPVG
Poly-Texx® HPVG is a new self-lubricating Bearing Grade Composite containing graphite as a solid lubricant. Typical applications include sleeve and flanged bearings for railroad safety appliance and service vehicles, hydraulic guide rings, kingpin and idler bushings for the timber, construction, and agricultural industries.
Its main attribute is a PV rating of over 35,000. Its compressive strength (P) exceeds 34,000 PSI, and is capable of a low-load velocity (V) of over 40 SFM. The combination of excellent bearing properties, self-lubrication and low cost makes Poly-Texx® HPVG a great choice for many demanding 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 | % | |
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 | 40 | ft/minute |
Maximum Limiting PV (Unlubricated) | PTM 55007 | 35,000 | 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 | 20 | Rockwell (Brinnell) | |
Coefficient of Linear Thermal Expansion | E-831 (TMA) | 5.0 | in/in/°F x 10^{-5} |
Coefficient of Thermal Expansion // to Laminates | E-831 (TMA) | 5.0 | in/in/°F x 10^{-5} |
Coefficient of Thermal Expansion I to Laminates | E-831 (TMA) | 5.0 | 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 | BTU-in/(hr/ft^{2}°F) | |
Dielectric Strength Short Term | D149 | 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) | 2.0 | % |
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 / Low Speed / High PV Rating / Self Lubricating / Static Dissipative / Machinable |