Poly-Texx® HPVG

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 40,000 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 (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 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