Rulon® LR

Rulon® LR  is a member of the unique family of filled PTFE (polytetrafluoroethylene) products.  It is a maroon colored bearing material best known for its versatile design properties pertaining to high temperature and chemically aggressive bearing applications.  Relatively expensive as compared to other filled PTFE products, it is available in rod stock, tubing, sheet and thin film stock.  It is also available with ready to bond surface treatment upon request. Usually used as a bearing in sleeve bearing and flat sliding applications, Rulon® LR is compatible with most hardened steel shafting and/or mating surfaces.  Mild steel is acceptable although harder surfaces are better.  Rulon® LR is virtually chemically inert, making it an excellent choice for bearing and wear components in chemically aggressive environments.

Specification Test Value Units
Specific Gravity, 73°F D792 2.27
Tensile Strength @ Yield, 73°F D638  1,500 psi
Tensile Modulus of Elasticity, 73°F D638  200,000 psi
Tensile Elongation (at break), 73°F D638  150 %
Flexural Strength, 73°F D790  700 psi
Flexural Modulus of Elasticity D790  110,000 psi
Shear Strength, 73°F D732 psi
Compressive Strength – Ultimate  1,000 psi
Compressive Strength at 2% Deformation D695  1,000 psi
Compressive Strength at 10% Deformation D695 psi
Deformation Under Load %
Compressive Modulus of Elasticity, 73°F D695
Compressive Strength ⊥ to Laminate (Modulus) psi
Compressive Strength ⊥ to Laminate (Yield) psi
Compressive Strength ⊥ to Laminate (Ultimate) psi
Hardness, Durometer (Shore “D” scale) D2240  65
Hardness, Rockwell (Scale as noted) D785 Rockwell M
Izod Impact, Notched @ 73°F D256 Type A  6.0 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM55007  0.15
Coefficient of Friction (Dry vs Steel) Dynamic PTM55007  0.10
Maximum Static Bearing Load (P) PTM55007 1,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM55007  400 ft/minute
Maximum Limiting PV (Unlubricated) PTM55007  10,000 psi x ft/min.
Wear Factor “K” x 10-10 PTM55010 Cubic in.-min/
Sand Wheel Wear/Abrasion Test UHMW=100
Minimum Mating Surface Hardness  C-35 (327) Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831(TMA)  5.7 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831(TMA) in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831(TMA) in/in/°F x 10-5
Softening Point °F
Heat Deflection Temperature 264 psi D648  240 °F
Embrittlement Temperature  -400 °F Min.
Continuous Service Temperature in Air  550 °F Max.
Short Term Service Temperature 550 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystaline Peak) D3418 °F
Thermal Conductivity F433 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149  400 Volts/mil
Volume Resistivity D257  1×1015 ohm/cm
Surface Resistivity D257  2×1013 ohm/cm
Dielectric Constant, 106 Hz D150  2.5
Dissipation Factor, 106 Hz D150  0.003
Flammability @ 3.1mm(1/8 in.) UL94 UL94  V-0
Arc Resistance  180 to 240 seconds
Water Absorption, Immersion 24 Hours D570 (2) Nil %
Water Absorption, Immersion Saturation D570 (2)  Nil %
Machinability Rating  3 1=easy, 10=difficult
Rod Diameter Availability (Off the Shelf)  .250-4.750 inches
Sheet Thickness Availability (Off the Shelf) .250-1.00 inches
Characteristics / Attributes  Low Coefficient of Friction / Self Lubricating / creep resistant