Rulon® W2

Rulon® W2 is a black PTFE-based material developed for use in fresh-water bearing and wear applications.  It exhibits low friction and excellent wear characteristics, as well as good thermal dissipation which will prevent shaft wear and galling.  Rulon® W2’s properties are actually enhanced when exposed to fresh water.  Rulon® W2 is DWGV (European) certified for applications in contact with drinking water.

It is compatible with most metal substrates and soft mating surfaces.  Rulon® W2 is a good alternative to Rulon® J when superior chemical resistance is needed.  However, it should not be used on very soft mating surfaces or where electrical insulation is desired.

Specification Test Value Units
Specific Gravity, 73°F D792  2.10
Tensile Strength @ Yield, 73°F D638  1800 psi
Tensile Modulus of Elasticity, 73°F D638  200,000 psi
Tensile Elongation (at break), 73°F D638  70 %
Flexural Strength, 73°F D790  600 psi
Flexural Modulus of Elasticity D790 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  60
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  0.25
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  B-25 Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831(TMA) in/in/°F x 10-5
Coefficient of Thermal Expansion (Bearing Diameter) E-831(TMA)  3.9 in/in/°F x 10-5
Coefficient of Thermal Expansion (Bearing Length) E-831(TMA) 4.9 in/in/°F x 10-5
Softening Point °F
Heat Deflection Temperature 264 psi D648 °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 (Crystalline) Peak D3418 °F
Thermal Conductivity F433  4.5 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149  350 Volts/mil
Volume Resistivity D257 ohm/cm
Surface Resistivity D257 ohm/cm
Dielectric Constant, 106 Hz D150  2.5
Dissipation Factor, 106 Hz D150
Flammability @ 3.1mm(1/8 in.) UL94 UL94  V-0
Arc Resistance 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)  .188-2.00 inches
Sheet Thickness Availability (Off the Shelf) inches
Characteristics / Attributes Fresh Water Bearing and Wear Applications / Self-Lubricating / Excellent Wear Resistance