Polyurethane - Materials - Technical

Polyurethane (Urethane)

SPB Products made from this material
Pressure Roller Bearings (Coating on OD), Rod, Timing Belts

Polyurethane offers the elastic properties of rubber and the toughness of metal. It can be supplied in a variety of hardnesses and has excellent abrasion and tear resistance. Polyurethane is resistant to oil, but has poor resistance to acids.

Properties of Polyurethane

Physical Properties
Density g/cm3 0.9
Surface Hardness   Varies
Tensile Strength MPa 4
Flexural Modulus GPa 0.01
Notched Izod kJ/m 1.06+
Linear Expansion per oC 0.00013
Elongation at Break % 120
Strain at Yield %  :
Max Operating Temp. oC 70
Water Absorption % 10
Oxygen Index % 24
Flammability UL94 HB
Volume Resistivity log ohm.cm 12
Dielectric Strength MV/m 16
Dissipation Factor @ 1kHz 0.003
Dielectric Constant @ 1kHz 4
Heat Deflection Temp. @ 0.45 MPa oC 20
Heat Deflection Temp. @ 1.80 MPa oC 20

Note! Property values are typical and should be used only as a guide to selection of materials and not as purchase specifications.

You can purchase online at Small Parts and Bearings Urethane Online Catalogue pages.

For a huge range of bearings online please visit the Bearing Shop Online Website.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.

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