Pp - Materials - Technical

Polypropylene

SPB Products made from this material
Balls

A thermoplastic with lower impact strength but better tensile strength and working temperature than LDPE or HDPE (low and high density polyethylene). Polypropylene is lighter than water, resists many acids and alkalis and has very low moisture absorption.

Disadvantages of polypropylene are high thermal expansion, high creep, poor UV resistance and accelerated oxidative degradation by contact with certain materials.

Properties of Polypropylene

Physical Properties
PROPERTY UNIT VALUE
Density g/cm3 0.905
Surface Hardness Rockwell R 80-110
Tensile Strength MPa 34
Flexural Modulus GPa 1.39
Notched Izod kJ/m 0.02 to 0.1
Coefficient of friction   0.1 to 0.3
Elongation at Break % 150-300
Max Operating Temp. oC 90-100
Water Absorption % 0.03
Flammability UL94 HB
Volume Resistivity Ohmcm 1016-1018
Dielectric Strength MV/m 30-40
Dissipation Factor @ 1 MHz 0.0003 - 0.0005
Dielectric Constant @ 1 MHz 2.2-2.6
Heat Deflection Temp. @ 0.45 MPa oC 100-105
Heat Deflection Temp. @ 1.80 MPa oC 60-65

Chemical Resistance
Chemical Resistance
Acids (Concentrated) Fair-Good
Acids (Dilute) Fair-Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair
Greases and Oils Fair-Good
Halogenated Hydrocarbon Poor-Good
Halogens Poor
Ketones Good

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 polypropylene items online in the Small Parts and Bearings Polypropylene 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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