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Acrylic - Materials - Technical
- from Small Parts and Bearings

Acrylic - Polymethylmethacrylate (PMMA)

SPB Products made from this material
Balls

PMMA is an amorphous, transparent thermoplastic that is hard and stiff but brittle and notch-sensitive. It is UV resistant but has poor low temperature and solvent resistance. It is flammable but it has low smoke emission.

Properties of Polymethylmethacrylate

Physical Properties
PROPERTY UNIT VALUE
Density g/cm3 1.19
Surface Hardness Rockwell M 92-100
Tensile Strength MPa 80
Tensile Modulus GPa 2.4-3.3
Izod Impact Strength J m-1 16-32
Elongation at Break % 2.5-4
Max Operating Temp. oC 85
Water Absorption % 0.2 Over 24 Hours
Flammability UL94 HB
Volume Resistivity ohm.cm 2-14x1015
Dielectric Strength kV/mm-1 15
Dissipation Factor @ 1MHz 0.014
Dielectric Constant @ 1MHz 2.6
Heat Deflection Temp. @ 0.45 MPa oC 105
Heat Deflection Temp. @ 1.80 MPa oC 95
Chemical Resistance
Chemical Resistance
Acids (Concentrated) Poor-Good
Acids (Dilute) Poor-Good
Alcohols Poor-Good
Alkalis Good
Aromatic hydrocarbons Poor
Greases and Oils Good
Halogenated Hydrocarbon Poor
Halogens Poor
Ketones Poor

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

You can find PMMA products online at Small Parts and Bearings PMMA 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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Small Parts and Bearings offers 119491 products in 3056 categories including ball bearings, roller bearings, thrust bearings, ceramic and ceramic hybrid bearings, stainless steel bearings, miniature bearings, linear bearings, shafting, oil seals and adhesives - see the full listing in the Online Catalogue. We have excellent Freight Rates within Australia and worldwide. We offer a choice of delivery with a signature required, or cheaper options with no signature required. The no signature required options are at the customer’s risk once the goods leave our store.

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