Acrylic - Materials - Technical

Acrylic - Polymethylmethacrylate (PMMA)

HES 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 Hobby and Engineering Supplies PMMA Online Catalogue pages.


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

The Small Parts and Bearings has a much larger range of engineering supplies.

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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