Acrylic - Materials - Technical

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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