POLYMETHYL METHACRYLATE (ACRYLIC)(PMMA)
Description
Acrylic is a hard, rigid material (it has a hardness comparable to aluminium) which maintains its clarity even with thick sections and after long exposures to outside atmospheres. However, it is easily scratched by dust or cleaning.
Properties
PMMA has high strength but is brittle. It is resistant to ultra violet radiation and weathering although can be vulnerable to crazing which can be worsened by detergents, greases and oils. It is flammable. Acrylic tends to attract dust so ideally and antistatic additive should be used.
Colouring
As the material is clear a wide range of colours is possible, both solid and translucent.
Resistance
|
Mineral Acids (dilute) |
Excellent |
|
Mineral Acids (concentrated) |
Poor |
|
Alkali |
Excellent |
|
Alcohol |
Good |
|
Ketone |
Poor |
|
Aromatic Hydrocarbon |
Poor |
|
Chlorinated Hydrocarbon |
Poor |
|
Detergents |
Excellent |
|
Oils, Greases |
Excellent |
Finishing
Mouldings can be joined using solvents or welded using ultrasonic welding, hot plate and friction. Parts can be machined but care needs to be taken to avoid scratching.
Applications
Because of its good UV stability and excellent clarity many applications of acrylic are lenses, lighting covers (indoor and outdoor), dials and control panels. Often used for lenses on rear lights of cars.
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