Polymethylmethacrylate - Acrylic - PMMA General Purpose

A transparent thermoplastic, Polymethylmethacrylate (PMMA) is a possible lightweight, shatter-resistent substitute for glass. Often referred to as acrylic glass, PMMA is a synthetic polymer of the organic compound methyl methacrylate (MMA). It is seen as a cheap alternative to polycarbonate when high strength is not necessarily a stringent requirement for the given application.

PMMA in its unmodified form can be brittle with particularly poor impact toughness and has a lower hardness than conventional glass rendering it prone to scratches. However, when modified, both of these properties can be significantly improved.

Polymer Type

Thermoplastic

Advantages

There are a number of advantages to using PMMA:

• Outstanding weathering and resistance to UV radiation

• Transparent

• High gloss and hardness (when modified)

• Good rigidity

• Dimensionally stable

• Good abrasion resistance - surface scratches can be polished out (when modified)

Disadvantages

• Not a tough material in comparison with engineering plastics - notch sensitive and generally brittle

• Although not attacked by alcohol alone, alcohol with carbon tetrachloride and ether will cause swelling

• Dissolved by most aromatic and chlorinated hydrocarbons

• Water absorption is low but can have a considerable effect on dimensions and a lesser one on mechanical properties

Typical Properties

Applications

• Sinks, baths, knobs and batons

• Displays and signs

• Aircraft glazing, technical models, tap tops and accessories

• Automotive rear light housings, automotive components such as badges, steering wheel insignia and fascia panels

Source : Abstracted from Plascams

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