Polymethylmethacrylate - Acrylic - PMMA General Purpose

Polymer Type

Thermoplastic

Advantages

Outstanding weathering and resistance to UV radiation. Transparent. High gloss and hardness. Good rigidity. Dimensionally stable. Good abrasion resistance  - surface scratches can be polished out.

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

Property

Value

Density (g/cm3)

1.18

Surface Hardness

RM92

Tensile Strength (MPa)

70

Flexural Modulus (GPa)

2.9

Notched Izod (kJ/m)

0.02

Linear expansion (/°C x 10-5)

7

Elongation at Break (%)

2.5

Strain at Yield (%)

N/A

Max. Operating Temp. (°C)

50

Water Absorption (%)

0.3

Oxygen Index (%)

19

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

15

Dielectric Strength (MV/m)

25

Dissipation Factor 1kHz

0.03

Dielectric const. 1kHz

3.3

HDT @ 0.45 MPa (°C)

103

HDT @ 1.80 MPa (°C)

95

Material. Drying hrs @ (°C)

2 @ 75

Melting Temp. Range (°C)

220 - 240

Mould Shrinkage (%)

0.6

Mould Temp. Range (°C)

60 - 80

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

For more information on Plascams please visit RAPRA Technology Ltd.

 

Date Added: Sep 4, 2001
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