Polymethylmethacrylate - Acrylic - PMMA Cast Sheet

Sep 4 2001

Polymer Type

Thermoplastic

Advantages

Transparent, good surface finish, good outdoor weathering properties and rigidity. Good electrical insulating properties at low frequency. Resistant to alkalis. Easily machineable using drills, saws, and the like. Low mould shrinkage (~ 0.8%), thermoformable.

Disadvantages

Poor scratch resistance, dissolved by a number of organic solvents - organic materials that are not solvents for acrylic can cause cracking and crazing. Attacked by mineral acids. Difficult to weld but can be satisfactorily solvent cemented. Not suitable for normal vacuum forming operations.

Typical Properties

Property	Value
Density (g/cm³)	1.19
Surface Hardness	RM104
Tensile Strength (MPa)	72
Flexural Modulus (GPa)	3.1
Notched Izod (kJ/m)	0.02
Linear Expansion (/°C x 10^-5)	6
Elongation at Break (%)	4
Strain at Yield (%)	N/A
Max. Operating Temp. (°C)	50
Water Absorption (%)	0.2
Oxygen Index (%)	18
Flammability UL94	HB
Volume Resistivity (log ohm.cm)	17
Dielectric Strength (MV/m)	20
Dissipation Factor 1kHz	0.04
Dielectric Constant 1kHz	3.3
HDT @ 0.45 MPa (°C)	107
HDT @ 1.80 MPa (°C)	96
Material. Drying hrs @ (°C)	NI
Melting Temp. Range (°C)	NA
Mould Shrinkage (%)	0.04
Mould Temp. Range (°C)	NA

Applications

Glazing, illuminated and non-illuminated signs. Street lamp housings, coach roof lights, guards for machines and food displays. Bath and washbasins. Covers on solar panels

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.