Acetal Polyoxymethylene Copolymer - POM 30% Glass Fibre Coupled

Polyoxymethylene is made in homopolymer as well as in copolymer forms which are not very different from each other. Both forms are tough, hard, stiff polymers with good appearance (can offer high surface gloss) and excellent abrasion resistance.

They are normally opaque, highly crystalline, and white in color, but they are often used colored. They have poor resistance to UV and generally to alkalis and acids.

When compared with the copolymer, the mechanical properties of the homopolymer are slightly better but its thermo-oxidative stability is somewhat worse. Only the copolymer is suited for continuous use with hot water.

Polymer Type



Superior rigidity, hardness, and tensile strength compared with unmodified copolymer are some of the advantages.

Improved mould shrinkage and lower coefficient of expansion. Excellent creep resistance. Also excellent solvent resistance associated with the copolymer.


Reduced impact strength compared to unmodified grades. Properties of glass reinforced grades are strongly influenced by the dimensions of the glass fibres and the efficiency of distribution in components can be highly anisotropic.


Applications include toys, ski boot bindings, models, sports equipment, for example, snap fit components, mast supports on wind surfing boards, and handles for tennis racquets.

The material is also used in frame connectors, sprockets and gears, slide guides for drawers, bearing bushes, water filter bodies, snap fittings, bearings, and many other engineering components.

Typical Properties

Property Value
Density (g/cm3) 1.63
Surface Hardness RM86
Tensile Strength (MPa) 134
Flexural Modulus (GPa) 9.6
Notched Izod (kJ/m) 0.1
Linear Expansion (/°C x 10-5) 4
Elongation at Break (%) 3.5
Strain at Yield (%) N/A
Max. Operating Temp. (°C) 100
Water Absorption (%) 0.3
Oxygen Index (%) 15
Flammability UL94 HB
Volume Resistivity (log 14
Dielectric Strength (MV/m) 20.7
Dissipation Factor 1 kHz 0.0025
Dielectric Constant 1 kHz 3.95
HDT @ 0.45 MPa (°C) 168
HDT @ 1.80 MPa (°C) 160
Material. Drying hrs @ (°C) 2 @ 90
Melting Temp. Range (°C) 200 - 210
Mould Shrinkage (%) 0.5
Mould Temp. Range (°C) 60 - 120

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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