Acetal Polyoxymethylene - POM 30% Carbon Fibre Reinforced

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

Usually highly crystalline and opaque, their natural colour is white but they are typically used coloured. They have poor resistance to UV and generally to alkalis and acids.

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

Polymer Type

Thermoplastic

Advantages

Significantly increased flexural modulus, moderate increase in tensile strength and HDT compared with unmodified Acetal.

Disadvantages

Significant reduction in elongation at break and moderate reduction in notched izod impact strength compared with unmodified Acetal. Incorporation of carbon fibres can cause anisotropic mechanical properties in moulded components and reduced electrical resistance.

Applications

Applications are wide-ranging such as bearings, cams, gears, snap fittings, and many other engineering components. Polyoxymethylene is also used in jug kettles, appliance casings, and plumbing fittings.

Polyoxymethylene has excellent abrasion resistance which is why it is used in plumbing fittings. Image Credit: ShutterStock/ DmitryNaumov

Polyoxymethylene has excellent abrasion resistance which is why it is used in plumbing fittings. Image Credit: ShutterStock/ DmitryNaumov

Typical Properties

Property Value
Density (g/cm3) 1.48
Surface Hardness RM94
Tensile Strength (MPa) 85
Flexural Modulus (GPa) 17.2
Notched Izod (kJ/m) 0.038
Linear Expansion (/°C x 10-5) 4
Elongation at Break (%) 1
Strain at Yield (%) N/A
Max. Operating Temp. (°C) 105
Water Absorption (%) 0.2
Oxygen Index (%) 18
Flammability UL94 HB
Volume Resistivity (log ohm.cm) 2.95
Dielectric Strength (MV/m) 3.3
Dissipation Factor 1 kHz NA
Dielectric Constant 1 kHz NA
HDT @ 0.45 MPa (°C) 168
HDT @ 1.80 MPa (°C) 162
Material. Drying hrs @ (°C) 2 @ 90
Melting Temp. Range (°C) 170 - 210
Mould Shrinkage (%) 0.2
Mould Temp. Range (°C) 100 - 120

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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