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Polyoxymethylene - Homopolymer ( Acetal - Homopolymer POMH )

Material Information

Buy Polyoxymethylene - Homopolymer on-line

We stock and supply the following standard forms:
Film Rod Sheet Sphere
Film Rod Sheet Sphere

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Common Brand Names:
Delrin, Tenac
 
General Description:  

General Description : Made in both homopolymer and copolymer forms. Both are hard, tough, stiff polymers with excellent abrasion resistance and good appearance (can give high surface gloss). Normally highly crystalline and opaque, their natural color is white but they are often used colored. They have poor resistance to U.V. and generally to acids and alkalis. The homopolymer has slightly better mechanical properties but somewhat worse thermo-oxidative stability than the copolymer. Only the copolymer is suitable for continuous use with hot water.

Applications are wide-ranging including gears, bearings, snap fittings and many other engineering components, plumbing fittings, appliance casings and jug kettles.

   

Chemical Resistance

Acids - concentrated Poor
Acids - dilute Poor - Fair
Alcohols Good-Fair
Alkalis Poor
Aromatic hydrocarbons Good
Greases and Oils Good
Halogenated Hydrocarbons Good-Poor(?)
Halogens Poor
Ketones Good - Fair

Electrical Properties

Dielectric constant @1MHz 3.7
Dielectric strength ( kV mm-1 ) 20
Dissipation factor @ 1MHz 0.005
Surface resistivity ( Ohm/sq ) 1015
Volume resistivity ( Ohmcm ) 1015

Mechanical Properties

Coefficient of friction 0.2 - 0.35
Elongation at break ( % ) 40 - 75
Hardness - Rockwell M94
Izod impact strength ( J m-1 ) 75 - 130
Poisson's ratio 0.35
Tensile modulus ( GPa ) 2.9 - 3.1
Tensile strength ( MPa ) 70

Physical Properties

Density ( g cm-3 ) 1.42
Flammability HB
Limiting oxygen index ( % ) 15
Radiation resistance Poor
Resistance to Ultra-violet Poor
Water absorption - equilibrium ( % ) 0.6 - 0.9
Water absorption - over 24 hours ( % ) 0.25

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 122
Heat-deflection temperature - 0.45MPa ( C ) 170
Heat-deflection temperature - 1.8MPa ( C ) 135
Specific heat ( J K-1 kg-1 ) 1500
Thermal conductivity @23C ( W m-1 K-1 ) 0.22-0.24
Upper working temperature ( C ) 80-120

Properties for Polyoxymethylene - Homopolymer Film

Property Value
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 1.3
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.06
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 420-680
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Polyoxymethylene - Homopolymer on-line

We stock and supply the following standard forms:
Film Rod Sheet Sphere
Film Rod Sheet Sphere

Choose a form to search our on-line catalog  

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