About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.


Engineering Plastic

Acetal Engineering Plastic

A high-quality general-purpose engineering plastic material; the chemical name is polyoxymethylene. It’s available in a range of grades and forms to suit many applications.


The machinability of un-modified Acetal is excellent. Good chip forming leads to fine surface finishes. As with all plastic materials, experience has shown that extra care must be taken with larger diameters, especially in the colder months when plastic materials lose some of their toughness, and so have less resistance to machining stresses. It’s therefore important that these materials are not machined while in a chilled condition. Full machining instructions are available on request.

Chemical Resistance

Acetal co-polymer has chemical resistance similar to Nylon 66, but is slightly more prone to attack – having good resistance to many common solvents, lubricant, esters, ketones and aqueous solutions of acids and alkalis between ph5 and ph11. The co-polymer is not resistant to phenols, cresols, formic acid, concentrated mineral acids and alkalis, and strong oxidising agents including halogens. The homo-polymer has slightly reduced resistance to alkalis and hot water compared with co-polymer.

Typical Applications

Commercial applications for this engineering material include:

  • Gears, meter components, valves
  • Discs, impellers, seals, bearings, sliding & spring elements
  • Valve bodies, snap-on connections & pump components
  • Bearing cages, clutch and gearbox parts, sorting & feeding devices
  • Electrical & electronic industry- e.g. coil bodies, insulators

We stock Acetal in round bar, plate, sheet, hollow bar and square bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for Acetal is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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