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High Density, low friction plastic

High Density, low friction plastic

Hello Everyone,

I am looking for a plastic material that I can make a shim and cylinder out of- it needs to be strong enough to support screw threads through its sidewalls, but have low enough friction to be able to effectively slide up and down. Low wear is also a necessity. Does anyone have any material ideas for plastic on plastic sliding? The pieces are for a film thickness guage that uses the Eddy current, so no metal can be near the tip. Thanks in advance.

Benjamin Tremblay

RE: High Density, low friction plastic

Polyoxymethylene, commonly called acetal. Trade names Hostaform, Delrin amongst many, many others. Available in bar/sheet stock for machining or pellets for extrusion and injection mouldings.

Some injection moulding grades are available with PTFE in for even lower friction.

Easy to machine or mould.



RE: High Density, low friction plastic

Thanks Harry,

Would this material be available to rapid prototypers by any chance?


RE: High Density, low friction plastic


I'm not aware of an additive RP process that uses acetal (SLS comes to mind as a possibility, but I've never seen an SLS part in acetal).  You can certainly have prototypes machined from acetal stock.

RE: High Density, low friction plastic

Thanks guys,

Sounds good. This gives me a solid start. Appreciate it.

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