Black Nylon vs Acetal/Delrin outdoors

I had planned to make some shoes to adapt the modern aluminium flag poles on out village hall to the cast iron supports from black nylon rod offcuts. The shoes are 6" diameter with a 3" hole in them. I know that black nylon weathers very slowly since the pieces I have used for tests have been stored outside for 3 decades and lost their surface finish.

I had expected to be able to buy nylon rod offcuts but they are a bit thin on the ground however black acetal is available in the right size. I have no idea how well it stands up to UV sunlight and weather though.

It is a real pain to get to these shoes and the old wooden ones have just about rotted away and a couple have fallen out. The poles are still captive but rattle around annoyingly. I am hoping to do a once and forever repair in plastic when the steeplejack is next up there.

The shoe isn't under any load it is basically there as a packer and just supports its own weight.

Any ideas how well acetal/Delrin will stand up to external use?

Reply to
Martin Brown
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Depends on the grade

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Reply to
newshound
8<

A coat of paint will protect it from uv.

Reply to
dennis

Thanks. I thought it might. With offcuts beggars can't be choosers but the difficulty of installing them means I want to be sure they will last

- especially since I may sell the lathe rather than move it.

They err on the side of caution and say good for two years outdoors and best off loaded with carbon black. I know black nylon is good for at least 30 years since one of the 1" thick pieces I have has already been outside that long. It isn't black any more and the surface is a bit poxy looking but it is still a perfectly good engineering material.

Reply to
Martin Brown

They used to dip ally spacers in some kind of gloopy coating where i worked for this kind of job. The coating was a little soft and made the poles rattle a lot less. Brian

Reply to
Brian Gaff

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