[PSUBS-MAILIST] Electrical thru-hull

[Sean T. Stevenson via Personal_Submersibles]

Outside of acrylic (Plexiglas) and polycarbonate (Lexan), there are three other plastics which I tend to employ often:  acetal (Delrin), ultra-high molecular weight polyethylene (UHMW), and perfluoroalkoxy alkane (PFA). I use Delrin for most machined components when plastic is preferable to metal for reasons of corrosion resistance, thermal or electrical insulation, avoiding wear, etc., but I otherwise need a reasonably strong, reasonably hard dimensionally stable part that is easy to machine.  UHMW I use for skids, bumpers, wear plates, spacers, stops, insulators, component mounts and other parts which do not demand tight tolerances, but still can perform well.  UHMW is great for tubing mounts. PFA I use when I need chemical resistance, or for any components in breathing conduits, potable water or food safe applications, as it is easily disinfected and does not present any offgassing or toxicity risk, and behaves otherwise like PTFE (Teflon).

Sean


On February 8, 2016 5:21:18 PM MST, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Hi Jon,
>Regarding banging delrin around, I can add that it's the plastic of
>choice
>for tech diving canister lights (which have 200m+ ratings), reels and
>general paraphernalia, and it has an excellent track record.
>
>I have a book about DIY dive lights (it's by Steve Lindblom and is
>pretty
>cheap if you're in the states) which went into a good discussion on
>plastics and why delrin was right up there - properties like being
>impervious to water, impact resistant, pretty strong, easy to machine,
>good
>over a range of temperatures, etc.
>
>Cheers,
>Steve
>On 9 Feb 2016 4:51 am, "Jon Wallace via Personal_Submersibles" <
>personal_submersibles at psubs.org> wrote:
>
>>
>> Anyone know how the delron is going to hold up to being banged on
>assuming
>> I swing the sub around and something hits it?  Maybe a stainless body
>with
>> a delron insert would be a better design from that perspective?
>>
>> Jon
>>
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