Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

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Thread: Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

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    Default Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

    Hello Group, I am looking at a project that would require machining parts out of "Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet". I have never machined this material before and was wondering if it is easy to machine? Would I use the same speed and feeds as I would machining acrylic? Another thought would be laser cutting these and would it be safe?

    Thank you,
    Eric

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    Community Moderator Jim Dawson's Avatar
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    Default Re: Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

    It machines better than acrylic, pretty much like butter. Very forgiving. Maybe a bit higher feed rates than acrylic would be better.

    Jim Dawson
    Sandy, Oregon, USA


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    Member routalot's Avatar
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    Default Re: Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

    One word of caution,If you machine pockets or tapers,it does tend to curl up a bit as the internal stresses are relieved.As for speed,I had cut various rebates and corner radii with a hand router on a good number of parts before trying the material on a CNC.Since the finish was good I used similar speeds and it worked.



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    Default Re: Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

    Thanks Jim Dawson and routalot that helps me alot!

    Eric



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    Default Re: Marine-Grade Moisture-Resistant Polyethylene (HDPE) Sheet

    Hi,
    I've always struggled with HDPE, its soft enough but forms long curls rather than chips. It's also very prone to re-melting and welding itself
    back to the parent material. Careful choice of feeds and speeds are required, and I find flood cooling helps with the heat problem.
    Cutting in small discrete steps, a bit like peck drilling maybe helpful too.

    Craig



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