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Thread: HDP vs. HDPE

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    Procrastinator beak81champ's Avatar
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    HDP vs. HDPE

    Are High Density Plastic and High Density Polyethylene interchangeable? I'm referring to them being used as speaker spacer rings for door mounted mids. I have never seen nor used either one, just that there is a huge price difference. Is this a better material than MDF for spacers in doors. Sorry if this is an elementary question. Thanks for any info!

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    Team Knuckledragger papacueball's Avatar
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    Re: HDP vs. HDPE

    HDPE is the only plastic I have used for speaker rings. I'm not sure if the high density plastic is the same thing or not. The HDPE should last indefinitely in a car door, where MDF would need to be coated with something (like fiberglass resin). It won't last forever, but should last until you decide to change your speakers the next time.

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    Re: HDP vs. HDPE

    Go to Wally World and get some white cutting boards. Like $10-12 for a piece big enough to do two 6.5's or 8's.

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    Re: HDP vs. HDPE

    Quote Originally Posted by beak81champ View Post
    Are High Density Plastic and High Density Polyethylene interchangeable? I'm referring to them being used as speaker spacer rings for door mounted mids. I have never seen nor used either one, just that there is a huge price difference. Is this a better material than MDF for spacers in doors. Sorry if this is an elementary question. Thanks for any info!
    I will never use wood products in a door again. I haven't used mdf at all in years.

    HDPE is polyethylene. Which is plastic. So they could be the same thing.

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    Re: HDP vs. HDPE

    Is high density plastic refering to acrylic or lexan?

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    Re: HDP vs. HDPE

    Quote Originally Posted by diy.phil View Post
    Is high density plastic refering to acrylic or lexan?
    Neither.
    https://www.acplasticsinc.com/inform...-they-are-used

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    Noob Ge0's Avatar
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    Re: HDP vs. HDPE

    Quote Originally Posted by DaveG View Post
    Go to Wally World and get some white cutting boards. Like $10-12 for a piece big enough to do two 6.5's or 8's.
    Yep. $30 in materials from Target or Wally World and an afternoon of making a mess with plastic shavings
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    If I remember correctly these are about 1/4" thick. Just need to glue, screw, and stack them:

    https://www.amazon.com/Farberware-No...8892922&sr=8-9

    Ge0
    Last edited by Ge0; 05-07-2020 at 06:11 PM.
    Scanspeak - Dynaudio - Helix - Bose

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    Re: HDP vs. HDPE

    Did you glue them together.

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    Noob Ge0's Avatar
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    Re: HDP vs. HDPE

    Quote Originally Posted by dgage View Post
    Did you glue them together.
    Glued and screwed with short drywall screws. I wasn't sure if the glue would hold. As it turns out the glue was fine. It chemically bonded the rings together. Now if I could only remember what glue???

    Ge0
    Scanspeak - Dynaudio - Helix - Bose

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    Re: HDP vs. HDPE

    Quote Originally Posted by Ge0 View Post
    Now if I could only remember what glue???
    You beat me to the question.

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