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Thread: gluing CPVC

  1. #1
    DIY Member Amopower's Avatar
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    Default gluing CPVC

    Does the orange CPVC cement need to be applied right after the purple primer is put on, or can the purple primer be on the pipe for a couple days or more, then put the orange cement on? The directions didnt seem to clear on whether or not the gluing had to happen immediately after the primer.

  2. #2
    Master Plumber Dunbar Plumbing's Avatar
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    Applying glue immediately after primer prepares the two surfaces to be glued.

    I've never heard of a delay of 2 days before glue is applied.
    Read what the end of this sentence means.

  3. #3
    DIY Member Amopower's Avatar
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    I didnt mean that I had to wait the two days, I was just wondering if there would be any harm in doing so. I've been taking my time with a project, so that's why I asked. I'm mounting some pipes near the ceiling in the garage and was going to prime all of them at "ground level" and then glue them together when I felt like it. Sounds like it has to be immediate (then again its probably immediate for most plumbers because they dont have the need to take their time and space things out like a homeowner can).
    Last edited by Amopower; 11-15-2006 at 06:04 PM.

  4. #4
    Master Plumber Dunbar Plumbing's Avatar
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    That primer actually softens the two components so you would still have to use primer at time of fitting, otherwise you'll have a tough time getting them together.
    Read what the end of this sentence means.

  5. #5
    In the Trades Gary Swart's Avatar
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    I'm not CPVC experienced, but with regular white PVC, you prime then apply the solvent as soon as the primer has dried. I would assume (dangerous to do) that CPVC would be treated the same.

  6. #6
    DIY Member Amopower's Avatar
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    OK guys thanks for the advice.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    Default primer

    You have to apply the cement while the primer is liquid.

  8. #8
    In the Trades kordts's Avatar
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    I second hj, the primer softens the surfaces, so you apply the cement while the primer is still wet. If the primer dries, it makes a "skin" which prevents a really good joint. Since most pvc DWV systems are never under pressure, unless a line clogs, then it's just head pressure, very few systems leak, even though the joints were made properly. However, I have seen a lot of plumbing where it's just the interference fit that keeps it from leaking.

  9. #9
    Plumber Cass's Avatar
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    Here is a link to proper cementing techniques.

    http://www.ppfahome.org/cements/index.html

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