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Thread: PVC primer/cement not hardening

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    DIY Junior Member suffer103's Avatar
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    Default PVC primer/cement not hardening

    So I replaced a PVC closet flange yesterday. Today I wanted to make sure the joints were hardened before putting the toilet back on. So I was gently pushing on the excess primer/cement near the joints with a small screwdriver to make sure they were hardened.

    Its tough to tell in most spots, but where ever I got a bit of excess I could tell that I can easily push on this excess with the screwdriver. I was expecting it to be rock hard.

    I used a standard purple primer with a general purpose schedule 40/80 cement. Note that my PVC is schedule 30 (which I understand is just thin wall schedule 40).

    Am I doing something wrong? Its been 24 hours now.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The cement, as opposed to a glue, actually is a mix of solvents and pvc disolved in it. It literally melts the pipe and fitting and has a little extra body to fill in. It doesn't resolidify until all of the solvents have evaporated. My guess is that you couldn't pull the joint apart. It should be fine. Try not to use excessive amounts.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member suffer103's Avatar
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    I gave it a decent tug and couldn't budge them.

    Great info thanks. That's a load off my mind...and hopefully one soon through my new flange.

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    Moderator & Master Plumber hj's Avatar
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    Sch. 30 pipe has an "actual i.d. of 3.0", which it has to have to maintain a smooth bore if used with ANY other DWV material. BUT, it has an o.d. of 3.25", which is too small to fit any sch. 40 or 80 fittings. It ONLY fits sch. 30 fittings which are not compatible with any other grade. That being the case, HOW did you attach a flange to the pipe and get any kind of proper connection.
    Licensed residential and commercial plumber

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    DIY Junior Member suffer103's Avatar
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    Originally - The schedule 30 pipe goes into a 90 elbow. They had a flange to exact fit the elbow.

    New one I installed. - I cut off the elbow, then I added two 45 elbows instead of a 90, to create a longer sweep. There was a special flange at Lowe's to fit into the 2nd elbow around the outside of the elbow. Fit perfectly.

    Edit: I'll add, most of the flange's at Lowe's would not fit (probably because they were for schedule 40 pipe).
    http://www.lowes.com/pd_104527-322-6...ontent=Default
    Last edited by suffer103; 09-23-2012 at 04:38 PM.

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    In the Trades Tom Sawyer's Avatar
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    My head aches
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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