What PVC Cement Dries Yellow?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by SAS, Feb 5, 2014.

  1. SAS

    SAS Member

    Messages:
    117
    Location:
    Connecticut
    I've discovered that the prior owner of my new house did a lot of work himself, and not all of it is well done. Since I know a bit more about electrical work, I have a pretty good sense of some of the things I'll need to re-do. With plumbing I'm not too sure. The home inspector pointed out a couple of things, but I noticed that the PVC pipes he put in all have yellow cement on them. I'm used to seeing the purple primer stain on the pipe. Did he use the right stuff?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,125
    Location:
    Bothell, Washington
    Inside a home it's CPVC, which is off white.
    PVC can only be used outside, typically underground.

    I've seen yellow glue for CPVC.
  3. SAS

    SAS Member

    Messages:
    117
    Location:
    Connecticut
    I just went downstairs and took a look. The supply pipes are all, as you said, CPVC. The waste lines, however, are PVC, and they also have the same yellow cement.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,139
    Location:
    New England
    CPVC cement can typically be used on PVC, but not the other way around. Because the CPVC cement is stronger, it may take a bit longer for the PVC joint to harden up, but it will still work. Some inspectors like to see the purple cleaner, but that comes in clear as well.
  5. Caduceus

    Caduceus Master Plumber

    Messages:
    136
    Location:
    Pittsburgh, PA
    There are differences in the glue's chemical make up and how they should be used. CPVC glue will not solvent weld and bond to PVC. It may stick for a long time, but will eventually leak through. Just like the universal cpvc,pvc, and abs glue sold at big box stores. There is really no such thing as a universal or cross-material glue.
  6. mikeplummer

    mikeplummer Plumber

    Messages:
    190
    Location:
    Ontario, Canada
    so you say transition glues are incorrect?
  7. Caduceus

    Caduceus Master Plumber

    Messages:
    136
    Location:
    Pittsburgh, PA
    If a glue is promoted as a product that can solvent weld ABS to PVC, CPVC to PVC or combinations, then it is deceptive. By our code, it must be a solvent weld and those products cannot provide a true solvent weld between two differing materials. They may glue and bond, but it isn't a solvent weld.
    In my own experiences I have repaired many leaks that were caused by transition glues and universal glues done by home owners and handymen....even some plumbers.
    Look where some of the deception starts. You can go to some big box and hardware stores that show on the aisles "PVC and Black PVC Pipe" and stock mostly universal glue to control inventory.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    quote; then it is deceptive.

    1. Transition glues are not approved by most codes
    2. Most transition glues specify they are not for pressure systems.
    3. The gas utility companies are NOT under "most codes"3
    4. Our utility company ALWAYS used a "standard green" transition glue to join their ABS and PVC high pressure gas lines.
    5. So that pretty much destroys any arguments about transition glues, at least until something blows up, which has not happened so far.
  9. Caduceus

    Caduceus Master Plumber

    Messages:
    136
    Location:
    Pittsburgh, PA
    So is your argument that transition glues are good or bad for joining dissimilar materials?
  10. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,057
    Location:
    NW Ontario, Canada
    I've seen yellow glue for ABS.
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