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PVC glueing question

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IC

08-28-2001 18:31:18




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I have a couple of questions on PVC glueing and the Purple primer/cleaner. Do you need to use glue and primer/cleaner on both pieces to glue the pipe together or is one side good enough for the glue and prime/clean both pieces ?

The other question is the primer, what does it do? I have seen a lot of PVC glued together without it and have not seen any problems. Is this some product the plumbing places are pushing or will it help out on the joints. They told me it helps clean the joint before applying the glue. That does not make sense to me because you are not wiping anything off just applying the glue on top. Any help would be appreciated. Thanks in advance !

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RandyB

08-29-2001 08:57:16




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 Re: PVC glueing question in reply to IC, 08-28-2001 18:31:18  
You might want to read this.
PVC



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rhudson

08-28-2001 22:31:09




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 Re: PVC glueing question in reply to IC, 08-28-2001 18:31:18  
can't add much to what has already been said. fittings may have mold release compound from production process so i'd say even if it looks clean, prime it. inspectors in our area want to see primer. fittings for the last 15 years or so have been made with a female taper. so after putting fittings on, hold in place for about 15 seconds so the pipe does not get pushed out. dip swab or brush in solvent, coat pipe, then female fitting, recoat swab, coat pipe again, assemble. most of female side solvent will be pushed inside fitting and may cause cavitation. thats why light coat on female side. anyway, all this from a $750 NTT seminar.

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Joe Evans

08-28-2001 20:12:43




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 Re: PVC glueing question in reply to IC, 08-28-2001 18:31:18  
IC: the method of joining together plastic pipe and fittings (PVC, CPVC and ABS) with glue is called "solvent weld". The cement used in this process is a powerful solvent that slightly dissolves or melts the plastic pipe and fittings. When these parts are joined, the semi-fluid surface material of the fitting and pipe intermingle and then fuse together when the joint is dry. This is a chemical method of pipe joining. Some plastic piping systems cannot be glued such as the orange polyethylene pipe and fittings used for gas line work. Here, heat is used to to make the joining surfaces of the parts fluid. When working with PVC and CPVC, a primer is used on the pipe and the socket of the fitting. The primer is also a powerful solvent, almost alway methylene chloride. It cleans away any oily residue from the surface and dissolves away the glazy finish on PVC and CPVC pipe and fittings allowing the cement to work on very virgin material. Notice how tacky the pipe feels after priming? The primer is very volatile and does not keep the joining surfaces fluid for making up a joint. The cement also acts as a filler. Typically, ABS piping does not need a primer and can be joined in one step--just apply cement. There are some tricks we use to join very large diameter PVC. We have found that using a CPVC cement on large diameter PVC fittings allows us a slower set time thus permitting the aligning or "two-holing" of the fittings before the joint siezes. There is no loss in joint integrity either. I would not want to trust an un-primed PVC or CPVC joint in a pressure application. By the way, PVC primer is a great solvent for cleaning up an old paint gun--soak the parts overnight, and you can just about wipe off all the old stubborn paint residue with a rag. Keep the primer away from plastic screwdriver handles!

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Ford Man

08-28-2001 19:57:03




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 Re: PVC glueing question in reply to IC, 08-28-2001 18:31:18  
I have always cleaned and applied glue to both pieces . Be sure to give the joint a quarter turn to evenly distribute the glue .

There are two types of glue that I know of . 1 requires the cleaner and the other is clear and is used alone .

I have been told , but cannot confirm , that our plumbing inspectors will not pass PVC if they do not see the purple primer .

Just my .02 worth .

Ford Man

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