Types of Cement

[Unregistered]

I work in a big box store and I get lots of questions on the type of cements to use for PVC, CPVC, etc. Where can I find recommendations?

2. On transitions from cast iron to PVC do you use anything on the transition sleeve?

Thanks

[DUNBAR PLUMBER]

No cement is used on mission/fernco couplings. (rubber)


Glues are specific for the material they are bonding.


Numerous types of glue for a specific type of piping will be used for time-setting features.


You cannot use the wrong glue for the pipe it wasn't designed for. The bond will break, eventually.



The green cans for PVC glue are the fastest setting glue, with a bonding time that goes quickly. Brown cans give you time to think about pulling the joint back apart if something isn't quite right.


All PVC piping that I am aware of need the use of a PRIMER before making up a solvent-weld joint.

[mdshunk]

Dunbar...

I was on a project recently and saw a plumber (old timer) gluing up CPVC water lines with yellow labeled glue (oatey) with out using primer. I noticed this and questioned him. He told me that the yellow label glue doesn't require primer, and he has been using it with much success for some time. Ever heard of this?

[DUNBAR PLUMBER]

That glue he was using was exclusive to CPVC Flowguard Gold.


It looks like egg yolks before you would make scrambled eggs.


It is a combination of both cleaner and glue, the consistency is runny.

I am not fond of plastic piping; I am a true blue copper man. :D


CPVC Glue and SCH 80 piping carry different requirements for the glue to be used.


I use the Fast Set Glue with Oatey Yellow Cleaner.

[mdshunk]

Well then, to further this subject:

It is fairly clear that ABS and PVC require different glues. I had been told in the past that there is no glue that is compatible with both. Is this still true? I have also been told that when transitioning from ABS to PVC, one must do so by mechanical connection alone (ie., no solvent welds). Is this still true? How is a mechanical connection from ABS to PVC accomplished? Fernco? ABS male adapter screwed into a PVC female adapter? Somthing totally different?

I saw a home improvement show one time where the plumber mixed the primer into the glue can, and used it as a "one shot" operation. Ever heard of this? Sounded really out in left field to me.

-Just an electrician that wonders about stuff.

[DUNBAR PLUMBER]

Yes, threaded connection where code allows this type of conjoining of dissimilar materials.


You cannot even buy ABS piping or fittings in my area anymore, no big box stores, no supply houses.


The trick with diluting glue and cleaner is not recommended, I do know for electrical conduit they make a gray glue that works in this fashion, but no pressure or wastewater is the issue with conduit.


Inspectors catch an installer using glue only on PVC piping, whether water or drain, they will have you remove the entire system and do it all over again.



Priming a solvent weld joint is crucial to prepare the two surfaces to be joined in order to allow glue to properly join the the two plastics together.