CPVC to PVC bonding

[jeffr47]

The adapters on my new pump are CPVC, but my existing plumbing is PVC. Do I need to get a PVC-to-CPVC adapter, or is there a glue that will make a strong bond between these two plastics?

 

[JamesW]

Regular pvc glue is fine.

 

[Maurino17]

The adapters on my new pump are CPVC, but my existing plumbing is PVC. Do I need to get a PVC-to-CPVC adapter, or is there a glue that will make a strong bond between these two plastics?

Just found your post searching for same question. I’m hard plumbing all my equipment for first time and realized as well my check valve is CPVC. The Otey glue says works on all PVCs so I think we’re good.

I think my Hayward adapters are ABS and I did now see an ABS to PVC cement but it aleady used the regular PVC cement. I just finished tonight and starting up pump tomorrow so I guess I’ll find out.

 

[jeffr47]

The Oatey glue says their All Purpose Cement can be used on PVC and CPVC, but that it cannot be used to bond PVC to CPVC.

From their website:
Can I use All Purpose Cement to join PVC to CPVC?

No. It is not recommended because it takes longer for CPVC to finish the curing process necessary to complete a strong bond after the cement is applied. CPVC is also rated for hot water use which will affect cure times. PVC is not rated for hot water temperatures.

--
Now, whether that is a legit issue for pool applications is different. Seems like many people do it without trouble. Possibly the bond is strong enough, just not optimal. And perhaps this is a case of Oatey invoking 'cya'.

 

[Maurino17]

The Oatey glue says their All Purpose Cement can be used on PVC and CPVC, but that it cannot be used to bond PVC to CPVC.

From their website:
Can I use All Purpose Cement to join PVC to CPVC?

No. It is not recommended because it takes longer for CPVC to finish the curing process necessary to complete a strong bond after the cement is applied. CPVC is also rated for hot water use which will affect cure times. PVC is not rated for hot water temperatures.

--
Now, whether that is a legit issue for pool applications is different. Seems like many people do it without trouble. Possibly the bond is strong enough, just not optimal. And perhaps this is a case of Oatey invoking 'cya'.

thanks this sure does make it confusing for a DIY'er to glue up some parts lol

 

[jeffr47]

You're welcome? ?

Seems like most people use PVC glue to bond CPVC to PVC on their pools without trouble, so I guess we'll be fine!

 

[Pool_Medic]

You can buy cpvc to pvc transition glue, also the primer. Most of Hayward top end pumps have cpvc fittings.

 

[jeffr47]

Pool_Medic - have a link to the CPVC/PVC transition glue? I haven't been able to find such a product.

 

[JamesW]

Oatey-All-Purpose-Cement | Oatey

Oatey-EP42-CPVC-HD-Gray-Industrial-Cement | Oatey

 

[jeffr47]

Oatey-All-Purpose-Cement is the cement I mentioned above - Oatey says it should not be used to bond PVC to CPVC. However, it appears that plenty of people have used it for that purpose without adverse effects.

 

[JamesW]

If it's a critical, high pressure application, then you probably can't join pvc to cpvc.

For pool use, regular pvc glue or cpvc glue works just fine as long as you give it plenty of time to dry.

 

[Pool_Medic]

Any heavy medium body glue will work. i was remiss, I only use cpvc to pvc transition primer, then I hit both with the medium body glue. Inside the Union i coat around it so there is no gap between the pvc pipe and the cpvc fitting. CPVC is used because it can withstand higher temps than pvc.

 

[jeffr47]

For the primer, do you use Oatey Purple or something else?

 

[Rich D]

Purple primer is only colored so inspectors or any one else can tell primer was used. If you are not very careful it can be messy looking. I always use clear.

 

[sktn77a]

I used PVC cement to connect ABS to CPVC to PVC about 15 years ago and it held up just fine. Last year I used special, dedicated ABS to PVC glue, CPVC to PVC glue and not much difference. One of the CPVC to PVC joints (with "special" CPVC cement) failed. I'd just use primer and PVC cement on everything.

 

[Maurino17]

So happy to see all the replies because I don’t know how I am supposed to be able to tell anyway if the black unions are CPVC or ABS or just PVC.