Can You Use CPVC Glue On PVC? (7 Facts To Know)

CPVC and PVC are two popular materials commonly used for plumbing works. 

Both are made of the same basic elements and are heavily used in piping systems. But they are not the same material, so they may not always work with the same adhesive.

If you’re thinking about using CPVC glue for PVC, you may be worried about compatibility and whether the bond will hold. That’s completely normal and shows you’re in the right direction. 

can you use cpvc glue on pvc

Can you use CPVC glue on PVC?

Yes, you can use CPVC glue on PVC as long as you use the right product. Even though they are different products, CPVC can form a strong bond with PVC pipes, provided you use a CPVC glue specifically designed for PVC. Ensure the surface is clean and free of moisture before applying the glue. 

Difference Between PVC and CPVC Glue

The main difference between PVC and CPVC glue can be seen in their composition. PVC glue is typically made with solvent cement and is designed for use on regular PVC pipes, while CPVC glue is made for CPVC pipes.

While it is generally safe to use CPVC glue on PVC pipes, it’s not recommended to use PVC glue on CPVC pipes. This is because CPVC pipes are usually subjected to high temperatures, and you need a glue that can withstand such high temperatures. 

Unfortunately, PVC glue is made for colder environments, which is the case with PVC pipes. Using it for hot water systems will often result in a weaker bond, which can lead to leaks or failure over time.

What is the best CPVC glue for PVC pipe?

Here are my top recommendations for the best CPVC glue to use on PVC pipe:

  • Oatey Clear CPVC Cement: Oatey is a well-known brand for plumbing products, and their CPVC cement is widely used for both CPVC and PVC pipes. It typically dries quickly and forms a strong bond. It works for pressure pipes, conduits, and DWC. For the best results, ensure temperature is 40-110 degrees F when applying the cement. 
  • Christy’s Red Hot Blue Glue: While this cement is primarily targeted toward PVC pipes, it is also known to be effective for joining CPVC to PVC. Like Oatey, it sets very quickly and offers excellent durability. It may take up to 24 hours to fully cure, depending on the size of the pipe. 
  • Weld-On 711 PVC Cement: Weld-On is commonly used in plumbing systems and is suitable for both PVC and CPVC pipes. It offers a strong bond and can be used to fill gaps. With its medium setting, it gives you more working time in warm weather. Being low VOC also makes it safer to use. 

Will CPVC Glue Work Without Primer?

For regular CPVC pipe installations, using a primer is highly recommended. The primer helps to soften and clean the surface, ensuring better adhesion and a more robust joint.

However, when it comes to joining CPVC to PVC, some manufacturers offer CPVC glues that work without the need for a primer. 

In general, the primer requirement for each CPVC glue will differ depending on the brand and composition. Always read the label to know whether you need a primer or not for each application.  

How to Apply CPVC Glue on PVC (Step-by-Step Guide)

In order to create a strong and lasting joint, follow these steps to apply CPVC glue on PVC. 

Prepare the surface 

Start by making sure the pipes (whether it’s CPVC, PVC, or CPVC to PVC) are clean. You can wash with a soapy solution to remove all dirt and debris, then rinse with warm, clean water. Use a clean, dry cloth to wipe off the moisture and let it air dry. 

NB: The pipes should be cut to shape before you begin. 

Fit the Pipes

Insert the CPVC (or PVC) pipe into the PVC fitting, making sure it is properly aligned. A secure and snug fit is essential for a leak-free connection.

Apply the Glue

With the pipes fitted together, apply a good amount of CPVC glue to the outside of the CPVC pipe, where it will come into contact with the PVC fitting. Use a brush or applicator that comes with the glue for even distribution.

Join the Pipes

Quickly insert the CPVC pipe into the PVC fitting while the glue is still wet. Make sure to push the pipe in fully, leaving no gaps or spaces between the pipe and the fitting.

Hold Firmly

Hold the pipes in place for a few seconds to allow the adhesive to bond properly. Follow the specific time recommendations by the manufacturer. You will find instructions on the product label or the company’s website. 

Wipe Off Excess Glue

Use a clean cloth to wipe off any excess glue that might have squeezed out during the joining process. This will result in a cleaner finish and prevent hardened glue from causing obstructions.

How Long Does It Take for CPVC Glue to Dry?

Like most adhesives, CPVC glue typically cures in 12 to 24 hours. This may vary for each product. You should also apply the glue lightly (thick coats will increase the drying time) and work when humidity and temperature are moderate. 

For instance, the glue generally takes longer to dry when humidity is low. Similarly, at temperatures under 40 degrees, it may take up to two days to fully cure. For the best results, temperatures should be 60-120 degrees F. 

In general, the glue sets very quickly, usually within a few minutes. It’s crucial the pipes are undisturbed for a minimum of 30 minutes to ensure a strong bond. 

How Long Does CPVC Glue Last on PVC?

When applied correctly, the bond created by CPVC glue on PVC pipes is usually strong and can last for many years without any issues. However, longevity can be influenced by chemical exposure, temperature, and pressure. This is why you’ll need to inspect the joints occasionally to identify potential issues when they arise. 

How Long Does CPVC Primer Take to Dry?

The drying time of CPVC primer is similar to CPVC glue. It typically sets within a few minutes, but it’s essential to allow sufficient time for the primer to work effectively. Waiting for at least 30 minutes before joining the pipes is recommended. It’s a good idea to check the label to know exactly how long you need to wait. Typically, most CPVC primers will take 12 to 24 hours to fully cure. 

How to Remove CPVC Glue from PVC

Accidental spills or incorrect application of CPVC glue might require you to remove excess adhesive from the PVC surface. Follow these steps to remove CPVC glue from PVC pipes:

Method 1: Wipe off the Glue 

If the glue is still wet, quickly wipe it off using a clean cloth or rag. Avoid spreading the glue to unaffected areas.

Method 2: Mechanical Removal

If the glue has dried, you can use a utility knife or scraper to gently remove the excess glue from the PVC surface. Scrape gently in order not to damage the pipe or fitting during this process.

Method 3: Solvent Cleaners

There are solvent-based adhesive removers available that can help soften and dissolve the glue. However, these chemicals can potentially damage the PVC, so use them sparingly and follow the product instructions carefully. A good example of such a product is the Oatey Clear Cleaner.

Method 4: Sanding

In some cases, sanding the affected area might be necessary to remove stubborn glue residue. Start with fine-grit sandpaper and gradually move to coarser ones if needed. Afterward, clean the surface thoroughly to remove any debris from sanding.

Summary: Will CPVC Glue Work on PVC?

In conclusion, CPVC glue can effectively bond with PVC pipes, making it a good option for joining the two materials. 

However, it’s important you use the right CPVC glue. Ideally, it should be one specifically designed for PVC applications to ensure a reliable and long-lasting connection. 

In addition, while some specialized CPVC glues might work without a primer, it is generally recommended to use one for regular CPVC pipe installations.