Key takeaways:
PVC cement makes a chemical weld, not a simple glue joint.
Pureseal cements and primers are designed for PVC and ABS, with WaterMark certification and AS/NZS compliance.
Match Type P or Type N to pressure vs non-pressure systems.
Correct surface prep and set time are key to leak-free results.
Plumbers routinely apply PVC pipe cement, but unlike standard adhesives, it works by softening and fusing the plastic at a molecular level to create a true chemical weld, not just a surface bond.
Soudal’s Pureseal PVC Pipe Cements (Type N and Type P) and Pureseal PVC Priming Fluid are available across Australia, helping plumbers fuse PVC or ABS pipes and fittings for leak-free, long-lasting results.
How PVC Pipe Cement Works at a Molecular Level
Also known as solvent welding, PVC pipe cement works very differently from adhesive bonding such as polyurethane or epoxy. Using Pureseal PVC Priming Fluid is the key, it removes the glossy finish, cleans the surface, and softens the pipe before cement application.
When Pureseal PVC Pipe Cement is applied and the parts are pressed together, the solvent breaks down the PVC surface layer, allowing polymer chains to intermingle. As the solvent evaporates, the joint hardens into a single piece of PVC, forming a strong, watertight bond that’s effectively part of the pipe itself.
In contrast, standard adhesives only cure on the surface and bond two separate materials together, rather than fusing them into one.
The Role of PVC Priming Fluid in Solvent Welding
Priming fluid is the most important step in achieving a strong chemical weld. Remove burrs, sharp edges, and debris before applying primer to both surfaces. This ensures full contact and prevents weak spots.
Once primed and cemented, support the joint firmly for at least 30 seconds to avoid movement while the weld forms. For larger pipe diameters, use straps or pullers to hold joints steady. After assembly, wipe away any excess cement for a neat finish.
For long-term durability, ensure pipes are properly supported to minimise vibration or movement once water pressure is applied.
Best Practices for Applying PVC Pipe Cement and Priming Fluid
Soudal products are built for professional use, combining strength and reliability with WaterMark certification. Correct preparation and curing are key: cut cleanly, deburr, dry-fit, prime (if required), cement, and hold joints still while curing.
Learn more with our product information, useful articles and ‘how to’ videos.
Contact us for system matching, or find your nearest stockist for Pureseal cements and primers.
PVC Pipe Cement FAQs
Do I need primer on every joint?
Use primer where specified by the manufacturer or required by the system standard. It improves weld integrity, especially on large diameters or cold conditions.
How long before I can pressure-test the line?
Typical wait times range from 30 minutes to 24 hours depending on pipe size, temperature, and pressure. Always follow the product instructions.
Can I use Type N cement on pressure lines?
No. Type N is designed for non-pressure systems. Use Type P cement for pressure applications.
Is PVC cement safe for potable water?
Yes, when using WaterMark-approved cement and primer rated for potable water. Keep batch numbers and approvals for compliance records.
What is the correct surface preparation?
Dry-fit, clean, deburr, prime if needed, apply an even coat of cement to both pipe and fitting, insert fully with a quarter-turn, and hold for at least 30 seconds.