Weld-On® Primer & PVC & CPVC Solvent Cement

News

Weld-On® Primer & PVC & CPVC Solvent Cement

Complete Guide to Stronger Solvent-Welded Pipe Joints

When installing PVC or CPVC piping systems, the strength of the system depends on the strength of the joint.

Proper PVC solvent cement, CPVC solvent cement, and primer selection directly impacts performance, pressure integrity, and long-term reliability. Whether you’re working on industrial process piping, chemical service systems, water treatment, or irrigation, choosing the correct Weld-On® product ensures a true solvent weld — not just a glued connection.

Fabco Plastics stocks a full range of Weld-On® primers, PVC cement, CPVC cement, and repair adhesives at our Acheson location to support contractors, maintenance teams, and engineers across Western Canada.

What Is Solvent Welding?

Solvent welding is a chemical process that softens and fuses PVC or CPVC pipe and fittings together, creating a single continuous piece of material once cured.

Unlike glue, PVC solvent cement chemically bonds the materials together, forming a pressure-rated joint when properly installed.

However, performance depends on two critical components:

Proper surface preparation using PVC or CPVC primer
Selecting the correct cement body and set speed for the application

Skipping primer or using the wrong cement increases the risk of:

Dry joints
Push-out
Leaks under pressure
Joint failure in chemical environments

Why PVC Primer Is Required for Most Installations

Primer prepares the pipe surface by softening and cleaning it before cement application.

Weld-On® P-70™ Primer (Low VOC)

Recommended for:

Schedule 80 PVC and CPVC
Large-diameter pipe
Cold weather installations
Industrial applications

Using a high-quality primer like Weld-On® P-70 improves fusion depth and reduces joint failure risk.

Properly primed PVC fitting socket ready for solvent cement.

Choosing the Right PVC Solvent Cement

Different project conditions require different cement viscosities (body) and set times.

Weld-On® 705™ PVC Cement

Medium Bodied / Fast Set / Low VOC

Best for:

General industrial PVC systems
Irrigation piping
DWV applications
Electrical conduit
Pool and spa systems

Ideal when fast handling strength is required.

Weld-On® 711™ PVC Cement

Heavy Bodied / Medium Set / Low VOC

Best for:

Industrial PVC systems
Schedule 80 pipe
Installations requiring better gap filling
Pipe sizes through 12″

Provides additional working time and stronger fill capacity.

Weld-On® 719™ PVC Cement

Extra Heavy Bodied / Slow Set / Low VOC

Best for:

Large-diameter PVC pipe
Fabrication work
Maximum gap-filling requirements
Schedule 80 through 30″

Designed for high-strength industrial installations.

Weld-On® 725™ Wet ’R Dry™ PVC Cement

Medium Bodied / Extremely Fast Set / Low VOC

Best for:

Wet conditions
Emergency repairs
Quick system pressurization
Maintenance shutdown work

If you’re searching for wet PVC cement, 725™ is specifically formulated for that environment.

Weld-On PVC solvent cement options including 705, 711, 719 and 725.

CPVC Solvent Cement for Hot Water & Chemical Service

CPVC systems require specialized solvent cement, especially in high-temperature or chemical applications.

Weld-On® 714™ CPVC Cement

Heavy Bodied / Medium Set / Low VOC

Recommended for:

Hot and cold water CPVC systems
Mechanical rooms
Non-chemical service applications
Corzan® CPVC systems
Pipe sizes through 12″

Weld-On® 724™ / 724HB™ CPVC Cement

Heavy Bodied / Medium Set / Ultra Low VOC

Best choice for:

Chemical-resistant CPVC systems
Industrial process piping
Acids, bases, salts, hypochlorites
Wastewater treatment plants
Chemical manufacturing facilities

Weld-On® 724 is widely specified for CPVC cement for chemical service applications and can also be used on certain industrial PVC systems in chemical environments (per manufacturer guidance).

CPVC chemical service piping installed in industrial facility.

PVC & CPVC Repair Adhesives for Fabrication and Maintenance

Some applications require more than standard solvent welding.

Weld-On® 810™ (A & B Kit)

Ideal for:

Crack repair
Leak repair
Saddle fabrication
Large-diameter bonding
Gap-filling repairs

Weld-On® 845™ Cartridge

Best for:

High-strength structural bonding
Wet conditions
Heavy gap filling
Industrial maintenance

These two-part reactive adhesives provide structural reinforcement where solvent cement alone is not suitable.

Solvent Welding Training & Bonder Certificate – Fabco Acheson

Product selection is only half the equation. Proper installation technique prevents joint failures and costly rework.

Fabco Acheson offers Weld-On® solvent welding and bonder certificate training, focused on:

Correct PVC and CPVC joint preparation
Cement body selection
Avoiding dry joints and push-out
Best practices for cold weather solvent welding
Large-diameter installation techniques

Training may include hands-on qualification concepts aligned with B31.3 practices, including objective pressure testing.

Contact Fabco Acheson to schedule your next training session.

Frequently Asked Questions About PVC & CPVC Solvent Cement

Is primer required for PVC solvent welding?

Yes. Primer is required for most pressure-rated PVC and CPVC installations unless local code and manufacturer instructions specifically allow otherwise.

What is the best PVC cement for wet conditions?

Weld-On® 725™ Wet ’R Dry™ is formulated specifically for wet environments and quick pressurization.

What CPVC cement is recommended for chemical service?

Weld-On® 724™ CPVC cement is formulated for industrial chemical resistance.

What cement is best for Schedule 80 PVC?

Weld-On® 711™ or 719™ are typically recommended depending on pipe size and working time required.

Need Help Selecting the Right PVC or CPVC Cement?

Tell us: