The number one reason for joint failures in the field is improper installation technique. Because solvent-cement welding is a chemical process, temperature and moisture variations present challenges during application. With fall and winter on the way, here are 4 tips to ensure successful joints during colder, wetter months:
1. Use the right product.
You need a low viscosity, fast-setting solvent cement to cut down on inevitably longer set and cure times. Weld-On® 725™ Wet 'R Dry™ is a great option because it is medium bodied and sets extremely fast. Weld-On P-70™ Primer’s job is to soften the components, which is even more critical when colder temperatures harden the pipes and fittings. You can confirm that the PVC is sufficiently primed by gently scraping the treated surface with a blade. If a small amount of plastic material is effortlessly removed, you’re ready to apply the solvent cement.
2. Store your solvent cement in a warm location.
Primer and cement begin to gel when stored in colder temperatures. Keep them fluid by storing your main supply in a warm location (40°F / 4ºC) and taking smaller amounts to the jobsite. Solvent cement can be reconstituted by sitting in a warmer environment (60°F-90°F / 15ºC-32ºC) for 24 hours. Be sure to shake vigorously before using, and never try to rush the process with artificial heat. It’s best when pipes, fittings and valves are roughly the same temperature at the time of install, so when possible, store them together the night before.
3. Follow set and cure times.
Don’t skimp on allowing for the proper set and cure times for your specific installation environment. Factors include pipe size, material type and temperature. In general, colder environments require much longer set and cure times. Average set and cure times for 40-60 degrees are outlined on your Weld-On can label, but we also recommend you reference Weld-On’s Average Set and Cure Time Chart for temperature, pipe size and other variables.
4. Keep the surfaces dry.
Take special care to remove moisture (including any condensation, ice or snow) from each surface. Any amount of moisture in the joint can compromise the chemical integrity of the bond.
Conclusion:
The good news is that it’s possible to form solid, reliable PVC joints in cold, wet environments. Installers who understand the impacts of cold, wet weather on the solvent welding process are far more likely to create long-lasting connections.
Interested in getting your Bonder Qualification? Let us know and we’ll let you know when we’re offering an IPS ASME B31.3 Solvent Welding Seminar in your area.
Got questions?
Cimco Office:
Phone: (253) 845 - 4050
office@cimcopnw.com
Hours of operation: 8 am to 4:30 pm - Monday through Friday