Solvent-weld joints

Entry in Joining methods · Updated October 29, 2026 · Written by the Know Your Pipes editors from the sources listed under References

A solvent weld joins PVC, CPVC or ABS pipe to a socket fitting with a solvent cement that softens both plastic surfaces so they fuse into a single continuous piece rather than being held by a layer of glue.^[1] At least one major maker of all three pipes recommends socket solvent cementing over threads, flanges or grooving where it applies.^[6]

The joint is often called "gluing," but no adhesive film is left between the parts. Cement, primer and the pipe material have to match, and each has its own ASTM standard.

1 Cement and primer standards

Each plastic needs its own cement formulation.^[1] PVC cement is made to ASTM D2564, which points to ASTM D2855 for the two-step (primer then cement) joining practice.^[2] CPVC cement is made to ASTM F493^[4] and ABS cement to ASTM D2235, which covers both pressure and non-pressure ABS systems.^[5] Primer for PVC and CPVC is made to ASTM F656 and prepares the pipe and fitting surface before the cement goes on.^[3]

Some codes require tinted primer so an inspector can see it was used. Massachusetts, for example, requires purple primer, with an exception for clear primer that shows under ultraviolet light.^[9] See PVC Schedule 40, CPVC pipe and ABS pipe for the pipes themselves.

2 Set and cure

"Set" is the time before a joint can be handled carefully; "cure" is the time before the line can be pressurized. One cement maker's chart gives an average initial set of 2 minutes for 1/2 to 1-1/4 in pipe at 60–100°F, and a cure of 15 minutes before pressures up to 160 psi or 6 hours for 160–370 psi, at 60% relative humidity or less.^[7] The same chart adds 50% more time in damp or humid weather, and both set and cure lengthen sharply in cold weather and on larger pipe.^[7] Makers state that joints must not be tested with compressed air or gas.^[1]

3 Joining ABS to PVC

ABS and PVC are not solvent-welded together with ordinary cement. ASTM D3138 covers a separate transition cement for ABS-to-PVC joints, limited to non-pressure use at 25 psi or less, such as an ABS building drain meeting a PVC sewer.^[8] Whether that cement is accepted varies by code and jurisdiction; many installers use a mechanical transition fitting instead.

Supply houses stock cements and primers by material and pipe size; PlumbingSupplyAndMore's cements category (PlumbingSupplyAndMore has the same owners as this reference) is one example of how they are grouped. The PVC DWV and foam core entry covers drain pipe that is joined the same way.