How does the jointing process work?
The cold solvent cement welding process used for CPVC pipes and fittings is foolproof, provided that a few simple steps are followed:
1. Cut the pipe square, preferable with a wheel-type plastic tubing cutter or a fine toothed saw with a mitre box. A square cut provides the surface of the pipe with the maximum bonding area.
2. Remove all swarf and chamfer the pipe with one of the specially designed chamfering tools. The slight bevel it cuts will ease the pipe into the fitting.
3. Using a clean, dry rag, wipe any loose dirt and moisture from the fitting socket and pipe end. Check the dry fit of the pipe and fitting - the pipe should comfortably entre the fitting between 1/4 and 3/4 of the socket.
4. Using the correct size applicator, apply FS-5 one step cement with a heavy, even coat to the pipe end. Immediately apply a medium coat to the fitting socket, then, for sizes 2" and above, apply a further coat to the pipe. Work quickly and push the pipe into the fitting, rotating the pipe 1/4 turn. It is important to align the fitting correctly, and to push the pipe to the bottom stop. Hold the assembly for 15 seconds to ensure initial bonding. Wipe off any excess cement with a rag.
The two key elements of the process are cleanliness and correct application of the cecment. Over application can result in excessive softening of the material. Under application (often shown by a lack of a continuous bead of cement around the socket shoulder) results in a week joint, and the item must be cut out, discarded and replaced.