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>Solvent Welding Guide



Solvent Welding Guide

To make consistently good joints, the following points should be clearly understood.


1.The joining surfaces must be softened and made semifluid.

2.Sufficent cement must be applied to fill gap between pipe and fitting.

3. Assembly of pipe and fittings must be made while the surfaces are still wet and cement is still fluid.

4.Joint strength develops as the cement dries. In the tight part of the joint, the surfaces will tend to fuse together; in the loose part, the cement will bond to both surfaces.


Penetration and softening can be achieved by the cement itself, by using a suitable primer or by the use of both primer and cement. For certain materials and in certain situations, it is necessary to use a primer. A suitable primer will usually penetrate and soften the surfaces more quickly than cement alone. Additionally, the use of a primer can provide a safety factor for the installer, for he can know under various temperature conditions when sufficent softening has been achieved. For example, in cold weather more time and additional applications may be required.


Sufficent cement to fill the loose part of the joint must be applied. Besides filling the gap adequate cement layers will penetrate the surfaces and also remain wet until the joint is assebmbled. Prove this for yourself. Apply on the top surface of a piece of pipe two seperate layers of cement.

First apply  a heavy layer of cement; then alongside it, apply a thin brushed out layer. Test the layers every 15 seconds or so by a gentle tap with your finger. You will note that the thin layer becomes tacky

and then dries quickly (probably within 15 seconds); the heavy layer will remain wet much longer. A few minutes after applying  these layers check  for penetration. Scrape the surface of both with a knife. The thin layer will have achieved little or no penetration; the heavy one will have achieved much more penetrarion. If the cement coatings on the pipe and fittings are wet and fluid when assembly takes place, they will tend to flow together and become one cement layer.


Also, if the cement is wet, the surfaces beneath them will still be soft and these softened  surfaces in the tight  part of the joint will tend to fuse together. As  the solvent dissipates, the cement layer and the softened surfaces will harden with a corresponding increase in joint strength. A good joint will take the required working pressure long before the joint is fully dry and final joint strength is obtained. In the tight(fused) part of the joint, strength will develop more quickly than in the looser(bonded) part of the joint.


Solvent Weld jointing of large diameter pipes require special care and our Technical Service Department should be contacted in case of difficulty. Always replace the lid of the can after making a joint and follow the instructions on the can observing any warnings.


Joints should not be moved or disturbed for 10-15 minutes then the jointed pipe may be handled with care. Allow 4 hours if the jointed pipe lengths are to be laid in a trench.


Allow 8 hours to elapse before applying working pressures or 24 hours for test pressures. With pipe sizes up to 50mm, it is possible to reduce this time. Allow 1 hour for each 3.5 atmospheres of pressure. Brushes must be clean and dry before commencing solvent welding. Brushes must be thoroughly cleaned after use by washing in cleaning fluid. Do not dilute solvent adhesive with cleaning fluid. Use Solvent adhesive and cleaning fluid in a well-ventilated area. Keep away from naked flames and do not smoke. Always replace lids of containers. In any event, attention is drawn to the instructions printed on the containers.


When laying continuous runs of pipe, joints may be made quicker than the setting times advised above. The joint will not be disturbed with long lengths, providing that the pipe is not twisted or the previouslymade joint lifted out of place.

Our company has moved to plastic injection moulding industry in 2003.
In 2005, with a radical decision, with the support of our parent company
 GEMAŞ GENEL MÜHENDİSLİK AS, we started to produce UPVC Pipe Fittings and Valves.




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