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Solvent Welding Butyrate Tubing

1. Solvent-welding butyrate tubing requires, well, a solvent (acetone will do it), some butyrate resin, a jar, and a brush.

2. We can provide you with some "fines," or you could cut some of the tubing scraps and generate some clean butyrate sawdust.

3. Mix 75% acetone with 25% MEK (not essential but it gives you more working time) and some butyrate dust to create a thin syrup. Make sure that all of the butyrate dust is dissolved. Do this in metal, glass or otherwise inert container.

Do this procedure in a vented hood.

It is best to let the mixture sit overnight to keep out bubbles. You can always add more butyrate the thicken the soup, or add more acetone to thin it. Also, do the bonding in a dry environment, as very humid conditions can cause a "milky" drying effect. You can avoid the MEK completely, however, this would give you less "working time."

For added strength, you may elect to make 1 or two axial cuts 1.5” into the sleeve. This will allow you to clamp hard with a pipe clamp during the solvent welding process. You can remove the pipe clamp after the weld has fully cured.

 Butyrate tubing welding

4. You may fully dip your sleeve and tube into the mix, or use a solder brush to apply the mixture to one side of the tube and one side of the sleeve. Quickly push tube halfway through the sleeve. Repeat on the other side.

Note: It is very important that you move quickly. Remember, this is not a "glue" but a "solvent weld." You will weld the sleeve to the tube, so once it sets, it is permanent.

Note: Do not overuse the solvent as you could produce a bead as the tubing joins. This is a very strong weld so you do not have to overdo the solvent.

 Butyrate tubing welding

However, for most systems, a simple axial slit into the sleeve with one or two hose clamps will do the job, and come apart easily for cleaning.

Butyrate Pipe

Charles Busada - 08-Apr-2016


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