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larry moe 'n curly

wrote:

Our daughter has this little doll wheel chair that the leg broke off
of. The leg has a wheel and it is a pretty big piece that broke off
but it fits very tightly when I put it together where it broke off and
there are actually 2 pieces that broke off and join together and I
think it would glue together nicely because the pieces are at right
angles and I would be gluing two pieces together, not one.

The best glue depends on what plastic you're gluing.

Plastics that are easy to glue are styrene (recycling triangle says
"PS"), ABS, and PVC, and CPVC, and they're best bonded with a solvent,
like lacquer thinner, brush-on liquid glue from a hobby shop,
carburetor/throttle body cleaning spray, or acetone. CPVC may need
CPVC plumbing pipe cement, and it will also work on PVC. Full
strength doesn't develop until about 48 hours, as I learned when I
tried to glue a truck tailgate handle 3 times. Polycarbonate can also
be glued with solvent, but if you get it wrong you have to remove the
affected surfaces and start all over. Don't use super glue on these
plastics because solvent gives a much better bond.

Hard polyester can be glued fairly well with epoxy (the slow-cure type
usually works better) and maybe super glue.

Plastics that can't be glued well at all include polypropylene (PP),
polyethylene (PE or HDPE), nylon, delrin, and acetal (lots of plumbing
parts), and even polycarbonate, but they can be melted back together
with a soldering iron or wood burning iron. The latter is better than
a soldering iron if it has a nonstick tip (Teflon coated). Cut a
scrap from the same plastic you're trying to fix so it will serve as
filler, like welding rod does.

For something structural like a leg attached to a wheel, maybe you
should insert a wooden dowel coated with epoxy (for a mechanical
repair, rather than a glue bond) before joining the broken plastic
pieces together.

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