On Nov 22, 5:30 pm, Paul Franklin
wrote:
On Thu, 22 Nov 2007 16:31:31 -0400, "Dugie"





wrote:
Hi,

I have a remote car door control, and a piece of the plastic case has been
snapped off. The piece has one of the key-ring loops at the top. The other
loop is on the undamaged half of the case.

Can find no markings which seem to identify the plastic type. Inside the
case, maybe written by hand in white paint, is 2c, and below that, 23. Any
other markings are FCC and Canadian radio compliance codes, etc. The maker
is DENSO.

Markings as on exterior of cover: FCC ID:HYQ1512S, CANADA:1551 102 326,
RSS - 210, DENSO.

The broken piece is large enough to work with, about 1 1/8" long and 3/4"
wide. The break is roughly a straight line, the edges are ragged and don't
fit together tightly. Some unknown person has in the past tried to repair
with what looks like plastic model cement. It hasn't held, and I've peeled
the cement off.

After Googling a lot, I still don't know how to identify the type of
plastic, and how make a solid repair. Using "Ambroid ProWeld Professional
Plastic Welder, For styrene, Butyrate, ABS & Acrylic (Lucite or Plexiglas)"
the parts are together now, but not very securely.

Working from the inside so it looks ok, would hot glue gun material work?
Or use a soldering iron tip to smooth and seal the edges? (I've not had
good results with this in the past)

Help would be welcome.

Thank you!
Dugie

Stuff like that is usually injection molded, and often with a variety
of PVC, so you might try the solvent used for PVC plumbing.

I've had pretty good luck on things like this by first gluing it with
polyurethane glue (gorilla glue) and then taking a small piece of
aluminum window screen cut to bridge across the gap and then using a
soldering iron to heat the screening and press it into the melted
plastic. Done on the inside, you don't see it, but the screen
reinforces the break so it is very strong. I've even used a few short
pieces of small diameter bare wire instead of screen when there isn't
room to use the screen.

HTH,

Paul F.- Hide quoted text -

I would second this suggestion. Type of plastic is not as important
as reinforcing bond. You could identify plastic by solvent and
burning tests but this would consume some of it. I would probably
just use a two part epoxy recommended for plastic.

Frank