On Nov 22, 3:31 pm, "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

Dugie, I sell various forms of plastic on ebay including delrin and
nylon ( under the name surplusdealdude, if anybody's looking for small
plastic offcuts btw).

It's very unlikely that this piece is delrin - it would more likely be
a polyproplylene or polyethylene, since those are the standard types
of plastic they use for this type of item. These plastics are
impossible to glue, even with epoxy, largely because their surfaces
are "oily" - that's what gives them their smooth finish.

If the fob was delrin, it would feel like a piece of rock to the
touch. It would also be impossible to glue if it were delrin.

If it is Delrin, do not try to heat the edge with a soldering iron.
Delrin emits very noxious fumes when it is heated (it's a formaldehyde
derivative) and I know of 2 cases where it made people quite sick even
with a short exposure.

Most likely this is impossible to glue back together. Welding it with
a soldering gun will also likely not work - you need precise
temperature control to weld plastics together and all you'll do is
ignite the surfaces and make a mess.

Building up the back with epoxy would be a great solution, but you'll
have to make sure that the epoxy has something to bond to , because it
won't bond to the plastic. Maybe you can bond it to the inner
workings and build it up, layer by layer.

Overall, the best idea is to buy a cheap replacement, either on ebay
or at an auto wrecking yard and get it reprogrammed.