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Re: Gluing polycarbonate?
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
At 08:46 PM 6/30/2006, you wrote:
Forget using the 2-part epoxy unless you plasma-etch or sandblast
the areas you want to bond. Very few epoxies will create a reliable
long-term bond to polycarbonate unless the surface is specially prepped.
Yes, I did not know if there was any "reasonable" way to glue it. It
turns out sort of like trying to glue Teflon I guess (am am sure DOW
has a number of highly toxic primers though...) I use G-11 for
robots and you can glue that like a rock... But I'll put Lexan in
the Teflon gluability category. But the Envirotex stuff sticks fine
for that low stress thing (cleaned with 91% iso) ;-))
Since polycarbonate (Lexan, etc) is so sensitive to solvent-induced
stress cracking, most adhesives designed specifically for bonding
polycarbonate are 2-part reactive systems based on acrylic or
urethane resins. Most of the plastics fabrication shops I am
familiar with here in So. California use adhesives from IPS Weld-On.
See their line of adhesives specifically designed for compatability
with polycarbonate at:
http://www.ipscorp.com/industrial/polycarb.html If you want to
try any of these, and you can't find them locally, let me know and I
can pick some up at the plastics shop I visit every week.
This being said, I'd recommend using mechanical fasteners (nylon
screws) for securing your end plate. No matter how you look at it,
multiple fasteners will never fail instantly & catastrophically like
an adhesive bond can,
The plates already have full alignment holes for the turntable on the
mill, so adding the holes, taping, drilling was like a 20 minute
job... I like being able to take it apart in case the connecter
comes loose or bugs make a nest inside.
Yes..., I am on of these naughty people that has never used internal
baffles too :o)))
and who wants to see their nice Freau toroid with a big ding in the side ....
:o)))) They look like this!!
The dent goes to the "back :-))) Hopefully the shinny coil will
distract ones view from it :o)))