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July 15, 2004
The correct adhesive to glue perspex is Tensol 70, manufactured by ICI. It
has a hardener which has to be added in the correct proportions. (easily
done by weight, with accurate scales) After gluing, and allowing to set for
24 hours, it should be heated to 80 degrees C for about four hours, to
harden the glue and normalise the acrylic, and prevent crazeing. Other 'one
part' glues that you can buy as liquids are based on dichloromethane,
probably with acryic chips disolved in it. The trouble with this type of
adhesive is that it is very agressive and will almost certainly cause
crazeing in a relatively short period of time if not normalised by heat.
The easy way is to find an acrylic specialist who can do the heating for
you, as it needs to be very accurate. Incidentally, it is far better to use
cellcast acrylic for this type of application than to use extruded.
Needless to say, cellcast is more expensive, and suppliers will often use
extruded. You should really know which you are using. (Extruded is much
more temperature sensative)
I hope all this helps. If you have any more questions, I will do my best to
answer them, but I can not help you with the specifics of size etc. as I do
not have the same sort of car. (Glass windups on mine)
R
"Roger Stinson" < rogerstinson@... > 33030
Posted on July 15, 2004 09:27 PM
Posted to category(s) Electrical System | Exterior | Gauges
