Switch Handle Pictures
Dwight K. Elvey
dwight.elvey at amd.com
Fri Apr 8 19:03:38 CDT 2005
>From: "vrs" <vrs at msn.com>
>From: "Dwight K. Elvey" <dwight.elvey at amd.com>
>> This is great. What are you using to make the molds?
>Well, I went into the local TAP Plastics, described what I wanted to do to
>the nice saleslady, and ended up with these products:
>TAP Silicone RTV System, Side A and Side B. Side B comes in a couple of
>color coded versions. I chose "TAP Silicone RTV Catalyst GREEN", which has
>a 1 hour working time, and a 24 hour cure. This stuff is easy to work with,
>and hardens to a rubbery consistency, very much what you want for
>mold-making. It is white until you mix in the catalyst, which dyes it
>Quick Cast TAP Casting Resin, Side A and Side B. This stuff hardens into a
>stiff plastic, perfect for switch handles :-). Side A and Side B are clear,
>but the result will be white after it cures. This color change makes it
>more difficult to predict the effect of the colorants. This stuff has a
>very short working time -- a few minutes. It is recommended to remove the
>parts from the mold in an hour (don't know why; some kind of chemical
>reaction with the mold is predicted, but I've never seen it).
>TAP Premium Pigment, in yellow, brown, red, and blue. These are added in
>small quantities to Side B of the resin, before side A is added. Only a
>very small amount of the pigment will actually stir into side B (most of the
>pigment just lays there, no matter how much you stir.)
>Hope that helps :-). More later...
Someone told me that it was a good idea to use
PAM ( cooking spray ) as a mold release. This may help
with issues of leaving it in the mold too long.
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