Re: Prototype Casting
From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 09/14/04
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Date: Tue, 14 Sep 2004 11:29:04 -0700
lm wrote:
>
> Hi;
> I need to cast parts of a prototype in a plastic similar to that of
> Tupperware or something like that. Problem is that I know nothing about what
> this type of plastic is called or where to get it. The main properties that
> I'm looking for is the ability for the plastic to be bent and abused and
> still keep it's basic shape. Heat resistance and being able to microwave are
> irrelevant.
>
> Does anyone know where to get someting like this?
A two-part castable silicone (platinum, tin, or peroxide cure) should
to do it. Two-part (polyether) polyurethane rubber should also do
it. Hot injection-molded thermoplastic elastomer Kraton rubber should
do it - and you have a tremendous choice of durometer values; oil and
filler loadings, and general properties. Kratons don't like temps
above 100 C. Of course, you do need access to the injection molder
and survivable dies.
What's within budget, process time, and shrinkage? Shrinkage upon
cure is serious stuff. If you don't need transparency, load with
acceptible inert filler. Beware outgassing and bubbles during
processing of chemical cures.
-- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf
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