Re: Prototype Casting

From: lm (no_spam_at_mail.no.thx)
Date: 09/14/04 

Date: Tue, 14 Sep 2004 18:41:54 GMT

"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:41473870.A13BAD75@hate.spam.net...
> 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

Castable silicone or polyurethane rubber sounds like it would work since I
dont have access to an injection molder. Where can I get it? I'm on a low
budget.

Thanks