On occasion, I have seen plastics pieces which I would like to
cast and later mold.
For example, recently, I have obtained a small birthday cake
ornament which I would like to cast, mold, etc.
How do you identify the correct plastics which can be used???
Will they preform as 'lost wax' does...
MORE IMPORTANT, WHICH SHOULD YOU STAY AWAY FROM??? Thanks, Jim R.
Most plastics will burn out successfully. If transparent they
will do so well. Other plastics may contain inorgainic filler and
thus need to be sprued so that any ash or incombustible residue
can drain (or be blown out with a judicsious air blast thorugh
your sprue system).
Take a small piece of the plastic, place on a clean brick and
put a flame on it from a torch. When you are done if there is any
residue you need to provide good ash drainage in your spruing. If
there is no residue the plastic has a 'flash point' and may in
fact burn out almost instantaneously without residue. Some
plastics do well with extra long burnout cycles.
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