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Why use synthetic molds?
Why not use classic greensand or plaster
molds? It's something that highschool kids can
do.
Greg H.
----- Original Message -----
Sent: Friday, August 26, 2005 8:11
Subject: [Biofuel] Alternative to Toxic
Mold Compounds?
I know that this may fall outside the scope of our usual discussions but, I
thought there might be knowledge to gain here.
In the process of building a prototype solar tracker, I'm stuck with a
dilemma. Some of the parts I make need to be molded. So, I'm making silicone
based molds and casting the parts with two-part polyurethane.
According to the MSDS sheets, the catalyst for the silicone mold is a
tin-based compound and very toxic. The reason I started in this
direction is that it's readily available, widely used and proven to work.
When finished, I can cast parts in almost any material. I can even pour low
melt temperature metals.
I would like to make/use a casting material from something which is
safer to me and the environment and still be durable and weather-proof. I was
making pasta the other night and found (the next morning) a couple of pieces
of spaghetti, dried and conforming to the shape of the colander. It made me
wonder if there is a casting materiel made of carbohydrates and /or starch
that I can use with a latex rubber mold.
Any thoughts?
Mike
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