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Old 11-19-2017, 08:04 AM   #11 (permalink)
Join Date: Apr 2017
Location: Zionsville, IN
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McMaster.... I love that place. i always have stuff in my cart. I looked through the plastics and there seems to be several options for you.
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Old 11-19-2017, 09:07 AM   #12 (permalink)
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Join Date: Jul 2006
Location: Hillsborough, North Carolina, USA.
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Originally Posted by bmachin View Post
Acetal (Delrin) maybe?
Delrin works quite well. I bought a box of Delrin pieces several years ago and have used it for molds (PR, Alumilite, and silicone), bushings, gluing jigs, and custom mandrels for CA build-ups. Nothing sticks to it.

That said, any mold (of any material) that gets scuffed over time will eventually become difficult to demold from. A good mold release agent will help tremendously. So well, in fact, that the actual mold material becomes less important. I use UMR mold release. With it, you can even cast silicone in a silicone mold (without it, the two will fuse permanently).

I hope that helps,
Eric Rasmussen
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Old 11-19-2017, 09:08 AM   #13 (permalink)
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Certain HDPE plastics can be melted into blocks. Its any thing made from HDPE thats been injection molded not blown like milk bottles. HDPE for bottles is just a slightly different mix and doesn't melt nicely. The injection molded stuff melts down like thick wax.

I've been making blocks upto breadpan loaf size. Luckily I have an endless source of HDPE from work.
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