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#12 (permalink) | |
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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
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Eric Rasmussen http://www.erasmuspens.com Rifle cartridges (bullet pen kits) for penturning available at: http://www.bulletpenkits.com |
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#13 (permalink) |
Join Date: Mar 2015
Location: Pgh, PA
Posts: 1,008
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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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Cliff ![]() |
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