Re: bronze and rubber molds


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Posted by Lyle Landstrom on August 14, 19100 at 16:01:42:

In Reply to: Re: bronze and rubber molds posted by harry on August 14, 19100 at 12:47:39:

I've tried making silicon bronze by adding beer bottles to molten copper and ended up ruining another crucible. I'd go by some real certified silicon bronze or scrap and use the Nitric Acid test to make sure I've got the right stuff.

Silicon bronze has more in it than just silicon and copper. Atlas Metals in Colorado will ship Silicon Bronze in small quantities as well as Pyramid Products in California and IASCO in Minnesota. Probably hundreds of other places as well.

I hope your not going to try to pour this into a rubber mold. It won't work. If you want some good rubber material for use in moldmaking go to they offer a good selection and make the stuff for most of the other guys. RTV rubber is used for pouring pewter (low temp) but there's no rubber around that will withstand 1850 - 2150 that you need for copper alloys.

Good Luck

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