Re: CASTING Plaster Investments vs. Ceramic Shell?????


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Posted by John Stricklin on February 09, 1999 at 22:15:51:

In Reply to: CASTING Plaster Investments vs. Ceramic Shell????? posted by bruce paul fink on January 15, 1999 at 16:48:15:

I understand plaster is used for molds for non ferrous casting. This exposes the plaster for a very short time to actual casting temperatures below 1800F or so. I want to try a different approach which will involve mold exposure to 1400-1500F for several hours (very gradual heatup & similar slow cooldown). I like plaster for moldmaking and haven't tried investments as used for ferrous investment casting. USG tells me plaster will disassociate back to powder if exposed to greater than 400-600F for any length of time. From Bramlebush postings it sounds like R&R plaster-silica mix works for non ferrous castings. Can this type of mold material withstand the temperature cycle of 1400-1600F for several hours exposure?? Could straight plaster??

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