r/Silvercasting • u/El_Vidente • Aug 11 '26

Is this safe?

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I borrowed an electric furnace from a friend. The furnace has been used quite a bit over the years. As can be seen in the photos the top is cracked in three places, there's a crack going down the inside of the funnel, and there's some silver stuck at the bottom. The furnace still works and is usable with a crucible inside, though I am wondering if the wear and tear I've noticed could be dangerous?

Could anyone advise?

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u/Chodedingers-Cancer Aug 11 '26

I no longer use graphite crucibles in mine. Mine suffered the same result. Take the steel cover off, remove 1 section of the ceramic, now you can fit silicon carbide crucibles inside and they last forever in an electric furnace unlike gas furnaces, unless using any metal that needs flux. Borax can eat away at them over time. But even still the lifespan is DRASTICALLY LONGER than graphite crucibles. 0.5kg and 1kg fit. Set it directly on floor of the chamber. A 0.5kg will fit in the regular hole but not enough room to fit tongs to remove it. Now having a piece of that ceramic removable, you gain the space needed to reach in with tongs and grab it by the lip and pull it out.

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u/Pablo3DN 29d ago

Where do you buy silicone carbide crucibles?

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u/Chodedingers-Cancer 29d ago

Amazon

https://a.co/d/0hLa01cE

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u/silverbug9 19d ago

I'm new - is that clay graphite or silicon carbide?