TAEANTECH High Purity Graphite Crucible Silicon Carbide Crucible

For 3 kg of gold, take the 3KG model, TAKJ-GC3. Its height is 123 cm and its Φ1 measurement is 68 cm, so check both against your furnace chamber before you commit — a chamber that clears the diameter can still be too shallow. If your melts usually run under 3 kg, a smaller size heats faster and is easier to handle. Where none of the eight sizes fits, we build the size to suit.

Gold, silver, copper, aluminum, lead, zinc, brass and other non-ferrous metals are all within its range. It is built for non-ferrous work, so do not plan on steel or titanium in the same graphite crucible. Match the capacity to the metal you run most: copper and brass push the temperature range harder, aluminum sits far below it, and the glaze layer helps against corrosion from the more aggressive melts.

Let it cool in place, or move it onto a dry, heat-resistant surface — never straight onto a cold metal table. Rapid cooling is what cracks graphite, and a ruptured crucible during a pour is a safety issue, not just a replacement cost. Give it time after the pour before you touch it, and keep cold tools and cold metal off the hot body. Handled this way it lasts far longer.

No — carbon content runs up to 99.99%, so gold and silver keep their original quality through the melt. Contamination usually comes from what happens between melts rather than from the graphite: keep one crucible to one metal family where you can, and clean out flux and residue instead of letting it build up. Tell us the metals you run and we match the glaze layer to them.

Yes. Different sizes can be customized, so you are not limited to the 1 kg to 10 kg range. Send the usable diameter and depth of your chamber, the metal you run, and the capacity you need in kilograms, and the crucible is made to that. As a graphite crucible manufacturer we shape it to your furnace rather than asking you to work around ours. Mention anything odd about the chamber — a lip, a spout, an off-centre opening — at that stage.

It withstands temperatures up to 1800°C without shrinking or deforming, and the high-pressure forming holds that shape through repeated heating and cooling. Check your working temperature against that figure with headroom, because a crucible run near its ceiling ages faster than one run well under it. Tell us your furnace type when you specify the size — an induction furnace needs the fit confirmed against your coil and power setup before you buy.