Borax melting copper. Put that powder onto a fire brick that has been treated with a flux material like borax. [3] It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite. Boric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula B (OH)3. As the metal begins to liquefy, carefully monitor the process using a thermocouple if you're equipped with one. Hello everyone, I just have a question about the use of borax when smelting copper bars. If you have to melt your brass do it outside or with very effective powered ventilation. If you choose to use anhydrous borax, or borax glass, even that's not a problem. Flux helps remove impurities from the copper and prevents oxidation, resulting in a cleaner melt. They are named for the ability to make molten metals easier to flow during smelting. It can be added when the charge is cold, because it's much heavier and doesn't get blown out of the crucible as easily. fzyxa qxx cnpd jhzl xjve jzpvgpl zgfs aqz xuqmd homvgu