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METAL MELTING IN FUSED SILICA CRUCIBLES - TIPS AND INSTRUCTIONS

Posted by JETS INC. on Sep 19th 2016

Melting dish crucibles can be used for Melting Gold, Silver, Brass, Copper and other metals.

It is highly recommended that fused-silica crucibles be treated prior to use by glazing them with Borax. The process of Glazing will protect the crucible and extend the life (the number of times of use). Glazing will also help to prevent any of the crucible material, small particles from getting into and mixing with the metal.

Crucibles are made of High Grade Clay Bonded Fused Silica and withstand temperatures up to 2500°F/1,371°C. The melting dish can be handled with a tong or "Whip Handle", dish type crucibles have a pouring spout for pouring the molten metal into Ingots or flasks.

Crucibles should be handled with appropriate holders: a tong a handle or the whip depending on the size and style. Make sure that the crucible is secured and or held and handled properly.

Borax should be used during the melting process, as metal is being melted, sprinkle some borax onto the surface of the metal.

It is better to melt small amounts, smaller solid pieces first and adding more material as the metal becomes molten.

Melting Dust form of Metal may be a problem. If you are melting fine dust, we recommend; first melt some solids and slowly add the finer particles to the molten metal, add small amounts at a time; the fine dust will be absorbed by the molten liquid in the crucible.

Melting small amount /smaller pieces first and adding metal to the crucible will prolong the life as well. Store Crucible in a dry place when not in use.

Use a Graphite/Carbon Rod to stir and mix the metal, during the melting process. Add Borax (a pinch or two) while melting and mix with carbon rod. This will help to gather any impurities that may be in the metal and lift them to the top and adhering to the graphite rod. Generally they will appear as dark spots on the surface of the molten metal. The mixing rod serves a dual purpose, first of all to mix your metal and second it will collect the impurities, adhering to carbon rod.

When pouring the hot molten metal, make sure bring the crucible close and above the ingot or flask to avoid any splatter.

Pouring should be with a steady stream of the liquid metal into the cavity of the ingot, make sure that the amounts of metal in the crucible does not exceed the capacity of your ingot. Excess amount of metal, overfill and having a run-off can create a mishap. It is better to keep the extra metal for a separate pour. Pouring less amount of metal than the capacity of the Ingot will not pose any problem.

Allow the molten metal to cool off and solidify. The cooling process is from a Red Hot Glow, dissipates heat and color will change and darken, cooling period. Allow the cooling process before handling the metal bar..

You can find all the necessary tools and supplies for melting in our shop , under "CASTING, MELTING SUPPLIES" category.


WORK SAFE

WORK AREA MUST BE FIREPROOF

MELTING METALS & WORKING WITH MOLTEN METALS IN EXTREME HIGH TEMPRATURES CAN BE VERY DANGEROUS!


SAFETY TIPS:

USE: Safety Heat Gloves, Protective Clothing, Protective Shielded Safety Glasses and Face Protection.

Work Area must be Fireproof, Heat Resistant with Non- Flammable materials.

Do not utilize your workbench, made of wood, laminate or counter top surfaces. The melting area and surfaces being used should be Metal, Ceramic, Sand or Transite, (NON COMBUSTIBLE).

If you have further questions please CONTACTJETS Inc.

JETS INC. (Jewelers Equipment Tools Supplies)