UN332 Dark Red Brass Casting Grain


Dark Red Brass Casting Grain. 1 Oz (28g).


UN332 is a 98.50 % Copper – 1.50% Zinc based Brass is formulated for fabrication of plate and wire fabrication giving a Reddish color. The UN332 Brass Alloy can also be used for Investment-Casting if desired. (See below)

MELTING The UN332 Cartridge Brass Alloy should be melted “as is “ in a clean crucible. Initial melting temperature should be 1050º C/ 1922º F. Drop temperature by about 5ºC before pouring. Boric acid flux should be used to skim out the dross and slag to keep the metal clean during the melting process. The metal should be mixed well with a stirring rod before pouring to assure a good mix.

POURING TEMP FOR INGOTS 1050° C - 1060° C (1922º F - 1940º F)

POURING Metal should be poured into a preheated, vertical graphite or lightly lubricated iron mold. A steady even pouring motion should be used slowing down at the end of the pour to prevent shrinkage in the top of the ingot. Use a round rod mold for wire and a 2 piece L shaped mold (preferably of a width of 3.0 inches and thickness 0.080” inches) for plate and sheet.

QUENCHING The metal ingot should be removed from the mold and quenched immediately in pickle solution or water. For heavy ingots a one-minute cool down before quenching prevents quench cracking.

FABRICATION The metal ingot should be cleaned of all adhering oxide or fluxes before rolling. The ingot should be rolled or drawn to a 50% reduction in size before annealing. After annealing continue the reduction at 50% before annealing again. Clean the ingot after each anneal. Keep rolls, dies and metal clean to prevent defects in the finished stock.

ANNEALING Annealing temperature 485º C / 900º F for 20 minutes. Quench immediately in water or pickle solution. A boric acid fire coat should be applied before annealing in open atmosphere ovens to protect the metal from heavy oxidation. Avoid over-annealing wire or plate stock as this can cause excessive grain growth creating orange peel effect on the surface of finished goods.

REMELTING Use 50% scrap to fresh mix when re-melting to prevent oxide build up in the metal.


UN332 Casting Brass is a Dark Red brass designed to cast jewelry samples, models, belt buckles, art objects, etc. It finishes to a bright pink color and easily solders with silver or low gold formulas. You should obtain excellent results by following a few simple instructions.

MELTING Melt Temperature for casting 1050° C - 1922° F

NOTES: Melt temperature may vary with type of unit. This alloy is designed for casting only. UN332 Brass should not be used for gold casting! UN332 Brass should not be cyanide gold plated, use acid gold plating unless nickel subplate is used.

FLASK TEMPERATURE Normal recommended temperature in the range of 580° C to 700° C / 1076° F – 1292° F depending on size of flask, karat & type of jewelry.

FLUXING Boric Acid is the recommended flux. Use as little flux as possible. Do not use carbon fluxes or any fluxes designed for refining; i.e., soda ash, saltpeter, etc. Avoid flux in bottom pour automatic casting units.

QUENCH TIME 20 – 25 minutes. INVESTMENT Most standard investment removers will successfully remove the REMOVAL investment powder. Fluoric-based investment removers are the best for removing the silicon oxide invisible coating. Use of aggressive acids causes stress corrosion and surface damage and is therefore not recommended.

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  • Model: UN332