HT 1769 ULTRA WHITE CASTING PURPOSE
United # HT-1769 White Alloy is formulated for 18 K white gold casting, giving a Ultra White color. The # HT-1769 White Alloys can also be used for continuous casting in 18 karat if desired.
You should obtain excellent results by following a few simple instructions.
MELTING We do recommend pre-alloying all alloy and fine gold with aggressive stirring & fluxing to assure a uniform mixture.
Step : 1 Pre- Alloying (Fine gold + alloy) Temperature 1030° – 1050° C
1886° – 1922° F
Step : 2 Casting Temperature for 18 K Alloyed Grain 990° – 1010° C
1814° – 1850° F
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 Fluxing white gold is extremely important to pick-up oxides. Boric Acid is the recommended flux. 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.
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