HT-1478 STANDARD YELLOW ALL PURPOSE

UNITED’S # HT 1478 ALLOY is designed for 9K-14K & 19K – 23 K yellow gold casting & fabrication, which produces a Standard Yellow color. This alloy is not recommended for 18 karat usage.

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 1050° - 1100° C

1922° - 2012° F

Step : 2 Casting Temperature for 9K-14K Alloyed Grain 971° - 990° C

1780° - 1815° F

Casting Temperature for 19K-23K Alloyed Grain 1040° - 1060° C

1904° - 1908° F

FLASK TEMPERATURE For Vacuum casting 676° - 730° C

Use higher range for 19K-23K 1250° - 1350° F

For Centrifugal casting 565° - 730° C

Use higher range for 19K-23K 1050° - 1350° F

United # HT 1478 standard yellow alloy is formulated for 9K – 14K & 19K to 23 K Standard Yellow Gold Casting and sheet, plate & wire fabrication giving a Standard Yellow color. Alloy # HT 1478 can be used for casting also.

This Alloy is not recommended for 18 Karat.

MELTING The # HT 1478 Standard Yellow Alloy and fine gold should be melted together in a clean crucible. Put alloy in the bottom of the crucible and fine gold on top. Initial melting temperature should be 950ºC - 980º C for 9K – 14K, and 1100ºC - 1120º C C for 19K – 23K. Drop temperature somewhat before pouring as listed below. Boric acid flux may be used 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 9K – 14K - 950ºC - 980º C 1742º F - 1796º F)

FOR INGOTS 19K – 23K - 1100º - 1110º C (2012º F - 2030º F)