HTM-360 STANDARD YELLOW ALL PURPOSE

UNITED Alloy HTM 360 is a Bright Yellow alloy that may be used for

9 K – 14 K casting. The alloy is developed to provide peak performance in automated or enclosed casting machines.

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 1010° - 1040° C

1850° - 1910° F

Step : 2 Casting Temperature for 9 K – 10 K Alloyed Grain 970° - 990° C

1780° - 1815° F

Casting Temperature for 14 K Alloyed Grain 950° - 970° C

1745° - 1780° F

COMPOSITON 15% ZINC, 11.25% SILVER, 73.75% OXYGEN FREE COPPER

HARDNESS 22K 90 – 95 Hv – As Cast.

UNITED’S # HTM 360 ALLOY is designed for 18K- 23 K yellow gold casting, which produces a Standard Yellow color.

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 18K-23K Alloyed Grain 1040° - 1060° C

1904° - 1908° F

FLASK TEMPERATURE For Vacuum casting 676° - 730° C

Use higher range for 18K-23K 1250° - 1350° F

For Centrifugal casting 565° - 730° C

Use higher range for 18K-23K 1050° - 1350° F

United # HTM 360 standard yellow alloy is formulated for 9K – 23 K Standard Yellow Gold Casting and sheet, plate & wire fabrication giving a Bright Yellow color. Alloy # HTM 360 can be used for casting also.

MELTING The # HTM 360 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 for 18K – 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 18K – 23K - 1100º - 1110º C (2012º F - 2030º F)