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 Casting Temperatures and Flask Temperatures

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CASTING ALLOYS PRICE SHEETS

The casting temperatures given in the table are suggested starting temperatures. This results in good casting for most people. You may have to increase or decrease these slightly (not more than 50°F)

Flask temperatures vary, depending on the size of the pieces being cast and how much fine detail they contain. Large plain pieces require a lower flask temperature, 800°-950°F, while pieces with fine detail or filigree require higher flask temperatures, 900°-1150°F. Another rule of thumb is flasks used in vacuum/vacuum assist casting should be 75°-100°F hotter than when casting the same pieces in a centrifugal machine.

 

CASTING ALLOYS
Alloy	Color	Karat	°F Solidus Liquidus 10K	°F Solidus Liquidus 14K	°F Solidus Liquidus 18K
ALLY	Yellow	10/14	1635 / 1760	1605 / 1735
ALLGY	Green Yellow	10/14	1620 / 1730	1610 / 1720
ALLY18	Yellow	18			1650 / 1800
ALLW18	White	18			1700 / 1830
ALLW	White	10/14	1785 / 1900	1865 / 1965
ALLG	Green	10/14/18	1550 / 1670	1760 / 1880	1830 / 1950
ALLR	Red	10/14/18	1775 / 1880	1707 / 1820	1655 / 1760
Alloys are sold by Troy Ounce.

Porosity - Prevention The single biggest problem confronting the caster is porosity. By observing a few simple guidelines, porosity can be kept to a minimum

Vertical section of a cast ring showing a bad case of microporosity due to poor feeding of the molten metal. Severe shrinkage porosity at the sprue junction is due to a "hot spot"

Casting Temperatures: Add 100°-150°F to the liquidus temperature
Flask Temperature: Large casting require a lower flask temperature of 800°-950°F. Small detailed pieces require a higher flask temperature of about 900°-1150°F.
Porosity: Most porosity is caused by overheating the metal or by poorly designed or insufficient spruing.
Melting and Casting Problems: G&S Metals is always available to assist you in resolving your casting problems. gs@gsgold.co

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