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What temperature should I have my flask at when casting?

Low flask temperatures during casting may lead to incomplete filling and porosity due to rapid solidification of the molten metal. High flask temperatures promote shrinkage porosity and gas porosity via investment breakdown, leading to rough castings. 
As an approximate guide, silver and carat gold alloys require flask temperatures of between 450°C and 700°C, again the higher temperatures being used for fine or filigree castings. 
Note these temperatures may vary depending on charge weight. For platinum casting, flask temperatures must be a minimum of 900°C using special investments capable of withstanding these temperatures.