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WATER TO POWDER RATIO MACHINE VACUUM MIXING 36:100 HAND MIX THEN VACUUM 38:100 Do not cast with a flask temperature lower than 650¡ÆC
Slurry temperature 21¡ÆC
Leave for 90 min to stand before burnout -
MACHINE VACUUM MIXING min. Weigh out water & powder 0 Add powder to water Mix under vacuum 1 Stop mixer and scrape blades 0.5 Mix under vacuum 3.5 Pour flasks 2 Vacuum flasks 1 Total time taken 8 HAND MIX THEN VACUUM min. Weigh out water & powder 0 Add powder to water Mix by hand 1 Mix with machine 3 Vacuum mixer bowl 1 Pour flasks 1 Vacuum flasks 2 Total time taken 8 Do not remove flasks from furnace to cast until they have been held at casting temperature for a minimum of 1 hour. If held for less than 1 hour, the core of the flasks will be at a much higher temperature than the digital temperature display states, and may result in metal mould reaction.