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Flask Temperature

Proper flask temperature is important to control porosity levels. When flask temperature is too high, porosity levels due to design/shrinkage problems are increased. When dealing with shrinkage porosity lower flask temperature in 50 degree F stages. Proper flask temperature should be the lowest possible, as long as complete solid filling of cast parts takes place. The lower the temperature the smoother the cast surface. The proper temperature will vary with flask size, weight of parts, type and karat of metal and type of casting machine (vacuum or centrifugal). When flasks are too hot, hot tearing may take place. Gases may also be released when flasks are too hot due to the calcium sulphate in the investment powder. When sulphate reactions occur, a yellow color is noticeable on the investment wall at the main tree feeder and (or) an odor of sulphur (rotten eggs) may occur. When this reaction takes place, gas porosity will take place. The metal quality and reusability of the remaining metal will be greatly reduced due to heavy oxide buildup, created by gas reaction.

NOTES: It is recommended to keep similar size and weight pieces on the same tree, thus avoiding different solidification rates. When different weight parts are on the same tree, place heaviest parts nearest parts nearest the base, which allows the heavier parts to fill last when metal is slightly cooler. It is very important to keep metal as clean and fresh as possible to avoid oxide buildup when using cooler flask temperatures. Heavily oxidized metal and cool flask temperatures add up to oxide inclusions in the cast parts.

Precious Metal Spot Prices

  Bid Change
Gold $1,245.18 +$0.62/+0.05%
Silver $16.57 +$0.27/+1.65%
Platinum $917.00 +$2.50/+0.27%
Palladium $864.00 +$1.50/+0.17%
Gold 2017-06-27 1:09 AM
Bid/Ask $1,245.18/$1,245.63
High/Low $1,245.90/$1,241.10
Change +$0.62/+0.05%
Silver 2017-06-27 1:09 AM
Bid/Ask $16.57/$16.61
High/Low $16.63/$16.51
Change +$0.27/+1.65%
Platinum 2017-06-27 1:09 AM
Bid/Ask $917.00/$923.00
High/Low $924.00/$914.00
Change +$2.50/+0.27%
Palladium 2017-06-27 1:09 AM
Bid/Ask $864.00/$875.00
High/Low $875.00/$862.00
Change +$1.50/+0.17%

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Prices shown are for reference only. Please contact our trading desk for accurate, up-to-the-minute pricing.