Description:
15% Phosphor Copper Shot is use as a deoxidizing agent for copper, brass & bronze alloys. It will also increase fluidity and inhibit gas porosity. The shot we carry is approximately 1/8" x 1/32" in size.
Usuage:
Melting of brass, bronze and copper should be done quickly in a slightly oxidizing atmosphere. The crucible is removed and cooled to the proper pouring temperature. The surface is skimmed, phosphor copper shot is added by simply dropping it onto the surface. The reaction is very visible. The metal will become fluid and bright. Allow a minute or two for the reaction to complete, and pour.
The phosphorus is a reducing agent (deoxidizer). This product must be carefully measured so that enough oxygen is removed, yet a small amount remains to improve fluidity. This residual level of phosphorus must be closely controlled by chemical analysis to a range between 0.010 and 0.020% P. If more is present, internal porosity may occur and cause leakage if castings are machined and pressure tested. Also too much phosphor can cause the melt to be so fluid that it leaks from the mold and penetrates the sand. A little goes a very long way!
So the question is now "How is the phosphorus content determined with out expensive analysis equipement?" In the case of the average the user the answer is "By trial and error". The primary reason to use the shot is because the molds aren't filling well or have gas porosity problems. The literature suggests that 1 ounce of 15% copper phosphor shot be added to 100 lbs of metal. A teaspoon of shot weighs about 1 ounce. So for:
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(In the lower 48 states)
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Pint Can Shot, Approx. 4.5 Lbs | |
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Quart Can Shot, Approx 9 Lbs | |
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Revised: 1-15-10