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Oxygen and Sterling Casting Grain


#1

The first time I posted this question, I did not have my head
screwed on right, so here goes.

We just had our sterling casting grain tested for impurities. How
many parts per million would be an acceptable level of oxygen in
sterling casting grain? One source told us no more than 50ppm.
Someone else said 500ppm. Very confusing.

Troy Hines