How much Navac should i add to modify AlSi alloys 1

[boggyB]

I am having trouble finding the amount of Navac (sodium) to add to a bath for modification can anyone help me...!

 

[TVP]

Sodium has a strong effect at a concentration of 0.01% The concentration should not exceed 0.02%, as this leads to overmodification due to the formation of the AlSiNa compound. However, sodium modification fades quickly (within 20 minutes) due oxidation and reaction with the melt. Degassing or melt agitation can impair the modification as well. A typical range is 0.007 to 0.012%.

 

[boggyB]

Thanks TVP your the greatest