MRC:
The values/s/ of the element,compound,or mixture of which the composition is fabricated,excluding impurities.BBRC
Composition And Percentage:
90.30 by volume aluminum and 4.50 by volume silicon and 5.50 by volume silicon and 1.00 by volume copper and 1.50 by volume copper and 0.45 by volume magnesium and 0.60 by volume magnesium
MRC:
Limitations placed on specific impurities to make the item suitable for particular uses,expressed in percent.BBRF
Impurities Limitation In Percent:
Chromium, 0.25; iron, 0.60; manganese, 0.50; titanium, 0.25; zinc, 0.35; total other elements, 0.15; manganese should equal 1/2 the iron when iron exceeds 0.45
