3.3.5 Calculation of the percent content of substances in materials
Percent content should be determined from the ratio of the masses of an individual declarable
substance within a homogeneous material multiplied by 100, i.e.:
Mass of Substance
---------------------------------------------X 100 = Percent Weight
Mass of homogeneous Material
It is important that substance content is assessed at the material level, and not calculated as the
amount of substance in a part or assembly.