Where:
Hc = Organic HAP content of the coating or printing material, kg organic HAP per kg solids in the coating or printing material.
Wc = Mass fraction of organic HAP in the coating or printing material, kg organic HAP per kg material, determined according to paragraph (e)(1) of this section.
Wf = Mass fraction of solids in coating or printing material, kg solids per kg of coating or printing material, determined according to paragraph (e)(2) of this section.
40 C.F.R. §63.4321