DS EN 15979:2011 Testing Of Ceramic Raw And Basic Materials - Direct Determination Of Mass Fractions Of Impurities In Powders And Granules Of Silicon Carbide By Oes By Dc Arc Excitation Defines the method for the analysis of mass fractions of the impurities Al, B, Ca, Cr, Cu, Fe, Mg, Ni, Ti, V and Zr in powder and grain-shaped silicon carbide of ceramic raw and basic materials.