EN 14236:2007(E) Specification of contamination dust Four separate batches of dust shall be used with 95 % of the particles in each batch in the appropriate size range given below: a)0 um to 100 um Average size (50士10) um; b) 100 um to 200 um Average size (150士10) um; c) 200 um to 300 um Average size (250 士10) um; d) 300 um to 400 um Average size (350士 10) um. Each of the above batches shall have a composition by mass of: Black iron oxide(Fe3O4) 79 % Red iron oxide (Fe2O3) 12 % Mineral silica flour (SiO) 8% Paint residual flake 1%