Particle size (μm) 0 .010 1 6 10 20 32 40 50 71 90 100 125 160 200 315
% volume 0.21 1.38 1.03 1.43 5.41 6.62 10.12 21.67 15.95 6.64 12.1 9.36 4.87 3.18 0.02
Table 2: Particle size distribution of S.