Description of grades

CR-40 Technical sheet

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Physical Properties
Target Min. Max.
Specific Surface Area (m2 /g) 4.5 4.0 5.0
Mean Particle Size (um) 0.51 0.46 0.58
Bulk Density (lb./ft3) 40 35 45
Specific Gravity 5.6 --- ---
Through 325 Mesh (%) --- 99.98 100
Chemical Properties
Target Min. Max.
ZnO Assay (%) --- 99.8 100
Cadmium Content (ppm) --- 0 10
Copper Content (ppm) --- 0 10
Iron Content (ppm) --- 0 10
Lead Content (ppm) --- 0 30
Heat Loss @ 110°C (%) --- 0 0.07
Ignition Loss @ 825°C (%) --- 0 0.2
Propionic Acid (%) 0.15 0.1 0.2