iron oxide brown 686

fe2o3 or fe3o4 (%) ≥88
oil absorption (ml/100g) 20-30
res.on325 mesh (%) ≤0.4
water sol.salts (%) ≤0.5
moisture ≤1.0
ph value 4-7
tamped apparent density (g/cm3)
0.8-1.2
particle shape irregular
compared with std. ≤1
tinting strength 95-105