We are offering brown iron oxide. Technical specifications total iron (fe2o3) content % 88-91 ph value 5-8 oil absorption (g100g) 25-35 volatile matter (% by mass) 0.5 density (gcm3) 2.0-2.5 residue on 400 mesh sieve (% by mass) 0.4-0.5 water soluble (% by mass) 0.7-1.0 loss on igition (1000'c) 1.0-2.0 particle shape irregular tinting strength vs standard % 95-105.