A high-grade ferric oxide pigment of a pure red hue. It is obtained either native as a variety of hematite red or more often artificially by calcining copperas (ferrous sulfate) in the presence of lime. The composition ranges from 15 to 40% ferric oxide and from 60 to 80% calcium sulfate. The 40% ferric oxide is the “pure” grade and has a d 3.45.
Hangzhou ZeErRui Chemical Co., Ltd. Hangzhou ZeErRui Chemical Co., Ltd. located in Lingang industrial areas, our plant covers an area of 6000 square me.. Tianjin YR ChemSpec Technology Co.,Ltd. YR Chemspec?is a qualified manufacturer and supplier which audited and approved by SGS and ISO,we are strictly foll.. Nanjing Freehoo Chemical Co., Ltd. Nanjing Freehoo Chemical Technology Co., Ltd. was founded in 2012. since then we have been committed to the resea..