Specifications iron oxide good quality yellow, blue, black, red, green Factory for Iron Oxide Black, , It is widely used for color in construction, coating, ... steel defect detection in battery and mechanical industry. Product nameIron Oxide BlackQuality StandardHC/T2250-91Mark Manufacture No. Package Specification25kg woven ... 352 mesh≤0.30.3Up to gradeFe3O4≥9494Up to gradeJBO Black Iron Oxide Powder