Hansen Engineering Calcining, pigments, scrubber systems, acid regeneration, pickling lines, processing, fiberglass compounds, acid fume scrubber, acid scrubber, pigment Hansen Engineering imports high quality inorganic Pigments and polypropylene superbags from China. We are also a Processor of domestic red and black iron oxide for quality classification and screening into 1 ton superbags and 50 lb. bags.