Heritage Plastics, Inc. develops and manufactures a unique class of calcium carbonate concentrates for a wide variety of plas ... tic resins and applications. Our concentrates are designed to improve the performance and productivity, and more importantly, to help offset any rising resin costs. Our calcium carbonate concentrates offer proven advantages for minimizing the overall carbon footprint of the finished product versus a “resin only” system. Our expertise is focused on highly filled mineral based concentrates using our unique Minapol™ Additive Technology. Heritage Plastics calcium carbonate concentrates (masterbatch) are globally known for boosting the performance of blown film, blow molding, blow molded pipe, thermoforming polypropylene and polystyrene, extrusion coating, and injection molding. read more