Huber Engineered Materials is your trusted source for Halogen-Free Fire Retardant Additives, Ground Calcium Carbonates and Cast Polymer Performance Materials. Our fire retardant additives include Alumina Trihydrate, Magnesium Hydroxide, Engineered Molybdates and Nitrogen-Phosphorus grades. Huber’s calcium carbonate products are recognized for their performance quality, high brightness and high purity standards.