DURASTEEL

Insulation materials, products and systems, namely, composite sheets and panels comprising a reinforced cement core mechanically bonded to steel sheets on both outer surfaces for use in barriers, doors, ducts and ceilings; fire and/or blast-resistant doors, fire and/or blast-resistant barriers, ducts and panels comprised of reinforced cement and steel

Building and construction materials, namely, composite sheets and panels comprising primarily of a reinforced cement core mechanically bonded to steel sheets on both outer surfaces for use in barriers, doors, ducts and ceilings; fire and/or blast-resistant doors, barriers, fire and/or blast-resistant barriers, ducts and panels comprised primarily of reinforced cement and steel