Superstructure & exterior frame consists of heavy and sturdy basic structure of crca angle of 14 gauge body steel high quality, Cold, Rolled mild steel, Meeting requirements of astm a1008, 18 gauge 1. 2 mm thick optionally stainless steel type 304, 18 gauge 1. 2 mm thick working surface z, Black granite most commonly used, Suitable for general chemistry applications epoxy synthetic high grade solid epoxy 20 mm thick surface for greater chemical resistance ss 304 for general medical applications ss, 316l for food grade applications airfoil a radiused stainless steel preferably ss 316 airfoil is offered teflon coated ss, 304 can be offered as an option