Polyamide; Chemical preparations in the nature of filtering materials in Filter contaminated water sources; Chemicals for use in biotechnological manufacturing processes; Chemicals for use in biotechnological product development; Chemicals, namely, acetylene, calcium phosphate; Medical grade polyurethanes for use in the manufacture of medical tubing, films, sprays, and membranes; Polymeric membranes in chemical form for the separation of gas; Seawater for industrial purposes; Unexposed dry ...