HTS Code 3920.63 - Plates, sheets, film, foil and strip, of non-cellular unsaturated polyesters, not reinforced, laminated, supported or similarly combined with other materials, without backing, unworked or merely surface-worked or merely cut into squares or rectangles (excluding those of poly"methyl methacrylate", self-adhesive products, and floor, wall and ceiling coverings of heading 3918)