Belgium imports from Switzerland · Plates, sheets, film, foil and strip, of plastics, reinforced, laminated, supported or similarly combined with other materials, unworked or merely surface-worked or merely cut into squares or rectangles (excl. of cellular plastic, addition polymerization products, condensation polymerization products and rearrangement polymerization products; self-adhesive products and floor, wall and ceiling coverings of heading 3918)