Ionexchange membranes of fluorinated noncellular plastic material, for use in chloralkali electrolytic cells
Plates, sheets, film, foil and strip, of noncellular addition polymerization products, n.e.s., not reinforced, laminated, supported or similarly combined with other materials, without backing, unworked or merely surfaceworked or merely cut into squares or rectangles (excl. selfadhesive products, floor, wall and ceiling coverings of heading 3918, poly"vinyl fluoride" sheet, ionexchange membranes of fluorinated plastic material for use in chloralkali electrolytic cells and biaxially oriented poly"vinyl alcohol" film containing by weight > 97% of poly"vinyl alcohol", uncoated, of a thickness of < 1 mm)
Poly(vinyl fluoride) sheet, and biaxially oriented noncellular poly"vinyl alcohol" film containing by weight > 97% of poly"vinyl alcohol", uncoated, of a thickness of < 1 mm, not reinforced, laminated, supported or similarly combined with other materials, without backing, unworked or merely surfaceworked or merely cut into squares or rectangles (excl. selfadhesive products, floor, wall and ceiling coverings of heading 3918)