17 Semi-processed plastics; semi-processed synthetic materials, namely, semi-processed synthetic resins, semi-processed synthetic rubber; films, foils, sheets and ribbons of synthetic materials other than for wrapping or packaging, namely, semi-worked synthetic plastic as semi-finished products in the form of films, foils, sheets, and ribbons for industrial applications; films, foils, sheets and ribbons of electrostatic synthetic materials other than for wrapping or packaging, specially semi-worked electrostatic synthetic plastic as semi-finished products in the form of films, foils, sheets, and ribbons for use in various industrial applications; films, foils, sheets and ribbons of synthetic materials for protecting surfaces, particularly designed for industrial use; films, foils, sheets and ribbons of electrostatic synthetic materials for protecting surfaces