1 CHEMICAL PRODUCTS USED IN INDUSTRY, CHEMICAL PRODUCTS USED FOR SCOURING AND PASSIVATING AND GENERALLY ALL CHEMICAL PRODUCTS USED FOR THE SURFACE TREATMENT, SUCH AS PRESERVATIVES AGAINST RUSTS, PRIMING PREPARATIONS FOR PAINTS, VARNISHES AND ENAMELS
2 PASSIVATING PRODUCTS FOR IMPROVING THE RESISTANCE TO ZINC OR COMBINE ZINC ELECTROLYTIC DEPOSITIONS