ZINC In terms of mechanical properties, zinc possesses greater resistance and hardness than tin or lead, but considerably less than aluminium or copper. The pure metal cannot be used in applications where stress resistance properties are required. Only available from stock in sheet form. BRONZE This name indicates a family of metal alloys formed mainly from copper and tin, but that may also contain lead, zinc and silver in such proportions as to render the molten mixture suitable for various applications in various sectors. Available in plates, rods and sheets. TIN In brazing rods.