Show NEW ROOFING MATERIAL IS MADE OF ASPHALT AND COPPER METAL commercial production of a copper covered non nonmetal metal lic substance long the adreani of electro metallurgists has been accomplished and put to a large industrial use according to an announcement made recently by the anaconda copper mining company the success of the new process unites the interests of two large industries copper and asphalt in the production of roofing materials the achievement gives the country a new product copper clad asphalt shingles the roofing is asphalt covered and nd impregnated with copper the process of manufacture is is termed many years ago it was discovered that copper could be deposited having fine texture and high tensile strength innumerable attempts have been made to transfer this discovery from laboratory to factory up to the present however they have been unsuccessful when applied on nonmetallic non metallic bases |