addition to the fluorocarbon polymers applicant 39 s process may be used to treat other hydrophobic polymeric or copolymeric surfaces to make them wettable or hydrophilic typical polymers to which the process of this invention are applicable include phenolic resins urea formaldehyde polyester and alkyd polymers such as unsaturated polyesters of disbasic acids and dihydroxy compounds vinyl resins such as acryloids including methacrylate methyl methacrylate and ethyl methacrylate epoxy resins butadiene copolymers including styrene and acrylonitrile ethylenically unsaturated aliphatic alicyclic and aromatic hydrocarbon polymers such as polyethylene and polypropylene polystyrenes and polycarbonates applicant 39 s process is directed to the treatment of the hydrophobic surface of a polymeric material to make it hydrophilic to electroless copper plating baths such as macdermid corporation 39 s 9030 the preferred polymeric surface treating material is applicant 39 s mpa concentrate having a p 2 o 5 concentration of 70 82 the formula for the class of phosphoric acids or compounds utilized by applicant is r 4 p 2 o 7 the following is an example of the procedure to be followed in treating and then plating a polymeric surface 1 contact the polymeric material with an alkaline cleaner solution for a period of 1 3 minutes at a temperature of about 60 u00b0 c 2 water rinse the polymeric material for a period of 1 3 minutes with an overflow of spray at a temperature of 21 u00b0 49 u00b0 c 3 immerse the polymeric material in a mpa concentrate having a p 2 o 5 concentration of 70 82 at a temperature of 100 u00b0 140 u00b0 c for a period of ten minutes to.