Electroplated ABS and polypropylene are tested, comparatively and with identical plate composites, for metal to plastic adhesion, resistance to humidity, thermal cycle, outdoor exposure and CASS. Results are discussed in terms of functional behavior of plated plastics.Based on the tests run, appropriate grades of ABS can be plated satisfactorily when properly molded for plating. The results show that adhesion of plate to ABS is substantially reduced in areas of high stress due to improper molding. The adhesion of metal to polymer on polypropylene is greater than on ABS. Stress due to improper molding of polypropylene does not reduce the adhesion in stressed areas to as great a degree as ABS. Water absorption of polypropylene is substantially lower than ABS which together with the higher adhesion property may account for the apparent superior outdoor weatherability of plated polypropylene.