This standard specifies an atomic absorption spectrometric method for
the determination of the copper content of rubbers. The method is
applicable to raw rubber and rubber products having copper contents
above 1 ppm. Copper contents below this limit can be determined,
provided that suitable adjustments are made to the mass of the test
portion and/or to the concentrations of the solutions used. The use of the
standard additions method can lower the bottom limit of detection.