What is meant by “sum of the concentration levels” for single-component vs. multi-component packages?
Single-component Package — The concentration level, expressed in parts per million (ppm), should be determined for each of the four metals and these numbers added together (summed). This summation must be within the limit of 100 ppm. Multi-component Package — The four regulated metals are not summed or averaged across all packaging components that together comprise a package. Rather, the concentration level, expressed in ppm, should be individually determined for each metal and summed for each packaging component within the package. Each packaging component must comply individually with the legal limit of 100 ppm.
