For unknown homogeneous materials, how can the number of tests be reduced to lower the cost of material assays?
Often, for unknown homogenous materials, many tests have to be conducted to know the exact concentration of banned/restricted and reportable materials. The supplier should use engineering specifications to list controlled and reportable materials known to be intentionally added. Some chemical analysis of the controlled substances is advisable if there is reason to expect they could exceed reporting or allowed limits. For example, with materials such as Chromium (Cr) III conversion coatings, a lack of proper process control could produce excessive levels of Cr VI in the coating. In this instance, testing for the level of Cr VI is well advised. Suppliers are expected to exercise their best judgement.
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