Material Screening
Analytical screening processes determine the chemical composition of individual, mechanically inseparable sub-materials within an electronic assembly to verify compliance with restricted substance limits. Performing a homogeneous material assessment requires that the component or board is separated into its most basic material constituents. These constituents include plastics, metals, coatings, and solder alloys.
The assessment establishes that no single material contains restricted substances above the allowed threshold. For example, a single capacitor must be divided into its metal leads, ceramic dielectric, and surface plating to evaluate each part individually.
Testing Procedure
Destructive and non-destructive laboratory testing methods analyze the chemical makeup of each isolated substance to ensure accurate composition data. During a homogeneous material assessment, technicians use x-ray fluorescence spectroscopy for rapid screening of lead, mercury, or cadmium. When screening indicates potential hazards, wet chemical analysis provides definitive quantitation.
This two-stage approach optimizes testing resources by reserving high-cost chemical analysis for borderline cases.
Compliance Verification
Documentation reviews compile test reports and material declarations to construct a technical file for regulatory authorities. The output of a homogeneous material assessment provides the objective evidence needed to compile a certificate of conformity for environmental standards like restriction of hazardous substances. This documentation protects manufacturers from regulatory penalties and assembly recalls.
