SVHC Notification Duties Triggered by a Component Nobody Specified
Component level SVHC breaches above 0.1 percent trigger immediate REACH Article 33 and SCIP notification duties regardless of total assembly weight.
Sub-Tier Supplier Audit
Meaning
A procedural mechanism for verifying compound formulations and compounding histories at raw material compounders before resin enters the injection moulding facility, a sub-tier supplier audit prevents unauthorized filler substitutions in polypropylene and engineering thermoplastics. This formal evaluation targets melt flow index stability, moisture absorption limits, and filler content percentages set during the initial resin formulation phase. Operating upstream of the primary tier processor, the assessment boundary terminates at the receiving dock of the compounder, excluding internal shop floor mixing operations.
Such evaluations check whether the delivered pellet matches the exact datasheet value or merely reflects the wider tolerance a moulder can hold across a challenging production run.
Traceability Protocol
Verification mechanisms depend on raw resin lot numbers tracked back to the original polymerization plant. Compounders mix virgin base polymers with mineral fillers and additives, creating distinct property profiles that differ sharply from unblended regrind economics. Auditors inspect batch mixing logs to confirm that regrind percentages never exceed agreed limits, because excessive scrap incorporation degrades tensile strength and alters shrinkage rates during the injection phase.
Laboratory tests run during the review measure ash content and density to expose unauthorized batch variations before the material reaches processing equipment.
Thermal Margin
Processing stability relies heavily on accurate melt flow rate testing conducted during the evaluation of compounder facilities. Injection moulders encounter severe warping and flash defects when barrel temperatures fail to match the actual thermal properties of the incoming batch. Granule samples undergo high temperature viscosity checks to determine if the lot stays within the narrow processing window required for high speed automotive tool geometries.
Small deviations in moisture content trigger severe hydrolytic degradation inside the injection barrel, resulting in brittle mouldings and structural failures under mechanical load.
Quality Agreement
Commercial liabilities shift between tiers when substandard polymer batches cause catastrophic part failures in end use applications. Material specifications define the precise mechanical properties required for structural components, whereas part specifications dictate final dimensional tolerances achieved by the tool. Supplier contracts establish financial penalties for out of specification resin deliveries, holding compounders accountable for lost production time and scrapped mouldings at the primary tier facility.
Independent verification procedures protect the downstream manufacturer from absorbing the cost of defective parts caused by upstream compositional drift.