Analytical Target
Chemical analytical procedures quantify restricted solvent residues remaining in polyurethane coatings, synthetic leather, and textile components. ISO 16189 solvent testing specifically measures extractable dimethylformamide content in footwear materials using gas chromatography with mass spectrometry detection. Global apparel brands require this test to confirm compliance with international restricted substance lists.
Extraction Process
Laboratory technicians cut sample materials into small pieces and extract residual solvents using methanol in an ultrasonic bath at elevated temperatures. Under ISO 16189 solvent testing, the filtered extract undergoes chromatographic separation to isolate target dimethylformamide peaks from background polymer matrix interference. Accurate calibration curves ensure precision down to fractional parts per million concentrations.
Limit Verification
Footwear brands enforce strict limits on residual coating solvents to protect consumer safety and factory worker health. Test reports from ISO 16189 solvent testing verify whether synthetic leather shoes meet regulatory thresholds, typically capped at five hundred milligrams per kilogram under European REACH annexes. Non-compliant lots trigger immediate batch rejection and mill re-audits.
Scope Boundary
This testing protocol evaluates extractable solvent residues rather than total volatile organic compounds released during drying ovens. Non-polyurethane fabrics like pure cotton or polyester without solvent coatings fall outside the scope of this testing method.
