Quantitation of Residual Solvents in Industrial Polyurethane Coated Fabrics
Gas chromatography mass spectrometry quantitation of residual solvents in polyurethane fabrics demands liquid extraction to prevent border detentions.
DIN EN ISO 16189
Chemical Assessment
Standardized testing protocols quantify the concentration of dimethylformamide in consumer footwear and related materials. The framework of din en iso 16189 establishes a unified analytical approach for laboratories to identify this restricted solvent in polyurethane coatings and synthetic leathers. Brands rely on this method to confirm compliance with international chemical safety standards and restricted substances lists.
Extraction Procedure
Laboratory technicians cut the footwear specimen into small pieces to ensure complete exposure to the extraction solvent. Methanol is typically added to the sample container before heating the mixture in a sealed vial at a specified temperature to extract the target compound. The resulting solution undergoes filtration to remove suspended particulates that could damage or interfere with downstream analytical instruments.
This preparation guarantees that only the dissolved analytes enter the testing system.
Analytical Phase
Gas chromatography coupled with mass spectrometry separates and identifies the extracted dimethylformamide. This system compares the peak area of the sample against a calibrated series of standard solutions. The limit of quantification must meet the low thresholds set by regulatory bodies.
Compliance Threshold
Footwear manufacturers use these test reports to secure access to global consumer markets. Failing to meet the limits requires reformulation of the polyurethane resins or a change in raw material suppliers.