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.
Residual Solvent Quantitation
Chemical Analysis
Measurement of chemical substances remaining in a textile after the finishing or printing stage ensures compliance with international safety standards. The process of residual solvent quantitation identifies the concentration of volatile organic compounds or restricted processing aids left on the fibres. It protects the health of the end user and the environment.
Laboratory Procedure
Gas chromatography or mass spectrometry provides the necessary precision to detect these trace amounts. A small sample of the fabric is placed in a sealed vial and heated to release the trapped gases. The equipment then counts the individual molecules.
Regulatory Threshold
Brands maintain restricted substance lists that define the maximum allowable parts per million for every chemical. Residual solvent quantitation is a mandatory step for any product intended for infants or sensitive skin applications. If the levels exceed the limit, the batch must undergo additional washing or be destroyed.
Many solvents used in the coating of technical fabrics are known irritants. Factories must optimize their drying ovens to evaporate these chemicals completely before the fabric is rolled. Third party labs provide the certification required for retail distribution.
Safety Limit
Detection limits for modern equipment are often as low as one part per billion. This high level of sensitivity allows for the identification of cross-contamination in the factory. Proper ventilation in the production area reduces the risk of solvent re-absorption.