Solvent Remainder
Volatile organic compounds left behind after fabric finishing indicate incomplete washing or curing of polymer layers. For polyurethane-coated apparel, monitoring dimethylformamide residues is a critical quality control step because the solvent is used to dissolve polyurethane during the coating process. This measurement focuses entirely on the concentration of the chemical trapped in the dry polymer film, not the air quality of the factory.
If the extraction test shows levels above the legal limit, the entire batch of synthetic leather must be rejected by the brand.
Process Control
Excessive solvent concentrations in synthetic leather or rainwear can cause skin irritation for the wearer and produce strong chemical odors. When a finishing mill fails to heat the coated fabric sufficiently, the solvent does not evaporate completely. Proper drying ovens with air recovery systems resolve this issue.
Quality Check
Laboratory technicians extract the solvent from fabric samples using methanol or tetrahydrofuran before running gas chromatography analysis. This method identifies even trace amounts of the chemical down to parts per million. Brands reject any finished fabric that exceeds the strict limit.
Worker Protection
Eliminating solvent remnants ensures that factory workers have not been exposed to unsafe levels of vapor during fabric winding. This care guarantees a safe and compliant product.
