Quantitative Analysis
Mass reduction occurs when a textile sample is treated with organic liquids to dissolve soluble non-cellulosic or non-protein components. Researchers measure the solvent extraction loss to quantify the amount of grease and oil present in raw wool or synthetic yarn. This value indicates the cleanliness of the material before further processing.
It is expressed as a percentage of the original bone-dry weight.
Chemical Procedure
The specimen is placed in a Soxhlet apparatus and washed repeatedly with petroleum ether or ethanol. During solvent extraction loss, the liquid carries away the fats and spinning oils into a flask. Once the solvent evaporates, the residue is weighed to find the total extractable matter.
The remaining fibre is then dried to confirm the solvent extraction loss percentage.
Industrial Significance
High levels of residual oil interfere with the adhesion of dyes and coatings. If the solvent extraction loss is too high, the fabric will show uneven coloration or poor wash fastness. Finishing plants use this data to adjust their scouring cycles.
Environmental Note
Disposal of the used chemicals adds to the operational burden of the laboratory. Precise management of the solvent extraction loss data is required to meet local environmental safety standards.
