Extraction Procedure
Analytical procedures used to strip a fabric sample of all additives and contaminants reveal the true weight of the base fiber. During a non fibrous extraction, technicians use solvents like petroleum ether or water to wash away spins oils and waxes. This step is a prerequisite for accurate fiber blend analysis in a laboratory setting where precision is required to meet trade descriptions.
Solvent Selection
Choosing the correct chemical depends on what the laboratory expects to find in the fabric. A non fibrous extraction targeting oils might use an organic solvent, while one targeting water-soluble sizes uses a hot water wash. The process must not damage the underlying textile polymers or alter their chemical properties.
Quantitative Result
After the extraction is complete, the sample is dried and weighed again. The difference in weight represents the percentage of non fibrous extraction material present in the original sample. This figure tells the buyer if the mill has added too much finish to increase the fabric weight artificially.
Quality Control
Excessive residues can interfere with dyeing or finishing in later stages of production. Conducting a non fibrous extraction ensures that the raw material is clean enough for high-quality processing. Most international standards specify the exact procedure for this test.
