Quantitative Measurement
Laboratory procedures involving the precise weighing of solid residues determine the percentage of non-cellulosic components in a flax sample. The chemical gravimetric assay measures the mass of material remaining after successive extractions with solvents and acids. This technique defines the purity of the fiber by stripping away fats, waxes, minerals and lignins.
It provides a definitive count of the available spinning material within a raw bale.
Residue Isolation
Systematic dissolution of the organic matrix allows for the isolation of the alpha-cellulose fraction. During a chemical gravimetric assay, the technician dries the sample to a constant weight before and after each chemical bath. These measurements reveal the exact proportion of pectin that must be removed during the scouring phase.
Accuracy depends on the sensitivity of the scales and the complete evaporation of the cleaning agents. The final calculation subtracts the final mass from the initial dry weight to find the impurity level.
Lot Valuation
Commercial contracts often rely on these findings to set the purchase price for raw flax imports. Lower residue levels found in a chemical gravimetric assay suggest a higher quality of retting. This data determines the suitability of the lot for fine count yarns.
