Impurity Measure
Fractions of flax fibre that consist of waxes, pectins and proteins define the presence of components other than the essential cellulose strands. High levels of non cellulosic content can interfere with dyeing efficiency and fabric softness if not properly treated during the bleaching stage. These substances bind the fibre bundles together inside the living plant but become undesirable residues in high count yarn.
Reducing this percentage through controlled chemical scouring is a standard requirement for high quality export fabrics.
Analytical Method
Laboratory teams determine this value by weighing a sample before and after extraction using specific organic solvents. The remaining mass of pure cellulose provides the baseline for calculating the share of the non cellulosic content that was removed. Knowing these figures allows the mill to calibrate the intensity of the scouring bath to avoid over processing.
Excessive residue can cause uneven yarn textures and block the absorption of high performance coatings.
Technical Limit
Quality certificates often list a maximum allowance for these secondary elements to guarantee consistency across different production lots. While some oils are necessary to keep the linen from becoming brittle, the non cellulosic content must be kept below a specific limit for yarn destined for industrial use. Consistent values help maintain stable spinning tensions across thousands of spindles.
Monitoring these variations ensures that the finished product remains compliant with international trade standards.
