Determining Chemical Dissolution Tolerances in Standard Multi Fibre Analyses
Chemical dissolution tolerances require applying fibre-specific correction factors d to dry residue masses while holding temperature and exposure limits precise.
Ternary Fibre Separation
Quantitative Analysis
Analytical procedures for multi-component textile blends involve the sequential removal of individual fibre types using different selective solvents. A lab performing ternary fibre separation can isolate the proportions of a complex mixture, such as a fabric containing wool, polyester, nylon and cotton. This method is more demanding than two-part tests because the sequence of dissolution must not degrade the remaining components.
Mass Balance
Mass balance checks in ternary fibre separation ensure that the sum of the components equals the starting weight.
Extraction Cycle
Extraction cycles in ternary fibre separation begin with the removal of the most soluble fibre, followed by a thorough rinse and dry cycle for the remaining two. Subsequent solvents dissolve the next component, leaving only the final insoluble residue in the crucible. Every stage requires a specific correction factor to account for the unavoidable loss of mass from the fibres that are supposed to remain intact.
Calculation of the final percentages must be performed on a dry-mass basis to ensure the results are defensible for regulatory labeling.
Accuracy Guard
Accuracy is compromised in ternary fibre separation if the fibres are so physically entangled that the solvents cannot reach the inner surfaces of the yarn.