Determining Quantitative Fiber Ratios in Cotton Viscose Blends
Selective dissolution via seventy-five percent sulfuric acid or formic acid zincate separates cotton from viscose after solvent scouring and mass correction.
Commercial Mass Determination
Invoicing Standard
A standardized mass accounting method establishes invoice weight by combining oven-dry fiber mass with an official moisture regain allowance. Standard international trade contracts rely on commercial mass determination to resolve water weight fluctuations in raw fiber consignments. Wool and cotton shipments lose or gain moisture depending on ambient relative humidity during transport.
Buyer and seller agree to invoice based on dry weight plus a fixed percentage regain specified in ISO standards.
Regain Calculation
Moisture calculation formulas convert actual net weight into commercial mass using laboratory dry tests. Weighing specimens before and after convective oven drying yields the clean dry fiber content. Adding standard regain percentages, such as eleven percent for wool or eight point five percent for cotton, corrects for atmospheric absorption.
Financial adjustments occur directly from these recalculated figures.
Testing Protocol
Oven drying methods require sealed container transport to maintain specimen integrity prior to testing. Specimen sampling protocols specify taking cores from multiple bales throughout a consignment. Laboratory technicians dry samples at one hundred five degrees Celsius until consecutive weighings show constant weight.
Non-fibrous additives like processing oils get extracted or accounted for depending on contracted terms.
Commercial Settlement
Contractual settlement relies entirely on the final calculated billing mass rather than gross scale measurements at port arrival. Inaccuracies in oven drying or specimen collection distort contract valuations. Shipments tested under ISO 1833 or similar standard methods determine final invoice amounts without further weight adjustments.