Calculating Raw Fibre Yield and Net Yarn Conversion Costs
Raw fiber yield calculations require converting gross lot weight to dry commercial mass under ISO 6741 and deducting mechanical waste extractions.
IWTO 19 Clean Yield
Fiber Content
Scientific benchmarks define the quantity of pure wool available from a raw consignment after typical commercial processing. An iwto 19 clean yield value quantifies the remaining mass once moisture, wax and vegetable matter are mathematically subtracted from the greasy weight. This figure sets the definitive price for international greasy wool auctions where buyers calculate the actual cost of usable material.
Formula Constants
Adjustment factors account for the expected loss during industrial scouring and combing based on the measured vegetable matter. When raw results are converted to an iwto 19 clean yield basis, they provide a standardized percentage that works across different processing routes. The test begins by taking small core samples from bales to obtain a representative cross section of the entire lot.
Commercial Valuation
Price transparency in the wool trade relies entirely on this certified yield figure. Since greasy wool may contain fifty percent weight in dirt or grease, the iwto 19 clean yield certificate provides the primary insurance that a manufacturer gets the material they paid for. Verification happens at accredited labs located near primary export docks.
Lot Settlement
Final invoices reflect the clean weight derived from this calculation rather than the bulk physical weight recorded on the scales. Using iwto 19 clean yield values prevents disputes over shipping costs for non usable impurities. Every certificate provides a breakdown of the specific vegetable components found during the analysis.