Commercial Standard
Standardized commercial trade conventions establish permissible weight adjustments to account for legal moisture regain and packaging tare in raw textile fibers. Fiber merchants apply a net mass allowance when billing bulk shipments of scoured wool or spun cotton yarns. The adjustment defines the official invoice weight by adding standard moisture regain to oven-dry fiber mass while excluding container tare.
Regain Calculation
Laboratory testing measures moisture content by drying sample fiber lots in specialized testing ovens. Official regain percentages are added back to the dry mass to establish commercial net weight. Wool fibers carry a higher official moisture regain percentage than synthetic filament yarns under international trade rules.
Calculating invoice weight without standardized regain adjustments causes financial disputes between spinning mills and fiber traders.
Billing Adjustment
Commercial invoices reflect adjusted net weights rather than uncorrected scale readings from dock balances. Trade agreements specify exact regain percentages for each fiber type.
Verification Check
Quality control labs sample incoming bales to confirm actual moisture levels against contractual regain specifications. Discrepancies exceeding allowable tolerances adjust total invoice balances prior to final payment authorization. Applying standardized commercial testing maintains financial fairness when trading net mass allowance commodities across international markets.
