Official Moisture Regain Calculations for Binary Fiber Mixture Customs Declarations
Official moisture regain calculations convert anhydrous dry mass into legal commercial mass to determine chief weight tariff lines for binary fibre imports.
Wool Regain Factor
Natural Hygroscopicity
The exceptional ability of natural protein fibres to absorb atmospheric moisture without feeling damp is a defining characteristic of fleece textiles. This wool regain factor represents the officially recognized moisture percentage, which can reach up to eighteen and a quarter percent for scoured wool. It is the highest standard regain value among major natural and synthetic apparel fibres, making moisture management a primary concern for wool merchants.
Commercial Weight
Trade agreements for bulk wool purchases rely on a calculated weight that assumes a standard moisture content. Applying the wool regain factor allows buyers to determine the dry clean wool content of a shipment, which is the actual amount of fibre being purchased. This removes the influence of changing weather conditions during transport and warehouse storage.
Quality Control
Excess moisture in raw wool can lead to microbial growth, fiber degradation and unpleasant odors during shipping. Measuring the wool regain factor during processing ensures that the wool is stored within safe limits before spinning. Maintaining the correct moisture level also improves the efficiency of spinning and yarn processing.
Invoice Settlement
Financial disputes are avoided by adjusting the billed weight of the yarn or raw fibre according to lab-certified moisture tests. When the tested moisture content exceeds the official wool regain factor, the invoice price is reduced to reflect the excess water weight. This standardized adjustment protects the financial interests of both yarn spinners and apparel brands.