Moisture Adjustment
A mathematical multiplier applied to the oven-dry weight of a textile sample accounts for the standard moisture regain of specific fiber types. This dry mass correction factor converts dry weight to commercial weight for transactional and analytical purposes. It ensures fair pricing across global supply chains.
Regain Calculation
Each textile fiber possesses a unique standard moisture regain value defined by international trade agreements and national standards. When calculating the commercial mass, the dry mass correction factor is computed by adding one hundred to the regain percentage and dividing by one hundred. For example, cotton uses a different factor than polyester because natural fibers absorb much more atmospheric moisture.
Laboratories perform this correction after heating the sample to a constant weight at one hundred and five degrees Celsius.
Testing Procedure
Yarn shipments are sampled and dried in ventilated ovens to eliminate all moisture before calculations begin. The resulting dry weight establishes the baseline for applying the correction multiplier. This procedure eliminates disputes caused by changing environmental humidity.
Commercial Impact
Invoicing for large fiber shipments is based entirely on the corrected commercial weight to prevent overpayment for water weight. Buyers inspect these certificates closely. Applying the dry mass correction factor ensures fair and standardized commercial transactions.
