Moisture Regain Percentage

Contractual Standardisation

Technical specifications identify specific regain levels for different fibre types, such as cotton, wool, or polyester, to maintain consistency across global supply chains. Mills apply these constants during the weighing of processed goods to convert the actual mass of a damp delivery into a fixed quantity agreed upon at the point of purchase. Discrepancies between the laboratory test results and the field measurement often trigger price revisions for the lot.

Hydration Mechanism

Water molecules bind to the amorphous regions of polymer chains within the fibre structure through hydrogen bonding. Fibre swelling occurs as more moisture enters these regions, which alters the physical dimensions and tensile strength of the strand. Heat applied during the drying phase breaks these bonds and evaporates the liquid to reach an absolute bone dry mass, which provides the denominator for the final percentage.

Measurement Protocol

Technicians determine the value by weighing a sample before and after oven drying until the mass remains stable over two consecutive checks. This verification prevents fraudulent claims regarding the water content of raw materials or finished yarn packages. Standardised testing procedures maintain the integrity of trade by defining the precise conditions for these measurements.

Accurate reporting of these figures ensures that the final weight of delivered textile goods reflects the underlying dry fibre mass.