Weight Correction
Mass calculations correct the commercial weight of a textile shipment based on the official moisture content allowed for each fiber type. Applying a moisture regain adjustment ensures that buyers pay for the fiber itself rather than the water absorbed from the atmosphere during transit. This practice is standardized by international trade bodies to provide a fair basis for transactions.
Calculation Formula
The dry weight of the lot is multiplied by a factor representing the legal regain percentage. Through moisture regain adjustment, the recorded mass of a cotton bale or polyester yarn becomes a stable figure for invoicing.
Laboratory Verification
Samples are taken from the bulk and heated in an oven until no further weight loss occurs. The moisture regain adjustment is then applied to the whole batch using the data from these representative specimens. Accuracy depends on taking samples from the center of the containers where the environment is stable.
Trade Compliance
Customs declarations and shipping manifests must reflect these standardized weights to avoid penalties. Consistent use of moisture regain adjustment prevents disputes between mills and garment factories over missing material. Documentation of the ambient conditions during weighing provides a secondary check for the auditors.
