Regain Standard
Official moisture regain values for commercial textile materials are established by a Chinese national standard. GB/T 9994 provides the specific percentages used to calculate the conventional mass of fibers and yarns during trade transactions. These figures represent the weight of water that a bone dry material is expected to absorb under standard atmospheric conditions.
Trade Application
Domestic and international suppliers use these tables to ensure that invoices reflect the weight of the actual fiber. These values exclude the mass of excess water present in the shipment. The GB/T 9994 values differ for natural fibers like silk and cotton compared to synthetic polymers such as polyester or nylon.
Accurate application of these rates prevents disputes over shipment weights and material costs.
Calculation Method
Laboratories combine these regain values with the results from oven dry tests to reach a final commercial weight. While other international standards exist, GB/T 9994 remains the mandatory reference for goods sold within the Chinese market. Mills must declare the regain rate used when submitting test reports for fiber composition.
Legal Reference
Contractual agreements often cite this document to define how weight discrepancies are resolved. Adherence to GB/T 9994 ensures transparency in the pricing of raw materials and finished yarns.
