Water Retention
Amount of water held within the molecular structure and on the surface of regenerated cellulose fibers affects material weight. Managing viscose rayon moisture levels ensures that yarn and fabric maintain stable dimensions during cutting and sewing. This property is measured as a percentage of the bone dry weight of the fiber.
Dimensional Stability
Fibers swell when the water content increases, leading to changes in the drape and hand of the finished garment. High levels of viscose rayon moisture can cause mold growth if the material is packed while damp.
Invoicing Rule
Standard moisture regain for this fiber is set at approximately 13 percent for commercial transactions. Sellers adjust the gross weight of a shipment to account for the actual viscose rayon moisture measured at the time of dispatch. This ensures that the buyer is not paying for excess water absorbed during transit or storage in humid warehouses.
Verification Method
Precision ovens or electronic moisture meters are used to determine the water content of bulk lots. To find the true viscose rayon moisture, a sample is weighed, dried at 105 degrees Celsius until the weight is constant, and then weighed again. The difference between the initial and final mass reveals the total water present.
Maintaining a controlled laboratory environment at 20 degrees Celsius and 65 percent relative humidity is necessary for consistent results across different testing batches. Accurate moisture data prevents financial loss during the procurement of cellulose fibers.
