Moisture Standard
Standardized laboratory testing provides the foundational baseline for determining the moisture content of textile materials. In the international trade of flax, the protocol described in astm d1576 establishes the criteria for measuring moisture loss by heating samples in a ventilated oven until they reach a constant mass. The procedure prevents disagreements between spinning mills and fiber suppliers regarding the net dry weight of raw flax shipments.
The certified percentage guides subsequent calculation of the commercial mass.
Drying Procedure
Laboratory technicians extract representative specimens from incoming raw flax bales before exposure to the ambient mill environment alters their moisture level. These specimens undergo heating at temperatures between one hundred and five and one hundred and ten degrees Celsius. Continuous weighing continues until successive measurements show no further change in mass.
Reaching this constant weight indicates that all free water has evaporated. The difference between the initial mass and the oven-dry mass represents the moisture content.
Financial Adjustment
Accurate moisture determination directly influences the transaction value of raw linen materials. Because flax fiber is highly hygroscopic, shipments can absorb atmospheric water during ocean transit, which increases their weight without adding material value. The mill uses the oven-drying results to calculate the dry weight plus the standard commercial allowance.
The calculated weight forms the basis of the final invoice. Excess moisture leads to a discount on the supplier bill, protecting the mill from paying for water weight. Conversely, dry shipments that fall below the agreed tolerance do not incur penalties if the difference remains within the narrow boundaries defined by the sales contract.
