Standard Laboratory Conditioning Protocols for Coated Folding Boxboard Evaluation
Valid boxboard physical testing requires ISO 187 conditioning at 23°C and 50% RH to prevent hysteresis errors in stiffness, yield, and creasing metrics.
Commercial Mass Adjustment
Billing Weight
Calculation of the invoiced weight of paper shipments based on a standardized moisture content represents a standard trade practice in global bulk transactions. This commercial mass adjustment adjusts the actual scale weight to a theoretical weight calculated at a contracted moisture level, typically between four and nine percent. Buyers and sellers agree on this standard reference to neutralize the financial effect of water loss or absorption during transport.
Moisture Factor
Humidity variations during transit alter the physical weight of fiber rolls without changing the dry fiber mass. When a roll loses moisture, its scale weight drops, whereas high humidity increases the weight. By converting the actual scale weight to the commercial mass adjustment equivalent, transactions remain based on the dry fiber content.
This calculation uses the ratio between the measured moisture and the contractually agreed percentage. For example, if a batch arrives with seven percent moisture but the contract specifies eight percent, the commercial mass adjustment increases the invoiced weight to compensate for the lost water, ensuring the mill is paid for the correct fiber amount.
Financial Settlement
Invoicing based on adjusted weight prevents disputes over weight discrepancy claims between the mill and the converter. The buyer pays for the actual dry fiber rather than water. A typical consignment of fifty tonnes may vary by several hundred kilograms due to atmospheric exposure.
Resolving these variances through the commercial mass adjustment secures a fair transaction value for both parties.