The SITC schedule uses grammage bands to separate kraft paper and paperboard into distinct headings. Product weighing 150 g/m² or less falls under 64146, while heavier grades fall into 64147 or 64148. Mill-certified basis-weight test reports are typically required at entry to confirm which band applies, and misclassification between bands can result in duty discrepancies.

Lightweight uncoated kraft in this grammage range is frequently used as a base sheet for wax or polyethylene extrusion coating, as interleaving material in metal or glass manufacturing, and as inner plies in multiwall sack construction. Its relatively low weight keeps converting costs down while still providing the tensile strength associated with kraft pulp.