Mass Standard
Standardized testing protocols define precise laboratory methods for determining the mass per unit area of paper and paperboard expressed in grams per square meter. Compliance with TAPPI T410 grammage requires conditioning test specimens under controlled temperature and humidity before precision weighing and area measurement. This metric governs structural weight verification, establishing the baseline against which commercial weight tolerances of plus or minus five percent are evaluated.
Measurement Method
Conditioning test specimens at twenty-three degrees Celsius and fifty percent relative humidity according to TAPPI T402 ensures moisture equilibrium prior to testing. Laboratory technicians cut minimum sample surface areas, typically one hundred square centimeters or four hundred square inches, using precision die cutters to eliminate edge variations. Analytical balances measure specimen mass to zero point zero zero one grams, which is multiplied by mathematical area factors to calculate mass per square meter.
Grammage directly influences structural properties including bending stiffness, burst strength, and caliper in paperboard packaging grades. Deviations from target grammage alter converting behavior, creasing performance, and shipping package mass.
Commercial Specification
Verifying delivered paperboard weight against purchase agreements prevents financial disputes regarding ream weight and yield calculations. Accurate mass measurement underpins quality control across paper manufacturing and packaging converting lines. Standardized grammage metrics provide a universal basis for global paper trading.
