ISO 536

Gravimetric Procedure

Specimen preparation begins by conditioning cut sheets in controlled atmospheres of twenty three degrees Celsius and fifty percent relative humidity. Executing iso 536 involves cutting multiple square or circular samples using high precision punch cutters to guarantee accurate surface boundaries. Analytical balances record sample weights to within one milligram precision.

Dividing the recorded mass by the exact specimen surface area yields grammage expressed in grams per square meter. Averages across multiple cross web samples eliminate local basis weight variations caused by headbox flow deviations.

Production Tolerances

High speed converting equipment requires consistent substrate grammage to maintain uniform creasing depth, folder gluer transport speed and adhesive absorption. Substrates verified under iso 536 allow carton manufacturers to detect basis weight drift before starting large print campaigns. Solid bleached sulfate boards, coated recycled boards and fluting mediums require tight grammage windows to prevent die cutting wear and scoring cracks.

Invoicing disputes resolve directly through these standardized mass measurements. Consistent grammage guarantees predictable performance across industrial packaging conversion lines.