ISO 5629:1983

Paper and board — Determination of bending stiffness — Resonance method

Applies to a wide range of papers and boards, but for some materials, such as multi-ply papers and boards, papers and boards with appreciable curl, some soft papers with grammage below about 40 g/m , the measured numerical value may not be strictly identical with the bending stiffness. It does not apply to corrugated boards.