AS/NZS 1301.431rp:2006

This standard prescribes the procedure for measuring the bending resistance of paper or paperboard using the Taber stiffness tester. Although this instrument is called a stiffness tester, it cannot be used to measure stiffness because most paper and paperboard materials, when tested according to this method, are bent beyond their elastic limit. Bending resistance is defined as the force required to bend, under specified conditions, a rectangular test piece of the paper or paperboard which is clamped at one end. The method is applicable to paper and paperboard having a bending resistance value in the range 10 to 9000 mN.
NOTE 1 – Bending stiffness of paper and paperboard is defined as the moment of resistance per unit width that a paper or paperboard offers to bending within the limits of elastic deformation (see Foreword).
The apparatus and the procedure in this Standard are written specifically for the Taber model 150-B stiffness tester.