scope:

This International Standard refers to the relevant International Standards to be used for the determination of physical properties of laboratory sheets made of pulp. It is intended for laboratory sheets prepared in accordance with ISO 5269-1[1] , ISO 5269-2[2] or ISO 5269-3[3] and it is left to the pulp producer and the pulp user to agree upon which properties are relevant to be tested. For determination of physical properties, ISO 5270 refers to the relevant International Standards for the description and calibration of the required equipment, and for the calculation and reporting of results. This International Standard, however, specifies the procedures for testing laboratory sheets where the amount of material is limited, compared to testing of paper and board to which the relevant International Standards referred to are applicable, and for that reason there may be a discrepancy. This International Standard includes tests on both "low grammage" sheets and "high grammage" sheets, prepared in accordance with ISO 5269-1, ISO 5269-2 or ISO 5269-3. The oven-dry grammage of the "low grammage" sheets shall be (60 ± 2) g/m2 (using conventional sheet former as described in ISO 5269-1 and ISO 5269-3) or (75 ± 2) g/m2 (using Rapid-Köthen sheet former as described in ISO 5269-2 and ISO 5269-3). The oven-dry grammage of the "high grammage" sheets shall be 140 g/m2, with a tolerance of 3 % (using conventional and Rapid Köthen sheet formers), except for z-directional tensile strength where the grammage shall be >90 g/m2.