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standard by International Organization for Standardization, 10/01/2011
ISO 11093-7:2011 specifies a method for the determination, by the three-point method, of the flexural modulus of cylindrical paper and board cores, which meet the following criteria:
internal diameter: 50 mm to 350 mm;minimum wall thickness: 0,05 x internal diameter, but not less than 10,0 mm;minimum length of core: 10 x internal diameter, but not less than 1 000 mm.