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standard by International Organization for Standardization, 12/01/1997
This part of ISO 11093 specifies a method for the determination 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: 0,02 internal diameter or not less than 2,0 mm;minimum length of core: 8 internal diameter or not less than 1000 mm.