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Paper and board - Determination of roughness/smoothness (air leak methods) - Part 2: Bendtsen method
ISO 8791-2:2013 specifies a method for the determination of the roughness of paper and board using the Bendtsen apparatus.
Scope of applicability: ISO 8791-2:2013 is applicable to paper and board which have Bendtsen roughness values between about 5 ml/min and 3 000 ml/min when measured with variable-area type testers and between about 50 ml/min and 5 000 ml/min when measured with electronic type testers.
Limitations: It is not suitable for soft papers which allow the land to make a significant impression on the surface, for high-air-permeance papers which allow a significant flow of air to pass through the sheet, or for papers which will not lie flat under the measuring head.
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