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ISO 8791-4:2007 Paper and board - Determination of roughness/smoothness (air leak methods) - Part 4: Print-surf method
standard by International Organization for Standardization, 11/01/2007
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ISO 8791-4:2007 specifies a method for determining the roughness of paper and board using an apparatus which complies with the Print-surf method, as defined in ISO 8791-4:2007. It is applicable to all printing papers and boards with which it is possible to form a substantially airtight seal against the guard lands of the measuring head.