BS ISO 8791-4:2021

This standard BS ISO 8791-4:2021 Paper and board. Determination of roughness/smoothness (air leak methods) is classified in these ICS categories:

• 85.060 Paper and board

This document specifies a method for determining the roughness of paper and board using an apparatus which conforms to the Print-surf method, as defined in this document. 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.