EN ISO 7231:2023

This document specifies two methods for determining the air flow value of flexible cellular polymeric materials:— methodA, for conventional types of flexible cellular polymeric material;— methodB, for all types of flexible cellular polymeric material, but especially for materials with a low permeability to air.For method B, two methods are specified in this document:— method B1: with manual measurement;— method B2: with automatic measurement.NOTE1 Air flow values can be used to give an indication of the effects of formulation and production variables on the cellular structure.NOTE2 In this document, the expression “conventional type of flexible cellular polymeric material” means types which are unsuitable for sealing purposes.