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ISO 7231:2023
M00003459
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ISO 7231:2023 Polymeric materials, cellular, flexible - Determination of air flow value at constant pressure-drop
standard by International Organization for Standardization, 08/01/2023
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Full Description
This document specifies two methods for determining the air flow value of flexible cellular polymeric materials:— method A, for conventional types of flexible cellular polymeric material;— method B, 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.NOTE 1 Air flow values can be used to give an indication of the effects of formulation and production variables on the cellular structure.NOTE 2 In this document, the expression “conventional type of flexible cellular polymeric material” means types which are unsuitable for sealing purposes.