ISO 7231:2023

Polymeric materials, cellular, flexible — Determination of air flow value at constant pressure-drop

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.

Edition	2023
Published Date	2023
Published By	International Standardization Organisation
Page Count	14