ISO 7231:2023

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

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ISO 7231:2023

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

PUBLISH DATE 2023
ISO 7231:2023

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 1Β Air flow values can be used to give an indication of the effects of formulation and production variables on the cellular structure.

NOTE 2Β In this document, the expression β€œconventional type of flexible cellular polymeric material” means types which are unsuitable for sealing purposes.

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