1 Scope
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:
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.