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

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

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1   Scope

This International Standard 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.

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 International Standard, the expression “conventional type of flexible cellular polymeric material” means types which are unsuitable for sealing purposes.