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ISO/DIS 4638

Polymeric materials, cellular flexible — Determination of air flow permeability

General information

40.99     Dec 23, 2025

ISO

ISO/TC 45/SC 4

International Standard

83.100  

Scope

Applicable to test pieces cut from products of cellular materials. Useful for two purposes: a) studying the structure of cellular products in connection with their physical properties and their method of manufacture and b) ensuring product quality (quality assurance). Describes principle, apparatus, test piece and conditions, procedure and calculation and expression of the results. Three figures deliver the details for testing.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 4638:1984

NOW

IN_DEVELOPMENT
ISO/DIS 4638
40.99 Full report circulated: DIS approved for registration as FDIS
Dec 23, 2025