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ISO/FDIS 4638

Polymeric materials, cellular flexible — Determination of air flow permeability

General information

50.20     Aug 7, 2026

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

PROJECT
ISO/FDIS 4638
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Aug 7, 2026

National adoptions

naSRPS EN ISO 4638:2026  
ISS

Polymeric materials, cellular flexible - Determination of air flow permeability (ISO/FDIS 4638:2026)

40.20   DIS ballot initiated: 12 weeks

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