ISO/FDIS 4638

Polymeric materials, cellular flexible — Determination of air flow permeability

General information

Current stage: 50.00 Effective date: 11 maj 2026

Originator: ISO

Owner: ISO/TC 45/SC 4

Type: International Standard

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/FDIS 4638
50.00 Final text received or FDIS registered for formal approval
11 maj 2026