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

Comment end date 2026-10-12

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Project stage codes

1. Prioritetinių darbo temų pažymėjimas ir ekspertų skyrimas

2. Projektas

3. Viešoji apklausa

From 2026-08-13 till 2026-10-12

4. Closure of enquiry

5. Submission to Formal Vote

Organisation

CEN Europos standartizacijos komitetas

ICS

83.100 - Cellular materials

Technical Committee

TK 68 Plastics

ForeignTC'S

CEN/TC 249

Number of comments

Comment start date

2026-08-13

Scope

This document specifies a method for the determination of the permeability of flexible cellular polymeric materials to air flow. It is applicable to test pieces cut from products of cellular material. NOTE ISO 7231 [6] specifies a simple quality control method which is also based on the flow of air through cellular materials. This can be used when it is not the intention to calculate the intrinsic properties of various materials in order to compare them, but merely to control the quality of a given cellular material.

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Pakeis

prEN ISO 4638