EN ISO 9053-1:2026

• Abstract:

  This document specifies the measurement of the determination of the static airflow resistance (see also References[1]and2) in a laminar flow regime, of porous materials for acoustical applications.

• Status: Published
• Publication Date: 09-Jun-2026
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: CEN/TC 126 - Acoustic properties of building products and of buildings
• Drafting Committee: CEN/TC 126 - Acoustic properties of building products and of buildings
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Jun-2026
• Completion Date: 10-Jun-2026
• Ref Project: SIST EN ISO 9053-1:2026 - Acoustics - Determination of airflow resistance - Part 1: Static method (ISO 9053-1:2026)

• Replaces: EN ISO 9053-1:2018 - Acoustics - Determination of airflow resistance - Part 1: Static airflow method (ISO 9053-1:2018)
• Effective Date: 05-Nov-2024
• Referred By: CEN/TR 15226:2006 - Building products - Treatment of acoustics in product technical specifications
• Effective Date: 17-Jun-2026
• Referred By: EN 13162:2012+A1:2015 - Thermal insulation products for buildings - Factory made mineral wool (MW) products - Specification
• Effective Date: 17-Jun-2026
• Referred By: EN 15101-1:2013 - Thermal insulation products for buildings - In-situ formed loose fill cellulose (LFCI) products - Part 1: Specification for the products before installation
• Effective Date: 17-Jun-2026
• Referred By: EN 13170:2012+A1:2015 - Thermal insulation products for buildings - Factory made products of expanded cork (ICB) - Specification
• Effective Date: 17-Jun-2026
• Referred By: EN 13171:2012+A1:2015 - Thermal insulation products for buildings - Factory made wood fibre (WF) products - Specification
• Effective Date: 17-Jun-2026
• Referred By: EN 14064-1:2018 - Thermal insulation products for buildings - In-situ formed loose-fill mineral wool (MW) products - Part 1: Specification for the loose-fill products before installation
• Effective Date: 17-Jun-2026
• Referred By: EN 15101-1:2013+A1:2019 - Thermal insulation products for buildings - In-situ formed loose fill cellulose (LFCI) products - Part 1: Specification for the products before installation
• Effective Date: 17-Jun-2026
• Consolidated By: ISO 9053-1:2026 - Acoustics — Determination of airflow resistance — Part 1: Static method
• Effective Date: 12-Feb-2026

EN ISO 9053-1:2026 is the CEN adoption of ISO 9053-1:2026 for acoustics. It specifies a static method for measuring airflow resistance in porous materials for acoustical applications, in a laminar flow regime. Engineers, test laboratories, quality managers, and product specifiers use it when they need comparable data for sound-absorbing and insulating materials.

What does EN ISO 9053-1:2026 specify?

EN ISO 9053-1:2026 covers the measurement of static airflow resistance for porous materials used in acoustics. The document is organized into scope, terms and definitions, principle, equipment, test specimens, test procedure, precision, test report, and an informative annex.

Annex	What it covers
Annex A	Estimation of static airflow resistivity from impedance tube measurements

What are the key requirements of EN ISO 9053-1:2026?

EN ISO 9053-1:2026 requires a controlled pressure-drop measurement across a test specimen while air flows through it. In practice, this means the test must be set up so the airflow is steady, unidirectional, and low enough that the result is not distorted by velocity effects.

Measurement principle and equipment

Clause 4 bases the method on the pressure difference between the two free faces of the specimen. Clause 5 requires a measurement cell, a steady airflow source, airflow measurement, differential pressure measurement, and thickness measurement while the specimen is in test position. For users, this means the setup must measure both flow and pressure reliably enough to calculate resistance.

Cell design and airflow control

Clause 5.2 requires a circular or rectangular cell, with a minimum diameter or smallest edge of 29 mm, and enough free space around the specimen to preserve laminar flow. The support under the specimen needs at least 50 % open area and leak-free tapping points. This matters because leaks or flow distortion can change the measured resistance, especially for thin or low-porosity specimens.

Calibration and verification

Clause 5.6 requires measurement of at least one calibrated test specimen before a series of measurements, at least once a day, and after significant environmental or equipment changes. The measured value should agree with the theoretical value within ±10 % before testing unknown specimens. In practice, this is a routine check that the apparatus and software are behaving as expected.

Test specimen preparation

Clause 6 allows circular or rectangular specimens and requires lateral dimensions large enough to contain representative microstructure, or otherwise a minimum diameter of 95 mm or a smallest edge of 90 mm. Thickness shall suit the cell and must not be changed in the cell. If specimens are stacked, their orientation and structure must not be altered. This helps ensure the result reflects the material, not the way the sample was forced into the holder.

Test procedure and calculation

Clause 7 requires the specimen to be sealed at the edges, its thickness to be measured in position, and the test to be run at the smallest possible linear airflow velocity. If stepwise measurements are needed, a constrained regression through the origin is used to determine the specific airflow resistance at the reference velocity. For laboratories, this means the result is tied to a defined low-flow condition rather than an arbitrary operating point.

Precision and reporting

Clause 8 notes reproducibility around 15 % for open-cell foam materials, with larger spread possible for granular materials or semi-closed pores. Clause 9 defines the test report contents, including specimen details, cell geometry, flow velocities, regression method if used, deviations, and unusual observations.

What terms does EN ISO 9053-1:2026 define?

• Airflow resistance (R) - the pressure difference across a specimen divided by the volumetric airflow rate through it.
• Specific airflow resistance - airflow resistance related to specimen area, which makes results comparable across different specimen sizes.
• Airflow resistivity (σ) - specific airflow resistance related to thickness, used as a material property for homogeneous materials.
• Linear airflow velocity (u) - airflow rate divided by area, used to describe the test level.
• Permeability (k) - a material property linked to airflow resistivity for homogeneous materials.
• Calibration test specimen - a specimen with known behavior used to verify that the test system is performing correctly.

Who uses EN ISO 9053-1:2026?

EN ISO 9053-1:2026 is used by acoustic test laboratories, manufacturers of porous and sound-absorbing materials, and building-acoustics specialists. Quality managers and buyers use it to compare batches, check supplier data, and confirm that reported airflow resistance values come from a controlled and repeatable method.

What changed in EN ISO 9053-1:2026 from the previous edition?

EN ISO 9053-1:2026 supersedes EN ISO 9053-1:2018. The stated technical changes are a correction to Figure 1 and the addition of a note on designing calibration specimens in 5.6.

What does the EN ISO 9053-1:2026 document contain?

The document includes the measurement principle, equipment requirements, specimen preparation rules, a step-by-step test procedure, precision information, and reporting requirements. It also defines the key quantities used in airflow-resistance work and gives the formula-based relationships needed to derive specific airflow resistance and airflow resistivity. Annex A provides a way to estimate static airflow resistivity from impedance tube measurements, which is useful for consistency checks and for thin materials such as textiles or perforated plates. The document also includes calibration-specimen examples and a figure showing the basic pressure-drop principle.

SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN ISO 9053-1:2019
Akustika - Ugotavljanje upornosti zračnemu toku - 1. del: Statična metoda (ISO
9053-1:2026)
Acoustics - Determination of airflow resistance - Part 1: Static method (ISO 9053-1:2026)
Akustik - Bestimmung des Strömungswiderstandes - Teil 1: Statisches Verfahren (ISO
9053-1:2026)
Acoustique - Détermination de la résistance à l'écoulement de l'air - Partie 1: Méthode
statique (ISO 9053-1:2026)
Ta slovenski standard je istoveten z: EN ISO 9053-1:2026
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9053-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2026
EUROPÄISCHE NORM
ICS 17.140.01; 91.100.60 Supersedes EN ISO 9053-1:2018
English Version
Acoustics - Determination of airflow resistance - Part 1:
Static method (ISO 9053-1:2026)
Acoustique - Détermination de la résistance à Akustik - Bestimmung des Strömungswiderstandes -
l'écoulement de l'air - Partie 1: Méthode statique (ISO Teil 1: Statisches Verfahren (ISO 9053-1:2026)
9053-1:2026)
This European Standard was approved by CEN on 4 June 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9053-1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9053-1:2026) has been prepared by Technical Committee ISO/TC 43
"Acoustics" in collaboration with Technical Committee CEN/TC 126 “Acoustic properties of building
elements and of buildings” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2026, and conflicting national standards
shall be withdrawn at the latest by December 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 9053-1:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 9053-1:2026 has been approved by CEN as EN ISO 9053-1:2026 without any
modification.
International
Standard
ISO 9053-1
Second edition
Acoustics — Determination of
2026-05
airflow resistance —
Part 1:
Static method
Acoustique — Détermination de la résistance à l'écoulement de
l'air —
Partie 1: Méthode statique
Reference number
ISO 9053-1:2026(en) © ISO 2026

ISO 9053-1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 9053-1:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Equipment . 3
5.1 General .3
5.2 Measurement cell .3
5.3 Device for producing airflow .4
5.4 Device for measuring volumetric airflow .4
5.5 Device for measuring differential pressure .4
5.6 Use of calibration test specimens .5
6 Test specimens . 5
6.1 Shape .5
6.2 Dimensions .6
6.2.1 Lateral dimensions .6
6.2.2 Thickness .6
6.3 Number of test specimens .6
7 Test procedure . 6
8 Precision . 7
9 Test report . 7
Annex A (informative) Estimation of the static airflow resistivity . 8
Bibliography . 9

iii
ISO 9053-1:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building
acoustics, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 126, Acoustic properties of building elements and of buildings, in accordance with the Agreement on
technical cooperation between ISO and CEN (Vienna Agreement).
This second edition of ISO 9053-1 cancels and replaces the first edition (ISO 9053-1:2018), which has been
technically revised.
The main changes are as follows:
— Figure 1 was corrected;
— addition of a Note to design calibration specimens in 5.6.
A list of all parts in the ISO 9053 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
International Standard ISO 9053-1:2026(en)
Acoustics — Determination of airflow resistance —
Part 1:
Static method
1 Scope
This document specifies the measurement of the determination of the static airflow resistance (see also
References [1] and [2]) in a laminar flow regime, of porous materials for acoustical applications.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
airflow resistance
R
quantity defined by
p
R
q
v
where
Δp is the air pressure difference, in pascal, across the test specimen with respect to the atmosphere;
q is the volumetric airflow rate, in cubic metres per second, passing through the test specimen.
v
Note 1 to entry: It is expressed in pascal second per cubic metre.
3.2
specific airflow resistance
R
s
quantity defined by
RR= ·A
s
where
R is the airflow resistance, in pascal second per cubic metre, of the test specimen
A is the cross-section area, in square metres, of the test specimen perpendicular to the direction
of flow
Note 1 to entry: It is expressed in pascal second per metre.

ISO 9053-1:2026(en)
3.3
airflow resistivity
σ
quantity defined by the following formula if the material is considered as being homogeneous
R
s
 
d
where
R is the specific airflow resistance, in pascal second per metre, of the test specimen
s
d is the thickness, in metres, of the test specimen in the direction of flow
Note 1 to entry: lt is expressed in pascal second per square metre.
3.4
linear airflow velocity
u
quantity defined by
q
v
u=
A
where
q is the volumetric airflow rate, in cubic metres per second, passing through the test specimen;
v
A is the cross-sectional area, in square metres, of the test specimen.
Note 1 to entry: lt is expressed in metres per second.
3.5
permeability
k
quantity defined by the following equation if the material is considered as being homogeneous

k 

where
−5
η is the dynamic viscosity of air in newton second per square metre (approximately 1,82 × 10
for the air at 20 °C and 101 325 Pa of static pressure);
σ is the static airflow resistivity in pas
...