SIST 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
• Public Enquiry End Date: 24-Jul-2025
• Publication Date: 16-Aug-2026
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: AKU - Acoustics
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Jun-2026
• Due Date: 29-Aug-2026
• Completion Date: 17-Aug-2026
• Ref Project: EN ISO 9053-1:2026 - Acoustics - Determination of airflow resistance - Part 1: Static method (ISO 9053-1:2026)

• Replaces: SIST EN ISO 9053-1:2019 - Acoustics - Determination of airflow resistance - Part 1: Static airflow method (ISO 9053-1:2018)
• Effective Date: 01-Sep-2026
• Referred By: SIST 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
• Referred By: SIST EN 14064-1:2019 - 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: SIST 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: SIST EN 13171:2013+A1:2015 - Thermal insulation products for buildings - Factory made wood fibre (WF) products - Specification
• Effective Date: 17-Jun-2026
• Referred By: SIST EN 13162:2013+A1:2015 - Thermal insulation products for buildings - Factory made mineral wool (MW) products - Specification
• Effective Date: 17-Jun-2026
• Referred By: SIST-TP CEN/TR 15226:2006 - Building products - Treatment of acoustics in product technical specifications
• Effective Date: 17-Jun-2026
• Referred By: SIST EN 13170:2013+A1:2015 - Thermal insulation products for buildings - Factory made products of expanded cork (ICB) - Specification
• Effective Date: 17-Jun-2026

SIST EN ISO 9053-1:2026 is the Slovenian adoption of EN ISO 9053-1:2026, based on ISO 9053-1:2026. It specifies how to measure the static airflow resistance of porous materials for acoustical applications in a laminar flow regime. Laboratories, acoustic product manufacturers, and quality teams use it to test materials and report results in a consistent way.

What does SIST EN ISO 9053-1:2026 specify?

SIST EN ISO 9053-1:2026 covers the direct measurement of static airflow resistance for porous acoustic materials. The method is aimed at controlled, unidirectional flow through a specimen, so the results are suitable for comparing sound-absorbing and insulating materials under the same test conditions.

The document is organized into clauses 1 to 9, followed by Annex A.

Annex	What it covers
Annex A	Estimation of the static airflow resistivity from impedance tube measurements at low frequencies

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

SIST EN ISO 9053-1:2026 builds the measurement around a pressure drop across a specimen while air flows through it. In practice, the method is only meaningful if the airflow is steady, the specimen fits the cell well, and the measurement is taken at very low flow velocity so the result stays representative of acoustic use.

• Clause 4, principle - The test measures the pressure difference between the two free faces of the specimen under controlled flow. This matters because the reported resistance must come from the specimen itself, not from unstable flow conditions.
• Clause 5, equipment - The setup needs a measurement cell, a steady airflow source, devices for volumetric airflow and differential pressure, and thickness measurement in the test position. The flow, pressure and thickness instruments should be calibrated at least every 2 years.
• Clause 5.2, measurement cell - The cell can be circular or rectangular, with a minimum diameter or smallest edge of 29 mm, and it must support essentially laminar flow. The support under the specimen must have at least 50 % open area, with holes at least 3 mm in diameter, so the support does not dominate the measurement.
• Clause 5.6, calibration test specimens - At least one calibrated specimen is measured before testing and then after relevant changes or at least once a day. The measured value should agree with the theoretical value within ±10 % before unknown specimens are tested, which is a practical hardware and software check.
• Clause 6, test specimens - Specimens may be circular or rectangular, but their lateral size must be large enough to represent the material structure. If no microstructure data are available, the document gives minimum specimen sizes; it also allows stacking only when the microscopic structure is not altered.
• Clause 7, test procedure - The specimen edges must be sealed, thickness is measured in position, and the airflow resistance is measured at the smallest possible linear airflow velocity, with 0.5 × 10^-3 m/s recommended. If stepped measurements are needed, a regression of at least second order through the origin is used to determine the value at that velocity.
• Clause 8 and Clause 9 - The document notes interlaboratory reproducibility around 15 % for open-cell foam materials, while other structures may vary more because of leakage or compression. The test report must record the specimen, test conditions, flow velocities, regression method, deviations, and unusual observations.

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

SIST EN ISO 9053-1:2026 defines the main quantities used to describe airflow through porous materials.

• Airflow resistance (R) - The pressure difference across the specimen divided by the volumetric airflow rate; it expresses how strongly the specimen resists flow.
• Specific airflow resistance - Airflow resistance related to specimen cross-sectional area; this lets users compare specimens of different sizes.
• Airflow resistivity (σ) - Specific airflow resistance related to thickness, used when the material is treated as homogeneous.
• Linear airflow velocity (u) - The volumetric airflow rate divided by cross-sectional area; it is the flow speed used to set the test point.
• Permeability (k) - A derived material property linked to airflow resistivity for homogeneous materials.
• Volumetric airflow rate (q) - The volume of air passing through the specimen per second, used together with pressure difference to calculate resistance.

Who uses SIST EN ISO 9053-1:2026?

SIST EN ISO 9053-1:2026 is used by acoustic test laboratories, product developers, and quality control teams working with porous materials. It is relevant for manufacturers of acoustic insulation, sound-absorbing foams, fibrous materials, non-wovens, perforated plates, and similar products.

It also helps engineering, purchasing, and specification teams compare materials on the same basis. In practice, they use it to verify incoming materials, support product data sheets, and document acoustic testing for building and industrial applications.

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

SIST EN ISO 9053-1:2026 replaces SIST EN ISO 9053-1:2019, and the European text supersedes EN ISO 9053-1:2018. The foreword states two technical changes: Figure 1 was corrected, and a note was added in 5.6 for designing calibration specimens.

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

SIST EN ISO 9053-1:2026 contains the scope, terms and definitions, the test principle, equipment requirements, specimen requirements, the test procedure, precision information, and the test report content. It also includes Figure 1 showing the basic principle of the method and formulas used for airflow-related quantities and support or calibration specimen calculations.

Annex A gives an alternative way to estimate static airflow resistivity from low-frequency impedance tube measurements. That annex is useful for consistency checks and for thin materials where direct testing can be difficult, especially when the result needs to be checked for leakage or other setup effects.

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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CH-1214 Vernier, Geneva
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
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
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
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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this may not represent the latest information, which may be obtained from the patent database available at
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
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
...