SIST EN ISO 10121-1:2014

Test method for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 1: Gas-phase air cleaning media (ISO 10121-1:2014)

EN ISO 10121-1 aims to provide an objective laboratory test method, a suggested apparatus, normative test sections and normative tests for evaluation of three different solid gas-phase air cleaning media (GPACM) or GPACM configurations for use in gas-phase air cleaning devices intended for general filtration applications. This part of ISO 10121 is specifically intended for challenge testing and not for general material evaluation or pore system characterization. The three different types of GPACM identified in this part of ISO 10121 are GPACM-LF (particles of different shape and size intended for e.g. Loose Fill applications), GPACM-FL (FLat sheet fabric intended for e.g. flat one layer, pleated or bag type devices) and GPACM-TS (three dimensional structures that are many times thicker than flat sheet and e.g. used as finished elements in a device). The tests are conducted in an air stream and the GPACM configurations are challenged with test gases under steady-state conditions. Since elevated gas challenge concentrations (relative to general ventilation applications) are used, test data should be used to compare GPACM within the same configuration and not for the purpose of predicting performance in a real situation. It is also not implied that different GPACM configurations can be directly compared. The primary intention is to be able to compare like GPACM configurations to like, not between GPACM configurations. Testing of complete devices is described in ISO 10121-2. To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is defined: an example is illustrated in Annex C (informative). Instead normative demands for media sample holder design, apparatus properties and validation tests are specified.

Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der Gasphase für die allgemeine Lüftung - Teil 1: Medien zur Reinigung der Gasphase (ISO 10121-1:2014)

Die vorliegende Norm zielt darauf ab, ein objektives Laborprüfverfahren, eine vorgeschlagene Prüfeinrichtung, normative Prüfabschnitte und normative Prüfungen für die Bewertung drei verschiedener Medien zur Reinigung der Gasphase (GPACM) oder GPACM-Zusammensetzungen für die Verwendung in Einrichtungen zur Reinigung der Gasphase für die Anwendung in der allgemeinen Filtration bereitzustellen. Die Norm ist insbesondere für die Eignungsprüfung und nicht für die allgemeine Materialbewertung oder Charakterisierung des Porensystems vorgesehen. Die in der vorliegenden Norm festgelegten drei verschiedenen Typen sind GPACM-LF (Partikel verschiedener Formen und Größen, z. B. für lose Füllanwendungen), GPACM-FL (flache Gewebelagen, z. B. für flache Einschichteinrichtungen, Falteinrichtungen oder Tascheneinrichtungen) und GPACM-TS (dreidimensionale Strukturen, die um ein Vielfaches dicker als flache Lagen sind und z. B. als Fertigelemente in einer Einrichtung verwendet werden). Die Prüfungen werden in einem Luftstrom durchgeführt und die GPACM-Zusammensetzungen werden bei gleichbleibenden Bedingungen mit Prüfgasen geprüft. Da (in Bezug auf die allgemeine Lüftung) erhöhte Prüfgaskonzentrationen  eingesetzt werden, sollten Prüfdaten verwendet werden, um GPACM innerhalb der gleichen Zusammensetzung zu vergleichen und nicht zum Zweck der Vorhersage der Leistung in realen Situationen. Es wird auch nicht ausgesagt, dass verschiedene GPACM-Zusammensetzungen direkt miteinander verglichen werden können. Das primäre Ziel ist der Vergleich gleicher GPACM-Zusammensetzungen und nicht verschiedener GPACM-Zusammen¬setzungen. Die Prüfung von gesamten Einrichtungen ist in ISO/FDIS 10121-2 beschrieben.
Damit die Sachlichkeit für Lieferanten von Prüfeinrichtungen sichergestellt ist, wird keine bestimmte konstruktive Ausführung der Prüfeinrichtung normativ vorgegeben. Anstelle von normativen Anforderungen an die konstruktive Ausführung des Medienprobenhalters werden Geräteeigenschaften und Validierungs-prüfungen festgelegt.

Méthodes d'essai pour l'évaluation de la performance des médias et des dispositifs de filtration moléculaire pour la ventilation générale - Partie 1: Médias de filtration moléculaire (GPACM) (ISO 10121-1:2014)

L'ISO 10121-1:2014 a pour objet de fournir une méthode d'essai en laboratoire objective, un appareillage recommandé, des sections d'essai normatives et des essais normatifs pour l'évaluation de trois différents média de filtration moléculaire (GPACM) ou de configurations de GPACM utilisés dans des dispositifs de filtration moléculaire destinés à des applications de filtration générale. L'ISO 10121-1:2014 concerne spécifiquement les essais et non l'évaluation générale des matériaux ou la caractérisation du système de pores. Les trois types différents de GPACM identifiés dans l'ISO 10121-1:2014 sont le GPACM-LF (particules de différentes formes et tailles destinées par exemple aux applications utilisant un médium en vrac), le GPACM-FL (feuille textile plane destinée par exemple aux dispositifs plans à une seule couche, aux dispositifs plissés ou aux dispositifs à sac) et le GPACM-TS (structures tridimensionnelles beaucoup plus épaisses qu'une feuille plane et utilisées par exemple en tant qu'éléments finis dans un dispositif). Les essais sont réalisés dans un flux d'air et les configurations de GPACM sont soumises à essai avec des gaz d'essai dans des conditions de régime établi. Des concentrations élevées de gaz d'essai (par rapport aux applications de ventilation générale) étant utilisées, il convient d'utiliser les données d'essai pour comparer les GPACM dans la même configuration et non dans le but de prédire les performances en situation réelle. Cela ne signifie pas non plus que différentes configurations de GPACM peuvent être comparées directement. L'objectif principal est de pouvoir comparer des configurations de GPACM similaires et non des configurations de GPACM différentes. Les essais relatifs aux dispositifs complets sont décrits dans l'ISO 10121.
Pour garantir l'objectivité vis-à-vis des fournisseurs d'équipement d'essai, aucune conception spécifique de l'appareillage d'essai n'est normalisée: un exemple est donné en annexe. En revanche, les exigences normatives relatives à la conception du porte-échantillon pour média, aux propriétés des appareils et aux essais de validation sont spécifiées.

Preskusne metode za ocenjevanje lastnosti sredstev in naprav za čiščenje zraka v plinski fazi za splošno prezračevanje - 1. del: Sredstva za čiščenje zraka v plinski fazi (ISO 10121-1:2014)

Cilj standarda EN ISO 10121-1 je zagotoviti objektivno laboratorijsko preskusno metodo, predlagane aparate, normativne preskusne dele in normativne preskuse za ovrednotenje treh različnih sredstev za čiščenje zraka v plinski fazi (GPACM) ali konfiguracij GPACM, ki se uporabljajo v napravah za čiščenje zraka v plinski fazi za splošno prezračevanje. Ta del standarda ISO 10121 je posebej namenjen preskušanju ustreznosti in ne splošni oceni materiala ali karakterizaciji pornega sistema. Trije različni tipi GPACM, opredeljeni v tem delu standarda ISO 10121, so GPACM-LF (delci različnih oblik in velikosti, namenjeni npr. za uporabo kot prosto polnilo), GPACM-FL (plosko blago, namenjeno npr. za ploske enoslojne, plisirane ali vrečaste naprave) ter GPACM-TS (tridimenzionalne strukture, ki so veliko debelejše od ploskega materiala in se npr. uporabljajo kot končni elementi v napravi). Preskusi se izvajajo v toku zraka, konfiguracije GPACM pa se preskusijo s preskusnimi plini pri ustaljenih pogojih. Ker se pri preskušanju uporabljajo povišane koncentracije plinov (glede na uporabo med splošnim prezračevanjem), naj bi se preskusni podatki uporabili za primerjavo GPACM znotraj enake konfiguracije in ne za namen predvidevanja lastnosti v resničnih razmerah. Prav tako se ne predvideva, da je mogoče različne konfiguracije GPACM neposredno primerjati. Glavni namen je omogočiti primerjavo podobnih konfiguracij GPACM s podobnimi konfiguracijami, ne pa med konfiguracijami GPACM. Preskušanje celotnih naprav je opisano v standardu ISO 10121-2. Da bi se zagotovila objektivnost za dobavitelje preskusne opreme, posebna zasnova preskusnih aparatov ni določena: primer je prikazan v dodatku C (informativno). Namesto normativnih zahtev za zasnovo držala vzorca sredstva so določene lastnosti aparatov in preskusi za potrjevanje.

General Information

• Status: Published
• Public Enquiry End Date: 24-Jul-2012
• Publication Date: 04-Sep-2014
• ICS: 13.040.99 - Other standards related to air quality
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Aug-2014
• Due Date: 10-Oct-2014
• Completion Date: 05-Sep-2014
• Ref Project: EN ISO 10121-1:2014 - Test method for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 1: Gas-phase air cleaning media (ISO 10121-1:2014)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 10121-1:2014
01-oktober-2014
3UHVNXVQHPHWRGH]DRFHQMHYDQMHODVWQRVWLVUHGVWHYLQQDSUDY]DþLãþHQMH]UDNDY
SOLQVNLID]L]DVSORãQRSUH]UDþHYDQMHGHO6UHGVWYD]DþLãþHQMH]UDNDYSOLQVNL
ID]L,62
Test method for assessing the performance of gas-phase air cleaning media and devices
for general ventilation - Part 1: Gas-phase air cleaning media (ISO 10121-1:2014)
Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der
Gasphase für die allgemeine Lüftung - Teil 1: Medien zur Reinigung der Gasphase (ISO
10121-1:2014)
Méthodes d'essai pour l'évaluation de la performance des médias et des dispositifs de
filtration moléculaire pour la ventilation générale - Partie 1: Médias de filtration
moléculaire (GPACM) (ISO 10121-1:2014)
Ta slovenski standard je istoveten z: EN ISO 10121-1:2014
ICS:
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
SIST EN ISO 10121-1:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 10121-1:2014

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SIST EN ISO 10121-1:2014

EUROPEAN STANDARD
EN ISO 10121-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2014
ICS 91.140.30
English Version
Test method for assessing the performance of gas-phase air
cleaning media and devices for general ventilation - Part 1: Gas-
phase air cleaning media (ISO 10121-1:2014)
Méthodes d'essai pour l'évaluation de la performance des Methode zur Leistungsermittlung von Medien und
médias et des dispositifs de filtration moléculaire pour la Vorrichtungen zur Reinigung der Gasphase für die
ventilation générale - Partie 1: Médias de filtration allgemeine Lüftung - Teil 1: Medien zur Reinigung der
moléculaire (GPACM) (ISO 10121-1:2014) Gasphase (ISO 10121-1:2014)
This European Standard was approved by CEN on 6 March 2014.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10121-1:2014 E
worldwide for CEN national Members.

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SIST EN ISO 10121-1:2014
EN ISO 10121-1:2014 (E)
Contents Page
Foreword .3
2

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SIST EN ISO 10121-1:2014
EN ISO 10121-1:2014 (E)
Foreword
This document (EN ISO 10121-1:2014) has been prepared by Technical Committee ISO/TC 142 “Cleaning
equipment for air and other gases” in collaboration with Technical Committee CEN/TC 195 “Air filters for
general air cleaning” the secretariat of which is held by UNI.
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 October 2014, and conflicting national standards shall be withdrawn at
the latest by October 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10121-1:2014 has been approved by CEN as EN ISO 10121-1:2014 without any modification.

3

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SIST EN ISO 10121-1:2014

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SIST EN ISO 10121-1:2014
INTERNATIONAL ISO
STANDARD 10121-1
First edition
2014-04-15
Test method for assessing the
performance of gas-phase air cleaning
media and devices for general
ventilation —
Part 1:
Gas-phase air cleaning media
Méthodes d’essai pour l’évaluation de la performance des médias
et des dispositifs de filtration moléculaire pour la ventilation
générale —
Partie 1: Médias de filtration moléculaire (GPACM)
Reference number
ISO 10121-1:2014(E)
©
ISO 2014

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 6
4.1 Symbols . 6
4.2 Abbreviated terms . 8
5 Testing of different GPACM configurations. 8
5.1 General . 8
5.2 Test setup and normative GPACM sample holder . 9
5.3 Raw data, sampling accuracy and normative generation parameters .11
5.4 Test parameters for the standardized benchmark test .11
5.5 Test parameters selected between user and supplier .13
6 Test sequence .14
6.1 General .14
6.2 Conditioning and pressure drop determination .14
6.3 Capacity determination .15
6.4 Retentivity determination .18
7 Validation of test setup .19
7.1 General .19
7.2 Determination of rise time and decay time .19
8 Evaluation and report .21
8.1 Test report introduction .21
8.2 Test report example .21
9 Safety features .25
Annex A (normative) Test equipment requirements, equipment validation and
routine operation .26
Annex B (informative) Challenge gases, generation sources and analysis techniques .29
Annex C (informative) Design of a media test stand .35
Annex D (normative) Normative sampling procedures and test parameters for different GPACM .36
Bibliography .40
© ISO 2014 – All rights reserved iii

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 142, Cleaning equipment for air and other gases.
ISO 10121 consists of the following parts, under the general title Test methods for assessing the
performance of gas-phase air cleaning media and devices for general ventilation:
— Part 1: Gas-phase air cleaning media (GPACM)
— Part 2: Gas-phase air cleaning devices (GPACD)
iv © ISO 2014 – All rights reserved

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

Introduction
There is an increasing use and need for gas-phase filtration in general filtration applications. This demand
can be expected to increase rapidly due to the increasing pollution problems in the world together with
an increasing awareness that solutions to the problems are available in the form of filtration devices
or phrased more technically: gas-phase air cleaning devices (GPACD). The performance of devices
using adsorption for gas removal relies to a large extent on the performance of a solid gas-phase air
cleaning media (GPACM) incorporated in the device. Still applications, device performance and media
performance are often poorly understood by the user and supplier of such media and devices. Media
tests may also be adequate to offer data for real applications if actual low concentrations (<100 ppb) and
longer exposure times (>weeks) can be used in the test, provided that the geometrical configuration,
packing density and flow conditions of the small-scale test specimen are equal to those used in the real
applications. Such tests are however not included in the scope of this part of ISO 10121. This part of
ISO 10121 attempts to increase understanding and communication by supplying a more standardized
interface between media suppliers, device suppliers and end users. At present, standards exist for
[1]
general ventilation in Japan by JIS, Automotive filters by ISO, in-duct sorptive media gas-phase air-
[2] [3] [5]
cleaning devices by ASHRAE and for adsorptive media by ASHRAE and ASTM. No international
standard for general filtration exists today.
This part of ISO 10121 provides methods, test equipment, data interpretation and reporting for three
different types of gas-phase air cleaning media (GPACM) intended for use in gas-phase air cleaning
devices (GPACD) for general ventilation applications.
In addition information is given in a number of annexes:
— Annex A describes the normative validation procedure in detail in a tabulated form.
— Annex B gives a list of possible test gases, generation sources and suggests proper analysis equipment
for common test gases
— Annex C describes the design of the test stand except the normative sample holder.
— Annex D describes the normative test setup and normative section of the test stand for the three
different media configurations.
A general introduction to molecular filtration and molecular filtration testing can be found in the
scientific literature.
The ISO 10121 series aims to provide laboratory test methods for media and devices which are used for
removal of gas-phase contaminants from air in general ventilation. It consists of two parts:
— ISO 10121-1 covers three different media configurations and is targeted towards giving a
standardized interface between media suppliers and producers of air cleaning devices. It may also
be used between media suppliers and end customers with regards to loose fill media properties.
— ISO 10121-2 aims to give a standardized interface between suppliers of air cleaning devices and end
customers seeking the best performing and most economical way to employ gas-phase filtration.
© ISO 2014 – All rights reserved v

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SIST EN ISO 10121-1:2014

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SIST EN ISO 10121-1:2014
INTERNATIONAL STANDARD ISO 10121-1:2014(E)
Test method for assessing the performance of gas-phase
air cleaning media and devices for general ventilation —
Part 1:
Gas-phase air cleaning media
1 Scope
This part of ISO 10121 aims to provide an objective laboratory test method, a suggested apparatus,
normative test sections and normative tests for evaluation of three different solid gas-phase air
cleaning media (GPACM) or GPACM configurations for use in gas-phase air cleaning devices intended
for general filtration applications. This part of ISO 10121 is specifically intended for challenge testing
and not for general material evaluation or pore system characterization. The three different types of
GPACM identified in this part of ISO 10121 are GPACM-LF (particles of different shape and size intended
for e.g. Loose Fill applications), GPACM-FL (FLat sheet fabric intended for e.g. flat one layer, pleated or
bag type devices) and GPACM-TS (three dimensional structures that are many times thicker than flat
sheet and e.g. used as finished elements in a device). The tests are conducted in an air stream and the
GPACM configurations are challenged with test gases under steady-state conditions. Since elevated gas
challenge concentrations (relative to general ventilation applications) are used, test data should be used
to compare GPACM within the same configuration and not for the purpose of predicting performance
in a real situation. It is also not implied that different GPACM configurations can be directly compared.
The primary intention is to be able to compare like GPACM configurations to like, not between GPACM
configurations. Testing of complete devices is described in ISO 10121-2.
To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is defined:
an example is illustrated in Annex C (informative). Instead normative demands for media sample holder
design, apparatus properties and validation tests are specified.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 10121-2, Test methods for assessing the performance of gas-phase air cleaning media and devices for
general ventilation — Part 2: Gas-phase air cleaning devices (GPACD)
ISO 29464, Cleaning equipment for air and other gases — Terminology
ASTM D2854, Standard Test Method for Apparent Density of Activated Carbon
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 29464 and the following apply.
3.1
absorption
transport and dissolution of a sorbate into an absorbent
© ISO 2014 – All rights reserved 1

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

3.2
adsorbate
molecular compound in gaseous or vapour phase that will be retained by the adsorbent material of the
media
3.3
adsorbent
material that collects adsorbates on its surface through physical or chemical processes
3.4
adsorption
process in which the molecules of a gas adhere by physical or chemical processes to the exposed surface
of solid substances, both the outer surface and inner pore surface, with which they come into contact
3.5
breakthrough
amount of gaseous contaminant in the effluent of a GPAC Media or Device
Note 1 to entry: See penetration (3.33).
3.6
breakthrough vs. time curve
plot of contaminant penetration versus time for a particular challenge concentration and airflow
[SOURCE: ISO 29464:2011; 3.2.67]
3.7
bypass
proportion of the challenge air stream that passes around the GPACD without contacting the filter media
[SOURCE: ISO 29464:2011; 3.2.64]
3.8
capacity
m
s
amount (mass or moles) of a selected sorbate that can be contained in the GPAC Media or Device at given
test conditions, and a specific end point
Note 1 to entry: Capacity can also be negative during desorption.
3.9
challenge concentration
concentration of the test contaminant(s) of interest in the air stream prior to filtration (challenge air
stream)
3.10
challenge compound
chemical compound that is being used as the contaminant of interest for any given test
3.11
challenge air stream
test contaminant(s) of interest diluted to the specified concentration(s) of the test prior to filtration
[SOURCE: ISO 29464:2011; 3.2.16]
3.12
channeling
disproportionate or uneven flow of gas through passages of lower resistance due to inconsistencies in
the design or production of a GPACD, particularly in packed granular beds
[SOURCE: ISO 29464:2011; 3.2.17]
2 © ISO 2014 – All rights reserved

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

3.13
chemisorption
chemical adsorption
trapping of gaseous or vapour contaminants on an adsorbent involving chemical reaction on the
adsorbent surface
[SOURCE: ISO 29464:2011; 3.2.19]
3.14
concentration
C
n
quantity of one substance dispersed in a defined amount of another
Note 1 to entry: Indices “n” denote location or origin.
[SOURCE: ISO 29464:2011; 3.2.21]
3.15
contaminant
substance (solid, liquid, or gas) that negatively affects the intended use of a fluid
[SOURCE: ISO 29464:2011; 3.2.23]
3.16
decay time
t
Dn
time required for the gas contaminant monitoring instrument to record a reduction from greater than
95 % of the challenge concentration to less than 5 % of the challenge concentration (t - t ) at the
END VC
downstream sampling point for a specific test (n), challenge gas and gas flow after stopping the injection
of the contaminant with no GPAC Media or Device present
3.17
desorption
process in which adsorbate molecules leave the surface of the adsorbent and re-enter the air stream
Note 1 to entry: Desorption is the opposite of adsorption.
3.18
downstream
area following the filter in the direction of fluid flow
3.19
efficiency vs. time curve
plot of the GPAC Media or Device removal efficiency against time over the duration of a challenge test for
a particular challenge concentration and airflow
[SOURCE: ISO 29464:2011; 3.2.31]
3.20
efficiency vs. capacity curve
plot of the GPACD removal efficiency against the integrated capacity over the duration of a challenge test
for a particular challenge concentration and airflow
[SOURCE: ISO 29464:2011; 3.2.28]
3.21
face velocity
air flow rate divided by the cross sectional area of the GPAC Media or Device
© ISO 2014 – All rights reserved 3

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

3.22
gas
substance whose vapour pressure is greater than the ambient pressure at ambient temperature
[SOURCE: ISO 29464:2011; 3.2.44]
3.23
gas-phase air cleaning device
GPACD
assembly of a fixed size enabling the removal of specific gas- or vapour-phase contaminants
Note 1 to entry: It is normally box shaped or fits into a box of dimensions between 300 mm × 300 mm × 300 mm
up to approximately 610 mm × 610 mm × 610 mm or 2 feet × 2 feet × 2 feet.
[SOURCE: ISO 29464:2011; 3.2.45, modified – NOTE has been modified.]
3.24
GPAC media or device face area
cross-sectional area of the GPAC Media or Device also including a header frame or other support
structures if so equipped when viewed from the direction of air flow using exact dimensions
3.25
gas-phase air cleaning media
GPACM
solid media or media configuration used for filtering a contaminant
EXAMPLE A porous film or fibrous layer; a bead shaped, granular or pelletized adsorbent (or chemisorbent); a
support structure of fabric, foam or monoliths containing adsorbent in the form of small sized particles, granules,
spheres or powder; a woven or nonwoven fabric completely made from an adsorbent material.
3.26
GPACM-LF
adsorbent in the form of particles of different shape and size intended for e.g. loose fill applications
3.27
GPACM-FL
adsorbent in the form of flat sheet that is flexible, thin, and nominally 2-dimensional
EXAMPLE Woven or nonwoven fabrics, wet laid papers, smooth pads, felts etc. normally handled as roll
goods.
3.28
GPACM-TS
adsorbent in the form of a three dimensional structure that is many times thicker than flat sheet and e.g.
used as a finished element in a device
EXAMPLE Flexible open cell structures, i.e. of thicker impregnated foam, corrugated pads etc. and air
permeable rigid structures, i.e. of bonded particles, honeycomb trays, extruded monoliths, etc.
3.29
initial efficiency
E
i
efficiency calculated as the intersection of vertical efficiency axis by extrapolation of a linear fit of
efficiency vs. time from the values between 2 to 12 minutes of the E vs. time graph generated during
testing of a GPAC Media or Device
3.30
molecular contamination
contamination present in gas or vapour phase in an air stream and excluding compounds in particulate
(solid) phase regardless of their chemical nature
4 © ISO 2014 – All rights reserved

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

3.31
ppb(v)
parts per billion by volume concentration measure normally used to record ambient levels of outdoor
pollution
3 3
Note 1 to entry: Units are mm /m .
3.32
ppm(v)
parts per million by volume concentration measure normally used to record pollution levels in, e.g. work
place safety
3 3 3
Note 1 to entry: Units are cm /m and ml/m .
3.33
penetration
P
ratio of contaminant concentration downstream of the filter to the upstream (challenge) concentration
Note 1 to entry: Sometimes expressed as a percentage.
Note 2 to entry: Related to efficiency (E) by the expression: E = (1 – P) × 100 %.
[SOURCE: ISO 29464:2011; 3.2.51]
3.34
physisorption
physical adsorption attraction of an adsorbate to the surface, both outer surface and inner pore surface,
of an adsorbent by physical forces (Van der Waals forces)
3.35
pores
minute passageways through which fluid may pass or that expose to the fluid stream the internal
surfaces of an adsorbent media
[SOURCE: ISO 29464:2011; 3.2.55]
3.36
pressure drop
Δp
difference in pressure between two points in an airflow system at specified conditions, especially when
measured across a GPAC Media or Device
3.37
removal efficiency
E
fraction or percentage of a challenge contaminant that is retained by a GPAC Media or Device at a given
time
3.38
retentivity
m
r
measure of the ability of an adsorbent or GPACD to resist desorption of an adsorbate
Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean,
conditioned air only, following challenge breakthrough.
[SOURCE: ISO 29464:2011; 3.2.61, modified – NOTE has been added]
© ISO 2014 – All rights reserved 5

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SIST EN ISO 10121-1:2014
ISO 10121-1:2014(E)

3.39
residence time
t
r
relative time that an increment of fluid (or contaminant) is within the boundaries of the media volume
EXAMPLE An example of the media volume is a bed of granules or a non-woven sheet.
Note 1 to entry: In typical use and in this part of ISO 10121, this value neglects the fact that the media and possible
support structures occupy a significant portion of the volume of the bed [ tR = V (total bed
...