Interior air of road vehicles - Part 10: Whole vehicle test chamber - Specification and methods for the determination of volatile organic compounds in cabin interiors - Trucks and buses

This document describes and specifies the whole vehicle test chamber, the vapour sampling assembly and the operating conditions for the determination of volatile organic compounds (VOCs; for more information see Annex E), and carbonyl compounds in vehicle cabin air. There are three measurements performed: one (for VOCs and carbonyl compounds) during the simulation of ambient conditions (ambient mode) at standard conditions of 23 °C with no air exchange; a second only for the measurement of formaldehyde at elevated temperatures (parking mode); and a third for VOCs and carbonyl compounds simulating driving after the vehicle has been parked in the sun starting at elevated temperatures (driving mode). For the simulation of the mean sun irradiation, fixed irradiation in the whole vehicle test chamber is employed.
The VOC method is valid for measurement of non-polar and slightly polar VOCs in a concentration range of sub-micrograms per cubic metre up to several milligrams per cubic metre. Using the principles described in this method, some semi-volatile organic compounds (SVOC) can also be analysed. Compatible compounds are those which can be trapped and released from the Tenax TA®1) sorbent tubes described in ISO 16000‑6, which includes VOCs ranging in volatility from n-C6 to n-C16.
The sampling and analysis procedure for formaldehyde and other carbonyl compounds is performed by collecting air on to cartridges coated with 2,4-dinitrophenylhydrazine (DNPH) and subsequent analysis by high performance liquid chromatography (HPLC) with detection by ultraviolet absorption. Formaldehyde and other carbonyl compounds can be determined in the approximate concentration range 1 μg/m3 to 1 mg/m3.
This method applicable to trucks and buses, as defined in ISO 3833:1977 3.1.1 to 3.1.6.
This document describes:
a) Transport and storage of the test vehicle until the start of the test.
b) Conditioning of the surroundings of the test vehicle and the test vehicle itself as well as the whole vehicle test chamber.
c) Conditioning of the test vehicle prior to measurements.
d) Simulation of ambient air conditions (ambient mode).
e) Formaldehyde sampling at elevated temperatures (parking mode).
f) Simulation of driving after the test vehicle has been parked in the sun (driving mode).
1)Tenax TA® is the trade name of a product supplied by Buchem. This information is given for the convenience of users of this document and does not constitute an endorsement by ISO of the product named. Equivalent products may be used if they can be shown to lead to the same results.

Air intérieur des véhicules routiers — Partie 10: Titre manque

Notranji zrak v cestnih vozilih - 10. del: Preskusna komora za celotno vozilo - Specifikacija in metode za določevanje hlapnih organskih spojin v notranjosti kabine - Tovornjaki in avtobusi

General Information

Status
Published
Public Enquiry End Date
01-Mar-2021
Publication Date
16-Aug-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Jun-2021
Due Date
03-Sep-2021
Completion Date
17-Aug-2021

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SLOVENSKI STANDARD
01-september-2021
Notranji zrak v cestnih vozilih - 10. del: Preskusna komora za celotno vozilo -
Specifikacija in metode za določevanje hlapnih organskih spojin v notranjosti
kabine - Tovornjaki in avtobusi
Interior air of road vehicles - Part 10: Whole vehicle test chamber - Specification and
methods for the determination of volatile organic compounds in cabin interiors - Trucks
and buses
Ta slovenski standard je istoveten z: ISO 12219-10:2021
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
43.020 Cestna vozila na splošno Road vehicles in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 12219-10
First edition
2021-06
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber —
Specification and methods for the
determination of volatile organic
compounds in cabin interiors —
Trucks and buses
Reference number
©
ISO 2021
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Apparatus and materials. 3
4.1 General . 3
4.2 Heating radiator . 3
4.3 Sampling trains . 3
4.3.1 Sampling in the test vehicle . 3
4.3.2 Sampling in the whole vehicle test chamber . 4
4.3.3 Sampling line . 4
4.4 Analytical equipment and materials . 4
4.5 Test vehicle . 4
5 Principle . 5
6 Requirements of the whole vehicle test chamber, test vehicle and measurement
procedures . 5
6.1 Requirements for the whole vehicle test chamber . 5
6.2 Requirements for the test vehicle . 6
6.3 Requirements for VOC and carbonyl compound air sampling and measurement methods 7
6.4 Field blank measurement . 8
7 Standard test procedure . 9
7.1 General . 9
7.2 Pre-arrangements and preconditioning of the whole vehicle test chamber and the
vehicle performing field blanks . 9
7.2.1 Pre-arrangements . 9
7.2.2 Preconditioning of the whole vehicle test chamber . 9
7.2.3 Preconditioning of the test vehicle . 9
7.2.4 Field blanks . 9
7.3 Detailed description of the test procedure .10
7.3.1 Ambient mode .10
7.3.2 Parking mode .11
7.3.3 Driving mode .11
8 Calculation, presentation of results, and precision and uncertainty .12
9 Performance characteristics .12
10 Quality assurance .12
Annex A (informative) Whole vehicle test chamber and the ambient mode chamber condition .13
Annex B (informative) VOC concentration distribution in the bus cabin .14
Annex C (informative) Temperature measuring points for parking mode .15
Annex D (informative) Test report .16
Annex E (informative) Very volatile organic compounds, volatile organic compounds and
semi-volatile organic compounds .18
Bibliography .19
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 146, Air quality, Subcommittee SC 6,
Indoor air.
A list of all parts in the ISO 12219 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 © ISO 2021 – All rights reserved

Introduction
Volatile organic compounds (VOCs) are widely used in industry and can be emitted by many every-day
products and materials. They have attracted much attention in recent years because of their impact
on cabin air quality. After homes and workplaces, people spend a lot of time in their vehicles. It is
important to determine the material emissions of interior parts and to reduce them to an acceptable
level. Therefore, it is important to get comprehensive and reliable information about the types of
organic compounds in the interior air of vehicles and also their concentrations.
This document outlines a method of measuring the types and levels of VOCs in vehicle cabin air under
controlled conditions. It describes requirements for a whole vehicle test chamber and a test protocol.
INTERNATIONAL STANDARD ISO 12219-10:2021(E)
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber — Specification and methods
for the determination of volatile organic compounds in
cabin interiors — Trucks and buses
1 Scope
This document describes and specifies the whole vehicle test chamber, the vapour sampling
assembly and the operating conditions for the determination of volatile organic compounds (VOCs;
for more information see Annex E), and carbonyl compounds in vehicle cabin air. There are three
measurements performed: one (for VOCs and carbonyl compounds) during the simulation of ambient
conditions (ambient mode) at standard conditions of 23 °C with no air exchange; a second only for
the measurement of formaldehyde at elevated temperatures (parking mode); and a third for VOCs
and carbonyl compounds simulating driving after the vehicle has been parked in the sun starting at
elevated temperatures (driving mode). For the simulation of the mean sun irradiation, fixed irradiation
in the whole vehicle test chamber is employed.
The VOC method is valid for measurement of non-polar and slightly polar VOCs in a concentration range
of sub-micrograms per cubic metre up to several milligrams per cubic metre. Using the principles
described in this method, some semi-volatile organic compounds (SVOC) can also be analysed.
®1)
Compatible compounds are those which can be trapped and released from the Tenax TA sorbent
tubes described in ISO 16000-6, which includes VOCs ranging in volatility from n-C6 to n-C16.
The sampling and analysis procedure for formaldehyde and other carbonyl compounds is performed
by collecti
...


INTERNATIONAL ISO
STANDARD 12219-10
First edition
2021-06
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber —
Specification and methods for the
determination of volatile organic
compounds in cabin interiors —
Trucks and buses
Reference number
©
ISO 2021
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Apparatus and materials. 3
4.1 General . 3
4.2 Heating radiator . 3
4.3 Sampling trains . 3
4.3.1 Sampling in the test vehicle . 3
4.3.2 Sampling in the whole vehicle test chamber . 4
4.3.3 Sampling line . 4
4.4 Analytical equipment and materials . 4
4.5 Test vehicle . 4
5 Principle . 5
6 Requirements of the whole vehicle test chamber, test vehicle and measurement
procedures . 5
6.1 Requirements for the whole vehicle test chamber . 5
6.2 Requirements for the test vehicle . 6
6.3 Requirements for VOC and carbonyl compound air sampling and measurement methods 7
6.4 Field blank measurement . 8
7 Standard test procedure . 9
7.1 General . 9
7.2 Pre-arrangements and preconditioning of the whole vehicle test chamber and the
vehicle performing field blanks . 9
7.2.1 Pre-arrangements . 9
7.2.2 Preconditioning of the whole vehicle test chamber . 9
7.2.3 Preconditioning of the test vehicle . 9
7.2.4 Field blanks . 9
7.3 Detailed description of the test procedure .10
7.3.1 Ambient mode .10
7.3.2 Parking mode .11
7.3.3 Driving mode .11
8 Calculation, presentation of results, and precision and uncertainty .12
9 Performance characteristics .12
10 Quality assurance .12
Annex A (informative) Whole vehicle test chamber and the ambient mode chamber condition .13
Annex B (informative) VOC concentration distribution in the bus cabin .14
Annex C (informative) Temperature measuring points for parking mode .15
Annex D (informative) Test report .16
Annex E (informative) Very volatile organic compounds, volatile organic compounds and
semi-volatile organic compounds .18
Bibliography .19
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 146, Air quality, Subcommittee SC 6,
Indoor air.
A list of all parts in the ISO 12219 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 © ISO 2021 – All rights reserved

Introduction
Volatile organic compounds (VOCs) are widely used in industry and can be emitted by many every-day
products and materials. They have attracted much attention in recent years because of their impact
on cabin air quality. After homes and workplaces, people spend a lot of time in their vehicles. It is
important to determine the material emissions of interior parts and to reduce them to an acceptable
level. Therefore, it is important to get comprehensive and reliable information about the types of
organic compounds in the interior air of vehicles and also their concentrations.
This document outlines a method of measuring the types and levels of VOCs in vehicle cabin air under
controlled conditions. It describes requirements for a whole vehicle test chamber and a test protocol.
INTERNATIONAL STANDARD ISO 12219-10:2021(E)
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber — Specification and methods
for the determination of volatile organic compounds in
cabin interiors — Trucks and buses
1 Scope
This document describes and specifies the whole vehicle test chamber, the vapour sampling
assembly and the operating conditions for the determination of volatile organic compounds (VOCs;
for more information see Annex E), and carbonyl compounds in vehicle cabin air. There are three
measurements performed: one (for VOCs and carbonyl compounds) during the simulation of ambient
conditions (ambient mode) at standard conditions of 23 °C with no air exchange; a second only for
the measurement of formaldehyde at elevated temperatures (parking mode); and a third for VOCs
and carbonyl compounds simulating driving after the vehicle has been parked in the sun starting at
elevated temperatures (driving mode). For the simulation of the mean sun irradiation, fixed irradiation
in the whole vehicle test chamber is employed.
The VOC method is valid for measurement of non-polar and slightly polar VOCs in a concentration range
of sub-micrograms per cubic metre up to several milligrams per cubic metre. Using the principles
described in this method, some semi-volatile organic compounds (SVOC) can also be analysed.
®1)
Compatible compounds are those which can be trapped and released from the Tenax TA sorbent
tubes described in ISO 16000-6, which includes VOCs ranging in volatility from n-C6 to n-C16.
The sampling and analysis procedure for formaldehyde and other carbonyl compounds is performed
by collecting air on to cartridges coated with 2,4-dinitrophenylhydrazine (DNPH) and subsequent
analysis by high performance liquid chromatography (HPLC) with detection by ultraviolet absorption.
Formaldehyde and other carbonyl compounds can be determined in the approximate concentration
3 3
range 1 μg/m to 1 mg/m .
This method applicable to trucks and buses, as defined in ISO 3833:1977 3.1.1 to 3.1.6.
This document describes:
a) Transport and storage of the test vehicle until the start of the test.
b) Conditioning of the surroundings of the test vehicle and the test vehicle itself as well as the whole
vehicle test chamber.
c) Conditioning of the test vehicle prior to measurements.
d) Simulation of ambient air conditions (ambient mode).
e) Formaldehyde sampling at elevated temperatures (parking mode).
f) Simulation of driving after the test vehicle has been parked in the sun (driving mode). ®
1) Tenax TA is the trade name of a product supplied by Buchem. This information is given for the convenience of
users of this document and does not constitute an endorsement by ISO of the product named. Equ
...


INTERNATIONAL ISO
STANDARD 12219-10
First edition
2021-06
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber —
Specification and methods for the
determination of volatile organic
compounds in cabin interiors —
Trucks and buses
Reference number
©
ISO 2021
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Apparatus and materials. 3
4.1 General . 3
4.2 Heating radiator . 3
4.3 Sampling trains . 3
4.3.1 Sampling in the test vehicle . 3
4.3.2 Sampling in the whole vehicle test chamber . 4
4.3.3 Sampling line . 4
4.4 Analytical equipment and materials . 4
4.5 Test vehicle . 4
5 Principle . 5
6 Requirements of the whole vehicle test chamber, test vehicle and measurement
procedures . 5
6.1 Requirements for the whole vehicle test chamber . 5
6.2 Requirements for the test vehicle . 6
6.3 Requirements for VOC and carbonyl compound air sampling and measurement methods 7
6.4 Field blank measurement . 8
7 Standard test procedure . 9
7.1 General . 9
7.2 Pre-arrangements and preconditioning of the whole vehicle test chamber and the
vehicle performing field blanks . 9
7.2.1 Pre-arrangements . 9
7.2.2 Preconditioning of the whole vehicle test chamber . 9
7.2.3 Preconditioning of the test vehicle . 9
7.2.4 Field blanks . 9
7.3 Detailed description of the test procedure .10
7.3.1 Ambient mode .10
7.3.2 Parking mode .11
7.3.3 Driving mode .11
8 Calculation, presentation of results, and precision and uncertainty .12
9 Performance characteristics .12
10 Quality assurance .12
Annex A (informative) Whole vehicle test chamber and the ambient mode chamber condition .13
Annex B (informative) VOC concentration distribution in the bus cabin .14
Annex C (informative) Temperature measuring points for parking mode .15
Annex D (informative) Test report .16
Annex E (informative) Very volatile organic compounds, volatile organic compounds and
semi-volatile organic compounds .18
Bibliography .19
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 146, Air quality, Subcommittee SC 6,
Indoor air.
A list of all parts in the ISO 12219 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 © ISO 2021 – All rights reserved

Introduction
Volatile organic compounds (VOCs) are widely used in industry and can be emitted by many every-day
products and materials. They have attracted much attention in recent years because of their impact
on cabin air quality. After homes and workplaces, people spend a lot of time in their vehicles. It is
important to determine the material emissions of interior parts and to reduce them to an acceptable
level. Therefore, it is important to get comprehensive and reliable information about the types of
organic compounds in the interior air of vehicles and also their concentrations.
This document outlines a method of measuring the types and levels of VOCs in vehicle cabin air under
controlled conditions. It describes requirements for a whole vehicle test chamber and a test protocol.
INTERNATIONAL STANDARD ISO 12219-10:2021(E)
Interior air of road vehicles —
Part 10:
Whole vehicle test chamber — Specification and methods
for the determination of volatile organic compounds in
cabin interiors — Trucks and buses
1 Scope
This document describes and specifies the whole vehicle test chamber, the vapour sampling
assembly and the operating conditions for the determination of volatile organic compounds (VOCs;
for more information see Annex E), and carbonyl compounds in vehicle cabin air. There are three
measurements performed: one (for VOCs and carbonyl compounds) during the simulation of ambient
conditions (ambient mode) at standard conditions of 23 °C with no air exchange; a second only for
the measurement of formaldehyde at elevated temperatures (parking mode); and a third for VOCs
and carbonyl compounds simulating driving after the vehicle has been parked in the sun starting at
elevated temperatures (driving mode). For the simulation of the mean sun irradiation, fixed irradiation
in the whole vehicle test chamber is employed.
The VOC method is valid for measurement of non-polar and slightly polar VOCs in a concentration range
of sub-micrograms per cubic metre up to several milligrams per cubic metre. Using the principles
described in this method, some semi-volatile organic compounds (SVOC) can also be analysed.
®1)
Compatible compounds are those which can be trapped and released from the Tenax TA sorbent
tubes described in ISO 16000-6, which includes VOCs ranging in volatility from n-C6 to n-C16.
The sampling and analysis procedure for formaldehyde and other carbonyl compounds is performed
by collecting air on to cartridges coated with 2,4-dinitrophenylhydrazine (DNPH) and subsequent
analysis by high performance liquid chromatography (HPLC) with detection by ultraviolet absorption.
Formaldehyde and other carbonyl compounds can be determined in the approximate concentration
3 3
range 1 μg/m to 1 mg/m .
This method applicable to trucks and buses, as defined in ISO 3833:1977 3.1.1 to 3.1.6.
This document describes:
a) Transport and storage of the test vehicle until the start of the test.
b) Conditioning of the surroundings of the test vehicle and the test vehicle itself as well as the whole
vehicle test chamber.
c) Conditioning of the test vehicle prior to measurements.
d) Simulation of ambient air conditions (ambient mode).
e) Formaldehyde sampling at elevated temperatures (parking mode).
f) Simulation of driving after the test vehicle has been parked in the sun (driving mode). ®
1) Tenax TA is the trade name of a product supplied by Buchem. This information is given for the convenience of
users of this document and does not constitute an endorsement by ISO of the product named. Equ
...

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