ISO 8573-5:2025
(Main)Compressed air — Contaminant measurement — Part 5: Oil vapour content
Compressed air — Contaminant measurement — Part 5: Oil vapour content
This document specifies the test method for determining the content of oil vapour in compressed air using pressurized sampling and gas chromatography. This document elaborates sampling, measurement, evaluation, uncertainty considerations and reporting in respect of the compressed air purity class for oil, in accordance with ISO 8573-1. For organic vapours and other gaseous contaminants, the same sampling procedure can be used, however the analysis method will be different depending on the target component. As guidance, ISO 8573-6 and ISO 16000-6 can be used.
Air comprimé — Mesurage des polluants — Partie 5: Teneur en vapeurs d'huile
L'ISO 8573-5:2001 spécifie la méthode d'essai par chromatographie en phase gazeuse pour la détermination de la teneur en vapeurs d'huile (hydrocarbures composés de six atomes de carbone ou plus) dans l'air comprimé, indépendamment de l'origine de l'air comprimé, tout comme de la présence de tout solvant organique dans la vapeur, difficile à séparer des autres hydrocarbures. Elle donne également des indications sur la procédure de mise en oeuvre de tubes indicateurs chimiques lors d'une première évaluation de présence de vapeurs d'huile. L'ISO 8573-5:2001 fournit des considérations sur l'échantillonnage, le mesurage, l'évaluation, les incertitudes de mesure et la présentation du rapport d'essai en ce qui concerne le paramètre «vapeurs d'huile» de la classe de pureté de l'air comprimé, conformément à l'ISO 8573-1. NOTE Les hydrocarbures plus légers composés de 5 carbones ou moins sont traités comme des polluants gazeux dans l'ISO 8573-6.
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International
Standard
ISO 8573-5
Second edition
Compressed air — Contaminant
2025-07
measurement —
Part 5:
Oil vapour content
Air comprimé — Mesurage des polluants —
Partie 5: Teneur en vapeurs d'huile
Reference number
© ISO 2025
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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units. 1
5 Reference conditions . 2
6 Test methods . 2
6.1 Indicative methods .2
6.2 Quantitative analysis using gas chromatography .2
7 Materials for sampling . 2
7.1 Sampling system .2
7.2 Sorbent tube . .4
7.2.1 Principle .4
7.2.2 Laboratory blank .4
7.2.3 Field blank .4
8 Materials and apparatus for gas chromatographic analysis . 4
8.1 Gas chromatograph .4
8.2 Thermal desorption apparatus .5
8.3 Calibration standards .5
8.3.1 General .5
8.3.2 Dilution solvent .5
8.3.3 Calibration substance .5
9 Sampling . 5
9.1 General .5
9.2 Sampling volume .5
9.3 Procedure .6
9.3.1 General .6
9.3.2 Storage of loaded samples and field blanks .6
9.3.3 Uncertainty and repeatability .6
10 Sample analysis . 7
11 Calculation of test results . 7
12 Test report . 7
13 Quality control . 8
Annex A (informative) Example test report of an oil vapour content measurement in
compressed air. 9
Annex B (informative) Indicative test methods .11
Bibliography .12
iii
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)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 Technical Committee ISO/TC 118, Compressors and
pneumatic tools, machines and equipment, Subcommittee SC4, Compressed air treatment technology.
This second edition cancels and replaces the first edition (ISO 8573-5:2001), which has been technically
revised.
The main changes are as follows:
— a thermal desorption technique has been introduced to prevent the use of environmentally hazardous
solvents;
— a re-useable standardized adsorption agent has been introduced.
A list of all parts of the ISO 8573 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
Introduction
Oil vapour is a common contaminant in compressed air and this document details the correct sampling
methodology and assists the user in selecting equipment and instrumentation and the determination of the
oil vapour concentration in compressed air.
Oil vapour is the sum of all gaseous hydrocarbons or organic compounds starting from n-hexane, consisting
of the subgroups:
— VOC’s: Volatile Organic Compounds C (n-hexane C H ) to C (n-hexadecane C H )
6 6 14 16 16 34
— SVOC’s: Semi Volatile Organic Compounds C (> n-hexadecane C H ) to C (n-docosane C H )
16 16 34 22 22 46
In addition, it is intended to be used to assess compressed air purity such that the purity class can be stated
in accordance with ISO 8573-1 for a total oil content of class 0, 1, 2, 3, 4, and X, and can be used only by
agreement between consenting parties when measurements to purity class 0 are to be performed.
As stated in ISO 8573-1:2010, 5.4: "Measurements for liquid oil and aerosols of oil shall be made in accordance
with ISO 8573-2. It is considered that, for classes 3, 4 and X, the oil vapour content is not expected to significantly
affect the total concentration; therefore, the measurement of vapour is optional. Where it is deemed necessary to
measure the oil vapour, then ISO 8573-5 shall be used."
v
International Standard ISO 8573-5:2025(en)
Compressed air — Contaminant measurement —
Part 5:
Oil vapour content
1 Scope
This document specifies the test method for determining the content of oil vapour in compressed air using
pressurized sampling and gas chromatography.
This document elaborates sampling, measurement, evaluation, uncertainty considerations and reporting in
respect of the compressed air purity class for oil, in accordance with ISO 8573-1.
For organic vapours and other gaseous contaminants, the same sampling procedure can be used, however
the analysis method will be different depending on the target component. As guidance, ISO 8573-6 and
ISO 16000-6 can be used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3857-4, Compressors, pneumatic tools and machines — Vocabulary — Part 4: Air treatment
ISO 8573-1, Compressed air — Part 1: Contaminants and purity classes
ISO 16000-6:2021, Indoor air — Part 6: Determination of organic compounds (VVOC, VOC, SVOC) in indoor and test
chamber ai
...
International
Standard
ISO 8573-5
Second edition
Compressed air — Contaminant
measurement —
Part 5:
Oil vapour content
Air comprimé — Mesurage des polluants —
Partie 5: Teneur en vapeurs d'huile
PROOF/ÉPREUVE
Reference number
© ISO 2025
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
PROOF/ÉPREUVE
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units. 1
5 Reference conditions . 2
6 Test methods . 2
6.1 Indicative methods .2
6.2 Quantitative analysis using gas chromatography .2
7 Materials for sampling . 2
7.1 Sampling system .2
7.2 Sorbent tube . .4
7.2.1 Principle .4
7.2.2 Laboratory blank .4
7.2.3 Field blank .4
8 Materials and apparatus for gas chromatographic analysis . 5
8.1 Gas chromatograph .5
8.2 Thermal desorption apparatus .5
8.3 Calibration standards .5
8.3.1 General .5
8.3.2 Dilution solvent .5
8.3.3 Calibration substance .5
9 Sampling . 5
9.1 General .5
9.2 Sampling volume .6
9.3 Procedure .6
9.3.1 General .6
9.3.2 Storage of loaded samples and field blanks .6
9.3.3 Uncertainty and repeatability .7
10 Sample analysis . 7
11 Calculation of test results . 7
12 Test report . 7
13 Quality control . 8
Annex A (informative) Example test report of an oil vapour content measurement in
compressed air. 9
Annex B (informative) Indicative test methods .11
Bibliography .12
PROOF/ÉPREUVE
iii
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)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 Technical Committee ISO/TC 118, Compressors and
pneumatic tools, machines and equipment, Subcommittee SC4, Compressed air treatment technology.
This second edition cancels and replaces the first edition (ISO 8573-5:2001), which has been technically
revised.
The main changes are as follows:
— a thermal desorption technique has been introduced to prevent the use of environmentally hazardous
solvents;
— a re-useable standardized adsorption agent has been introduced.
A list of all parts of the ISO 8573 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.
PROOF/ÉPREUVE
iv
Introduction
Oil vapour is a common contaminant in compressed air and this document details the correct sampling
methodology and assists the user in selecting equipment and instrumentation and the determination of the
oil vapour concentration in compressed air.
Oil vapour is the sum of all gaseous hydrocarbons or organic compounds starting from n-hexane, consisting
of the subgroups:
— VOC’s: Volatile Organic Compounds C (n-hexane C H ) to C (n-hexadecane C H )
6 6 14 16 16 34
— SVOC’s: Semi Volatile Organic Compounds C (> n-hexadecane C H ) to C (n-docosane C H )
16 16 34 22 22 46
In addition, it is intended to be used to assess compressed air purity such that the purity class can be stated
in accordance with ISO 8573-1 for a total oil content of class 0, 1, 2, 3, 4, and X, and can be used only by
agreement between consenting parties when measurements to purity class 0 are to be performed.
As stated in ISO 8573-1:2010, 5.4: "Measurements for liquid oil and aerosols of oil shall be made in accordance
with ISO 8573-2. It is considered that, for classes 3, 4 and X, the oil vapour content is not expected to significantly
affect the total concentration; therefore, the measurement of vapour is optional. Where it is deemed necessary to
measure the oil vapour, then ISO 8573-5 shall be used."
PROOF/ÉPREUVE
v
International Standard ISO 8573-5:2025(en)
Compressed air — Contaminant measurement —
Part 5:
Oil vapour content
1 Scope
This document specifies the test method for determining the content of oil vapour in compressed air using
pressurized sampling and gas chromatography.
This document elaborates sampling, measurement, evaluation, uncertainty considerations and reporting in
respect of the compressed air purity class for oil, in accordance with ISO 8573-1.
For organic vapours and other gaseous contaminants, the same sampling procedure can be used, however
the analysis method will be different depending on the target component. As guidance, ISO 8573-6 and
ISO 16000-6 can be used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3857-4, Compressors, pneumatic tools and machines — Vocabulary — Part 4: Air treatment
ISO 8573-1, Compressed air — Part 1: Contaminants and purity classes
ISO 16000-6:2021, Indoor air — Part 6: Determination of organic comp
...
ISO /PRF 8573-5:2025(E)
ISO /TC 118/SC 04/WG 1 4
Secretariat: BSI
Date: 2025-01-2105-16
Compressed air — Contaminant measurement — —
Part 5:
Oil vapour content
FDIS stage
Warning for WDs and CDs
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change
without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
ISO #####-#:####(X)
Air comprimé — Mesurage des polluants —
Partie 5: Teneur en vapeurs d'huile
PROOF
2 © ISO #### – All rights reserved
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
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
Contents
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units . 1
5 Reference conditions . 2
6 Test methods . 2
7 Materials for sampling . 2
8 Materials and apparatus for gas chromatographic analysis . 5
9 Sampling . 6
10 Sample analysis . 8
11 Calculation of test results . 8
12 Test report . 8
13 Quality control . 9
Annex A (informative) Example test report of an oil vapour content measurement in
compressed air .10
Annex B (informative) Indicative test methods .12
Bibliography .14
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units . 2
5 Reference conditions . 2
6 Test methods . 2
6.1 Indicative methods . 2
6.2 Quantitative analysis using gas chromatography . 2
7 Materials for sampling . 3
7.1 Sampling system . 3
Key 3
7.2 Sorbent tube . 4
7.2.1 Principle . 4
7.2.2 Laboratory blank . 5
7.2.3 Field blank . 5
8 Materials and apparatus for gas chromatographic analysis . 5
8.1 Gas chromatograph . 5
iv © ISO 2025 All rights reserved
8.2 Thermal desorption apparatus . 5
8.3 Calibration standards . 5
8.3.1 General . 5
8.3.2 Dilution solvent . 5
8.3.3 Calibration substance . 5
9 Sampling . 5
9.1 General . 5
9.2 Sampling volume . 6
9.3 Procedure . 6
9.3.1 General . 6
9.3.2 Storage of loaded samples and field blanks . 7
9.3.3 Uncertainty and repeatability . 7
10 Sample analysis . 7
11 Calculation of test results . 7
12 Test report . 8
13 Quality control . 8
Annex A (informative) Example test report of an oil vapour content measurement in
compressed air . 9
A.1 General data . 9
A.2 Test data . 9
A.3 Sampling . 9
A.4 Analysis . 10
Annex B (informative) Indicative test methods . 11
B.1 Chemical indicator tubes . 11
B.2 Real-time non-selective sensing systems . 11
Bibliography . 12
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 documentsdocument 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 drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse 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) patent(s) which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest information,
which may be obtained from the patent database available at www.iso.org/patents. 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 Technical Committee ISO/TC 118, Compressors and
pneumatic tools, machines and equipment, Subcommittee SC4, Compressed air treatment technology.
This second edition cancels and replaces the first edition (ISO 8573-5:2001), which has been technically
revised.
The main changes are as follows:
— — The introduction of a thermal desorption technique has been introduced to prevent the use of
environmentally hazardous solvents.;
— — The introduction of a re-useable standardized adsorption agent has been introduced.
A list of all parts of the ISO 8573 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.
vi © ISO 2025 All rights reserved
Introduction
Oil vapour is a common contaminant in compressed air and this document details the correct sampling
methodology and assists the user i
...
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