ISO 22241-1:2006

Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements

ISO 22241-1:2006 specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea solution) which is needed to operate converters with selective catalytic reduction, so-called SCR (Selective Catalytic Reduction) converters, in motor vehicles with diesel engines. SCR converters are particularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines.

Moteurs diesel — Agent AUS 32 de réduction des NOx — Partie 1: Exigences de qualité

General Information

• Status: Withdrawn
• Publication Date: 10-Oct-2006
• Withdrawal Date: 10-Oct-2006
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
• Drafting Committee: ISO/TC 22/SC 34/WG 14 - NOx reduction additive
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 12-Feb-2019

Relations

• Revised: ISO 22241-1:2019 - Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements
• Effective Date: 19-Apr-2014
• Revises: ISO/PAS 22241-1:2005 - Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22241-1
First edition
2006-10-15

Diesel engines — NOx reduction agent
AUS 32 —
Part 1:
Quality requirements
Moteurs diesel — Agent AUS 32 de réduction des NOx —
Partie 1: Exigences de qualité




Reference number
ISO 22241-1:2006(E)
©
ISO 2006

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ISO 22241-1:2006(E)
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ISO 22241-1:2006(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 22241-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 5, Engine
tests.
This first edition cancels and replaces ISO/PAS 22241-1:2005, which has been technically revised.
ISO 22241 consists of the following parts, under the general title Diesel engines — NOx reduction agent
AUS 32:
⎯ Part 1: Quality requirements
⎯ Part 2: Test methods
The following parts are under preparation:
⎯ Part 3: Packaging, transportation and storage
⎯ Part 4: Refilling interface
Annexes A, B and C are for information only.
© ISO 2006 – All rights reserved iii

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ISO 22241-1:2006(E)
Introduction
In order to protect the environment, keeping the air quality as clean as possible, exhaust emissions
regulations around the world have been strengthened considerably. In motor vehicles with diesel engines,
particulate matters (PM) and nitrogen oxide (NOx) emissions are the main concern, and efforts have been
focused on the development of technology which can reduce them effectively with minimum fuel economy
penalty. Selective catalytic reduction (SCR) converters using urea solution as the reduction agent is
considered to be a key technology for reducing NOx emissions. The quality of the urea solution used for that
technology needs to be specified to ensure reliable and stable operation of the SCR converter systems. The
ISO 22241 series provides the specifications for quality characteristics, for handling, transportation and
storage and for the refilling interface as well as the test methods, needed by the manufacturers of motor
vehicles and their engines, by converter manufacturers, by producers and distributors of the urea solution and
by fleet operators.
The urea solution as specified in this part of ISO 22241 is commercially available, e.g. under the registered

®
trademark AdBlue . ISO takes no position concerning the evidence, validity and scope of this trademark right.

®
Licensees of the trademark AdBlue have committed themselves to comply with the requirements of this part
of ISO 22241.
The holder of this trademark right has assured ISO that he is willing to negotiate licenses under reasonable
and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the
statement of the holder of this trademark right is registered with ISO. Information may be obtained from:
VDA - Verband der Automobilindustrie e.V.
60325 Frankfurt/M
Germany
This information is given for the convenience of the users of this International Standard and does not
constitute an endorsement of the trademark.

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INTERNATIONAL STANDARD ISO 22241-1:2006(E)

Diesel engines — NOx reduction agent AUS 32 —
Part 1:
Quality requirements
1 Scope
This part of ISO 22241 specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea
solution) which is needed to operate converters with selective catalytic reduction, so-called SCR (selective
catalytic reduction) converters, in motor vehicles with diesel engines. SCR converters are particularly suitable
for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines.
In the remaining parts of ISO 22241, the term “NOx reduction agent AUS 32” will be abbreviated to “AUS 32”.
2 Normative references
The following referenced documents are indispensable for the application 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 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydrometer method
ISO 4259, Petroleum products — Determination and application of precision data in relation to methods of test
ISO 12185, Crude petroleum and petroleum products — Determination of density — Oscillating U-tube
method
ISO 22241-2, Diesel engines — NOx reduction agent AUS 32 — Part 2: Test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
NOx reduction agent AUS 32
aqueous urea solution, manufactured from technically pure urea – with no addition (see NOTE) of any other
substances – and pure water, having a urea content of 32,5 % and with the quality characteristics defined in
Clause 5
NOTE With the possible exception of a tracer in accordance with the requirement in Table 1.
3.2
technically pure urea
industrially produced gra
...