DD ISO PAS 22241-1:2005 pdf download Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements
Scope
This Publicly Available Specification specifies the quality characteristics of the NOx reduction agent AUS 32aqueous urea solution) which is needed to operate converters with selective catalytic reduction, so-calledSCR (Selective Catalvtic Reduction) converters, in motor vehicles with diesel engines. SCR converters areparticularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines.in the remaining parts of this Publicly Available Specification, the term “NOx reduction agent AUS 32” wil beabbreviated to“AUS 32”.
Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
ISO 22241-2, Diesel engines – NOx reduction agent AUS 32 – Pat 2: Test methodsISO 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 testISO 12185, Crude petroleum and petroleum products – Determination of density – Oscilating U-tubemethod
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1NOx reduction agent AUS 32aqueous urea solution, manufactured from technically pure urea (with no addition of any other substances)and pure water, having a urea content of 32,5 % and with the quality characteristics defined in Clause 5
3.2technically pure ureaindustrially produced grade of urea with traces of biuret, ammonia and water only, free of aldehydes or othersubstances such as anticaking agent, and free of contaminants such as sulphur and its compounds, chloride,nitrate or other compounds
NOTEFor the contaminants mentioned above, which are not a result of the urea production process, limit values andanalytical methods are not considered, as this definiton excludes urea grades usualy used in aqriculture, which mighicontain such chemical compounds.
3.3
pure water
grade of water, produced for example by single distilation, by de-ionization, by ultra-filtration or by reverse
osmosis
NOTEBased on definition of water grade 3 of ISO 3696
Designation
AUS 32 in compliance with the requirements of this Publicly Available Specification shall be designated withthe code AUS 32 and the reference number of this Publicly Available Specification:
AUS 32ISO 22241-1
Requirements and testing
The quality characteristics of the AUS 32 are specified in Table 1. They shall be continuously monitored by themanufacturer following a valid testing plan.
Compliance with the limits specified in Table 1 shall be verified with the test methods indicated
NOTE 1
NOTE 2
See Annex A with respect to the chemical characteristics of urea and the physical properties of AUS 32.
See Annex B with respect to precision of the test methods.
6Packaging, transportation and storage
Recommendations for the logistics chain from the factory to the vehicle, in order to maintain the high quality ofthe product, are given in Annex C
Marking
Distribution pumps and containers for the distribution of AUS 32 in compliance with the requirements of thisPublicly Available Specification shall be marked with the designation as specified in Clause 4.

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