NOx reduction agent AUS 32 (AdBlue®)

Product: NOx reduction agent AUS 32 (AdBlue®)

DSTU ISO 22241-1:2023 (ISO 22241-1:2019, IDT) «Diesel engines. NOx reduction agent AUS 32. Part 1. Quality requirements»

NOx reduction agent AUS 32 (aqueous urea solution) – colourless clear liquid. It is needed to operate selective catalytic reduction (SCR) converter systems in motor vehicles with diesel engines.

Table 1: Physical and chemical properties of AUS 32

No	Property	Limits
1	Urea content ^a, % (mass fraction)	31,8	33,2
2	Refractive index (nD20)	1,3814	1,3843
3	Alkalinity as NH₃, % (mass fraction)	-	0,2
4	Biuret, % (mass fraction)	-	0,3
5	Aldehydes, mg/kg	-	5
6	Insoluble mater, mg/kg	-	20
7	Phosphate (РО₄), mg/kg	-	0,5
8	Aluminium, mg/kg	-	0,5
9	Calcium, mg/kg	-	0,5
10	Chromium, mg/kg	-	0,2
11	Copper, mg/kg	-	0,2
12	Iron, mg/kg	-	0,5
13	Potassium, mg/kg	-	0,5
14	Magnesium, mg/kg	-	0,5
15	Sodium, mg/kg	-	0,5
16	Nickel, mg/kg	-	0,2
17	Zinc, mg/kg	-	0,2
18	*Density at 20 ^оС, kg/m³	1087,0	1093,0

Note: ^a Target value 32.5% (mass fraction).

* The index is not specified by DSTU ISO 22241-1:2023 (ISO 22241-1:2019, IDT)

Throughout the whole supply chain, AUS 32 (AdBlue®) is expected to remain within the specifications according to ISO 22241-1 for at least during the time, specified in Table 2, depending on the constant ambient temperature in which AUS 32 is stored.

Table 2: Shelf life depending on temperature

Constant ambient temperature during storage, °С	Minimum shelf life, months
≤10	36
≤25	18
≤30^а	12
≤35	6
>35	Significant reduction of shelf life: Check each batch before use
^а To protect AUS 32 from decomposition, long-term transportation or storage above 30 °C should be avoided. To prevent AUS 32 from crystallization, storage below minus 5 °C should be avoided

The integrated management system is certified for compliance with the requirements of ISO 9001:2015 - Certificate No. GIUA-0001-QC; ISO 14001:2015 - Certificate No. GIUA-0001-EC and ISO 45001:2018 - Certificate No. GIUA-0001-OHC.

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