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AUS 32 (Aqueous Urea Solution 32.5%) is a high-purity, 32.5% urea and 67.5% deionized water mixture used to reduce Nitrogen Oxide (
) emissions in diesel engines equipped with Selective Catalytic Reduction (SCR) systems. It is non-toxic, colorless, and standardized by ISO 22241 for use in trucks, cars, and industrial machinery.
Key Synonyms and Names:
- AdBlue (Registered trademark, common in Europe)
- DEF (Diesel Exhaust Fluid) (Generic term, common in North America)
- ARLA32 (Agente Redutor Líquido de Óxido de Nitrogênio Automotivo, common in South America)
- Industrial Urea Solution (Used for emissions control)
Common Usage Examples:
- Modern Diesel Vehicles: Used in trucks, passenger cars, trains, and agricultural equipment fitted with Selective Catalytic Reduction (SCR) technology to meet Euro 4-6 or EPA emissions regulations.
- Industrial Emissions Control: Utilized in industrial plants, power plants, and marine vessels to treat exhaust gases and remove NOx pollutants.
- Specific Engine Types: Essential for heavy and light commercial vehicles using BS4, BS6, or equivalent high-efficiency diesel engines.
Key Characteristics:
- Composition: high-purity urea,demineralized water.
- Freezing Point: Freezes at roughly (), but can thaw without quality loss.
- Safety: Non-hazardous, non-toxic, but should be kept away from high heat to avoid forming ammonia.
- Storage: Must be stored in special tanks (usually marked with a blue cap) distinct from the fuel tank.
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6 things to know about AdBlue®, DEF, AUS32, ARLA32
Palamatic Process
https://www.palamaticprocess.com › en-us › blog › six-...
Palamatic Process
https://www.palamaticprocess.com › en-us › blog › six-...
AUS32 is the generic term used for all urea solutions manufactured in accordance with ISO22241. All of these names relate to urea solutions that can be used in ...Read more
People also ask
What is AUS 32 in DEF?
Veedol Max Shield DEF (AUS 32) is an aqueous urea solution meets the stringent requirements of international quality standards. It is a blend of high purity automotive grade urea and deionized water specially designed for use in vehicles fitted with SCR technology system.Jan 1, 2026
Max Shield DEF (AUS 32) - Veedol India
Veedol India
https://www.veedolindia.com › default › files › assets › pdf
Veedol India
https://www.veedolindia.com › default › files › assets › pdf
What is a 32.5 DEF solution?
DEF is a 32.5 % solution of high-purity, synthetically manufactured urea in de-mineralized water. It is a safe-to-use fluid. Diesel exhaust fluid (DEF) is used in diesel engines with SCR systems to reduce emissions. As the world's largest DEF producer, Yara offers security of supply and reliable quality DEF.
Diesel Exhaust Fluid | Yara International
Yara
https://www.yara.com › industrial-nitrogen › diesel-exha...
Yara
https://www.yara.com › industrial-nitrogen › diesel-exha...
How to make 32.5 urea solution?
o Take 67.5% deionized water in a stainless steel mixing tank. o Heat the water to 40–50°C to help dissolve the urea faster. o Gradually add 32.5% high-purity urea into the heated water while stirring. o Ensure the urea is completely dissolved to form a clear solution. o Maintain a pH of 9.0–10.0 during mixing.
How to Make AdBlue (Diesel Exhaust Fluid) Using Urea - atdmco.com
atdmco.com
https://atdmco.com › wp-content › uploads › 2025/02
atdmco.com
https://atdmco.com › wp-content › uploads › 2025/02
Is AdBlue basically water?
AdBlue® is made of a colourless mixture of high-purity urea (32.5%) and deionised water (67.5%), as set out in the ISO 22242 standard. Urea contains ammonia; the active ingredient in AdBlue® that reacts with NOx and neutralises it before it enters the atmosphere.
AdBlue®: What it is and how it works | Motorists - Total Energies UK
Total Energies UK
https://totalenergies.co.uk › adblue-what-it-is-how-it-works
Total Energies UK
https://totalenergies.co.uk › adblue-what-it-is-how-it-works
Web results
Diesel Exhaust Fluid (DEF)
American Petroleum Institute | API
https://www.api.org › products-and-services › diesel-ex...
American Petroleum Institute | API
https://www.api.org › products-and-services › diesel-ex...
Diesel exhaust fluid is a 32.5% solution of technically pure urea in purified water. For the SCR unit to operate properly, the DEF must meet an exacting purity ...Read more
Diesel exhaust fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
In the international standard defining DEF (ISO 22241), it is referred to as AUS 32 (aqueous urea solution 32%). DEF is also sold as AdBlue, a ...Read more
AUS 32 Urea Solution SAFETY DATA SHEET
Hino Trucks
https://www.hino.com › content_media › raw › s...
Hino Trucks
https://www.hino.com › content_media › raw › s...
PDF
Feb 16, 2017 — Urea solution forms ammonia, cyanuric acid, biuret, and/or nitrogen oxides (NOx) upon decomposition. Hazardous Decomposition or. Byproducts:.Read more
5 pages
AUS 32 International Standards Manufacturers-Everadblu
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog › aus-32-interna...
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog › aus-32-interna...
Aqueous urea solution AUS 32 reduces nitrogen oxide emission from auto exhaust system. The solution is injected to diesel engine exhaust systems.Read more
ADBLUE (AUS32) UREA SOLUTION, DIESEL EXHAUST ...
techmation.com
https://www.techmation.com › uploads › 2015/10
techmation.com
https://www.techmation.com › uploads › 2015/10
PDF
As the name AUS32 suggests, AdBlue is made by using urea mixed with demineralised water resulting in a 32.5 % aqueous urea solution. It is colorless, non-toxic ...Read more
2 pages
Determination of Trace Elements in Aqueous Urea Solution ...
Agilent Technologies
https://www.agilent.com › library › applications
Agilent Technologies
https://www.agilent.com › library › applications
PDF
Apr 14, 2020 — SCR requires a high-quality diesel exhaust fluid (DEF), also known as AUS ... in Aqueous Urea Solution (AUS 32). Diesel Exhaust Fluid by ICP-OES.Read more
5 pages
DEF Tanks | Diesel Exhaust Fluid 101
National Tank Outlet
https://www.ntotank.com › blog › diesel-exhaust-fluid-...
National Tank Outlet
https://www.ntotank.com › blog › diesel-exhaust-fluid-...
May 1, 2023 — AUS 32 is an acronym for Aqueous Urea Solution with 32.5% urea, otherwise known as diesel exhaust fluid. AUS 32 is 32.5% by weight pure grade ...Read more
ADBLUE®, DEF, AUS32, ARLA32: Understanding Urea ...
LinkedIn · Zoe Lv
7 reactions · 2 years ago
LinkedIn · Zoe Lv
7 reactions · 2 years ago
DEF is a generic term used in the United States, while ARLA32 is used in South America. AUS32 is the generic term for all urea solutions ...Read more
Automotive Grade Urea Solution Process: AdBlue and DEF
Vaisala
https://www.vaisala.com › chemicals-allied-products › a...
Vaisala
https://www.vaisala.com › chemicals-allied-products › a...
Automotive urea AdBlue, also known as Diesel Exhaust Fluid (DEF), is the registered trademark for AUS32 (aqueous urea solution 32.5%).Read more