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Diesel Exhaust Fluid (DEF) is a non-toxic, 32.5% urea and 67.5% deionized water solution used in Selective Catalytic Reduction (SCR) systems to convert harmful NOx emissions into nitrogen and water vapor. It is injected into the exhaust, reducing emissions by up to 90% while improving fuel efficiency.
Key Aspects of DEF and SCR Systems
- Composition & Standards: DEF is a high-purity solution meeting ISO 22241 specifications to prevent catalyst contamination.
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People also ask
Are DEF and SCR the same?
In response, vehicle manufacturers now install Selective Catalytic Reduction (SCR) systems in many new model diesel vehicles. A SCR system uses Diesel Exhaust Fluid (DEF) that is a mixture of deionized water and urea that reduces the nitrogen oxide emissions in a diesel engine.
Diesel Exhaust Fluid Systems | Comco Canada Ltd.
Comco Canada Ltd.
https://comcocanada.com › petroleum-installations › dies...
Comco Canada Ltd.
https://comcocanada.com › petroleum-installations › dies...
What is AdBlue diesel emissions fluid for SCR?
In an SCR system, Diesel Engine Fluid (aka DEF or AdBlue® - a mixture of purified water and urea) is injected into the SCR catalyst. The fluid reacts with the harmful NOx emissions to create nitrogen, water, and carbon dioxide – reducing emissions by up to 95%.
Supplying AdBlue® diesel exhaust fluid to commercial and fleet vehicles
Watson Fuels
https://watsonfuels.co.uk › lubricants › types-of-lubricants
Watson Fuels
https://watsonfuels.co.uk › lubricants › types-of-lubricants
What is the purpose of diesel exhaust fluid DEF in SCR systems?
When combined with the heat of the exhaust stream and the SCR catalyst, DEF helps convert NOx into harmless nitrogen and water vapor. DEF is non-toxic and non-flammable and it will not harm people, animals, equipment or the environment when handled properly.
DEF Facts - The Facts About the Fluid | Cummins Inc.
Cummins
https://www.cummins.com › en-na › engines › def-facts-...
Cummins
https://www.cummins.com › en-na › engines › def-facts-...
Is SCR the same as AdBlue?
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid- reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually DEF (Diesel Exhaust Fluid) – AdBlue.
SCR system and AdBlue FAQ's answered | Forté
Forté Lubricants
https://www.forteuk.co.uk › news › your-scr-system-and...
Forté Lubricants
https://www.forteuk.co.uk › news › your-scr-system-and...
Web results
DEF Products
McPherson Oil
https://www.mcphersonoil.com › Products
McPherson Oil
https://www.mcphersonoil.com › Products
Diesel Exhaust Fluid, or DEF, is used in a Selective Catalytic Reduction System (SCR) and reduces Nitrogen Oxide (NOx) emissions.Read more
Diesel Exhaust Fluid (DEF) Uses, Safety & SCR Systems
SafeRack
https://saferack.com › Glossary
SafeRack
https://saferack.com › Glossary
Jan 14, 2026 — Diesel Exhaust Fluid (DEF) is a critical component in modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems.Read more
DEF and SCR Maintenance Tips from the Diesel and ...
Mansfield Service Partners (MSP)
https://msp.energy › def-and-scr-maintenance-tips-from-t...
Mansfield Service Partners (MSP)
https://msp.energy › def-and-scr-maintenance-tips-from-t...
Jul 19, 2024 — An SCR system spreads an aqueous solution that contains 32.5% urea in the exhaust stream. This solution is known as Diesel Exhaust Fluid (DEF).Read more
About DEF and SCR
Quality DEF Solutions
https://www.qualitydefsolutions.com › def-scr
Quality DEF Solutions
https://www.qualitydefsolutions.com › def-scr
Diesel Exhaust Fluid (DEF) is an aqueous urea solution used in Selective Catalytic Reduction (SCR) to lower NOx concentration in the exhaust emissions from ...Read more
Diesel exhaust fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Diesel exhaust fluid is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made ...Read more
DEF Diesel Exhaust Fluid
Amazon.com
https://www.amazon.com › Quality-Chemical-Diesel-Ex...
Amazon.com
https://www.amazon.com › Quality-Chemical-Diesel-Ex...
Made from high purity urea and deionized water · Contains no chemical additives or other compounds that could cause SCR system failure · Meets the quality ...Read more
What is DEF? A Fleet Manager's Guide to SCR Systems in ...
Mercedes-Benz Van Center - Grand Rapids
https://www.mbvansgr.com › ... › Service and Parts Tips
Mercedes-Benz Van Center - Grand Rapids
https://www.mbvansgr.com › ... › Service and Parts Tips
What is Diesel Exhaust Fluid (DEF)?. Diesel Exhaust Fluid (DEF) is a non-hazardous, high-purity solution composed of 32.5% urea and 67.5% deionized water. It ...Read more
ISO 22241 AdBlue® Diesel Exhaust Fluid for SCR system
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › Other products
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › Other products
ISO 22241 AdBlue® Diesel Exhaust Fluid for SCR system. We produce high quality AdBlue® / DEF in strict accordance with ISO 22241 and din70070.Read more
Dispelling Myths: SCR and DEF simplicity in the Oil & Gas ...
Cummins
https://www.cummins.com › Home › Cummins Newsroom
Cummins
https://www.cummins.com › Home › Cummins Newsroom
Apr 23, 2021 — Are there downsides to using DEF in SCR systems? ... The largest drawback to using DEF is that the solution can freeze, which doesn't exactly make ...Read more
Discussions and forums
DEF (diesel exhaust fluid) and SCR Summary
Ford Truck Enthusiasts ·
15 years ago
DEF (diesel exhaust fluid) and SCR Summary
Ford Truck Enthusiasts ·
15 years ago
DEF Fluid Brand Preference - Page 2 - General Chat
Red Power Magazine ·
3 years ago
DEF Fluid Brand Preference - Page 2 - General Chat
Red Power Magazine ·
3 years ago
Exhaust Emission Info DEF/SCR/DPF
Diesel Bombers ·
10 years ago
Exhaust Emission Info DEF/SCR/DPF
Diesel Bombers ·
10 years ago
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