As the name implies, Marine DEF is used in many marine applications but is increasingly used in rail and other land-based applications. Marine DEF, or AUS 40, is an aqueous high-purity urea solution at a concentration of 40% that is needed to operate converters with SCR in applications with large combustion engines. Tests licensed fluids to ensure that they meet program requirements.Ī complete list of licensees is available on our Licensee Directory.ĪPI has launched the Marine Diesel Exhaust Fluid Certification Program.Provides rigorous monitoring of fluids in the marketplace. ![]() Gives consumers a choice of quality brands from which to choose.Identifies for consumers diesel exhaust fluids that meet diesel engine manufacturer requirements.Diesel exhaust fluid marketers that have demonstrated that their products satisfy the requirements of the most recent and applicable edition of ISO 22241, Diesel engines – NOx reduction agent AUS 32, may be licensed to display the API Diesel Exhaust Fluid Certification Mark.ĪPI Diesel Exhaust Fluid Certification has many benefits: The API Diesel Exhaust Fluid (DEF) Certification Program is a voluntary program designed to certify and monitor the quality characteristics of diesel exhaust fluid intended for use in motor vehicles with diesel engines. This standard, published by the International Organization for Standardization (ISO), is intended to ensure that the diesel exhaust fluid used in SCR-equipped cars and trucks provides the purity required by diesel engine manufacturers and the quality to preserve the emissions control system and the environment. ![]() For the SCR unit to operate properly, the DEF must meet an exacting purity standard. To meet these requirements, many diesel engine manufacturers use Selective Catalytic Reduction (SCR), an emissions aftertreatment technology that converts nitrogen oxides (NOx) in the diesel-engine exhaust stream into nitrogen and water vapor, two natural components in the air we breathe.ĭiesel exhaust fluid (also referred to as DEF or AUS 32) is injected into the diesel exhaust stream and the heat from the exhaust, the fluid, and a catalyst convert the NOx into the harmless gases.ĭiesel exhaust fluid is a 32.5% solution of technically pure urea in purified water. ![]() Environmental Protection Agency (EPA) emissions requirements. Today, cars and trucks and other applications using diesel engines sold in the United States must meet stringent U.S.
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