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    AI Overview
    ISO 22241 is the international standard defining the quality, handling, and storage of Diesel Exhaust Fluid (DEF) to ensure proper functioning of Selective Catalytic Reduction (SCR) systems. It dictates that compliant DEF (often branded AUS 32) must be a
    32.5
    %
     high-purity urea solution in de-ionized water, free of contaminants like metal or excessive biuret. 
    Key Aspects of ISO 22241 (AUS 32): 
    • Composition:
      32.5
      %
       high-purity urea (
      𝐶𝑂
      (
      𝑁𝐻2
      )2
      ) and
      67.5
      %
       de-ionized water.
    • Concentration Control: The urea concentration must be strictly maintained (between
      31.8
      %
       and
      33.2
      %
      ) to ensure proper urea-water balance.
    • Contaminants: Extremely low levels of impurities, including minerals like iron, calcium, and sodium, are permitted to prevent damage to the SCR catalyst
      .
    • Material Compatibility: Only specific materials (e.g., high-density polyethylene, stainless steel) are approved for storage and handling to prevent contamination.
    • Quality Assurance: Requires a "Certificate of Analysis" from suppliers, often marked with the API (American Petroleum Institute) certification seal. 
    ISO 22241 Components:
    The standard is divided into several parts covering different aspects: 
    • ISO 22241-1: Defines quality requirements.
    • ISO 22241-2: Outlines test methods.
    • ISO 22241-3: Focuses on handling, transportation, and storing.
    • ISO 22241-4: Covers refilling interface. 
    Why ISO 22241 Matters:
    Using non-compliant, impure, or improperly concentrated DEF can lead to severe damage to the engine's SCR system, resulting in expensive repairs and increased emission of nitrogen oxides (
    NOxcap N cap O sub x
    𝑁𝑂𝑥
    ). 
    • Fluid Lifehttps://www.fluidlife.com
      DEF Specifications: ISO 22241 - Fluid Life
      Download Tech Document. Additional Resources. This table outlines the specific physical and chemical properties Diesel Exhaust Flu...
    • American Petroleum Institute | APIhttps://www.api.org
      API | Diesel Exhaust Fluid (DEF) - American Petroleum Institute
      The API Diesel Exhaust Fluid (DEF) Certification Program is a voluntary program designed to certify and monitor the quality charac...
    • Proformance Supplyhttps://proformancesupply.com
      ISO 22241 Compliant DEF Transfer Systems | Proformance Supply
      ISO 22241 is an international standard that defines the quality requirements for diesel exhaust fluid (DEF). The standard focuses ...
    Show all
    • Fluid Lifehttps://www.fluidlife.com
      DEF Specifications: ISO 22241 - Fluid Life
      Download Tech Document. Additional Resources. This table outlines the specific physical and chemical properties Diesel Exhaust Flu...
    • American Petroleum Institute | APIhttps://www.api.org
      API | Diesel Exhaust Fluid (DEF) - American Petroleum Institute
      The API Diesel Exhaust Fluid (DEF) Certification Program is a voluntary program designed to certify and monitor the quality charac...
    • Proformance Supplyhttps://proformancesupply.com
      ISO 22241 Compliant DEF Transfer Systems | Proformance Supply
      ISO 22241 is an international standard that defines the quality requirements for diesel exhaust fluid (DEF). The standard focuses ...
    • Thunder Creek Equipmenthttps://thundercreek.com
      DEF and the ISO 22241 Standard
      The ISO 22241 standard covers best practices for handling, transporting, and storing diesel exhaust fluid (DEF). The standard ensu...
    • Rudolph Research Analyticalhttps://rudolphresearch.com
      DEF Testing for ISO 22241 with Refractometers and Density Meters
      Refractive Index Testing A core requirement of ISO is the precise measurement of refractive index, which correlates directly with ...
    • Domestic Fuelshttps://www.domesticfuels.com
      Ocean Blue DEF Meets ISO Standards
      The ISO 22241 standard for producing, handling, and transporting diesel exhaust fluid (DEF) specifies a limit of 0.5 ppm sodium co...
    • Yara UShttps://www.yara.us
      What is Diesel Exhaust Fluid | Where can I order DEF? | Yara United States
      DEF is a safe, 32.5% solution of high-purity, synthetically manufactured urea in de-mineralized water. It's used in diesel engines...
    • Ultra1Plushttps://ultra1plus.com
      Diesel Exhaust Fluid Explained - Ultrachem LLC, DBA Ultra1Plus™️
      Biuret is a contaminant that can be found in urea, an ingredient in diesel exhaust fluid (DEF). DEF is a mixture of urea and deion...
    • Blue Sky Diesel Exhaust Fluidhttps://blueskydefna.com
      ISO Standards for Diesel Exhaust Fluid Manufacturing
      The International ISO Standard ensures that products are safe to use and reliable. ISO part three, 22241 standards, are specific t...
    • airnoxblue.co.zahttps://airnoxblue.co.za
      Know Before Buying AdBlue® Diesel Exhaust Fluid Used in Automobile ...
      That being said, it is essential to ensure you get the right AdBlue® for vehicles, with the ISO 22241 label (including ISO-22241-1...
    • fluidlife.com
    • proformancesupply.com
    • ultra1plus.com
    • yara.us
    • blueskydefna.com
    • rudolphresearch.com
    • domesticfuels.com
    • thundercreek.com
    • api.org
    • airnoxblue.co.za
    • oceanstateoil.com
    • felitecn.com
    • standards.iteh.ai
    Show more
    Popular products
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    People also ask
    What is ISO 22241 compliant DEF?
    An error has occurred. Please try again later.
    What is ISO 22241?
    An error has occurred. Please try again later.
    What is the difference between ISO 22241 and 22241 1?
    ISO 22241 is the international standard for Adblue. ISO 22241-1 is the specific part of the standard that specifies the quality characteristics. Basically they are referring to the same ISO standard so are both fine. It's just that one is being a bit more specific about the part of the standard.Jun 23, 2025

    Confused about types of AdBlue : r/drivingUK - Reddit


    Reddit
    https://www.reddit.com › drivingUK › comments › conf...
    Reddit
    https://www.reddit.com › drivingUK › comments › conf...
    Is diesel exhaust fluid the same as DEF fluid?
    While DEF does contain 32.5 percent urea (a compound found in urine), the urea used to produce diesel exhaust fluid is entirely synthetically produced to ensure maximum purity. The other 67.5 percent is deionized water.Dec 15, 2025

    What Is Diesel Exhaust Fluid (DEF)? - RealTruck


    RealTruck
    https://realtruck.com › blog › what-is-diesel-exhaust-flui...
    RealTruck
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    Web results

    ISO 22241 standards


    ISO - International Organization for Standardization
    https://www.iso.org › obp
    ISO - International Organization for Standardization
    https://www.iso.org › obp

    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

    DEF Specifications: ISO 22241


    Fluid Life
    https://www.fluidlife.com › resource-center › documents
    Fluid Life
    https://www.fluidlife.com › resource-center › documents
    Jul 6, 2022 — This table outlines the specific physical and chemical properties Diesel Exhaust Fluid (DEF) is required to have according to ISO 22241 ...Read more

    DEF and the ISO 22241 Standard


    Thunder Creek Equipment
    https://thundercreek.com › resources › news › def-and-t...
    Thunder Creek Equipment
    https://thundercreek.com › resources › news › def-and-t...
    Thunder Creek's diesel exhaust fluid (DEF) delivery solutions meet ISO 22241 standard for transporting & storing DEF.

    Diesel Exhaust Fluid, Blue DEF, Jug, 2.5 Gal, API/ISO- ...


    Cal-Pacific Supply
    https://www.calpacsupply.com › product-page › diesel-...
    Cal-Pacific Supply
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    Diesel Exhaust Fluid, Blue DEF, Jug, 2.5 Gal, API/ISO-22241-1. $14.99Price. Quantity*. ADD TO CART. About Us · Authorized Distributors.Read more
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    Diesel Exhaust Fluid, Blue DEF, Jug, 2.5 Gal, API/ISO-22241-1


    zoro.com
    https://www.zoro.com › ... › Automotive Exhaust Fluids
    zoro.com
    https://www.zoro.com › ... › Automotive Exhaust Fluids
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    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
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    Web results

    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
    In stores nearby
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    Web results

    DEF Testing for ISO 22241 with Refractometers and ...


    Rudolph Research Analytical
    https://rudolphresearch.com › def-testing-for-iso-22241...
    Rudolph Research Analytical
    https://rudolphresearch.com › def-testing-for-iso-22241...
    Understand how DEF testing ensures ISO 22241 compliance by verifying 32.5% urea concentration with refractometers and density meters.

    What is BlueDEF?


    BlueDEF Diesel Exhaust Fluid
    https://bluedef4you.com › what-is-bluedef
    BlueDEF Diesel Exhaust Fluid
    https://bluedef4you.com › what-is-bluedef
    ISO standard 22241 was created to insure fluid quality of diesel exhaust fluid. BlueDEF® is manufactured in accordance to these strict standards giving you ...Read more
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