About airDEFender™ Diesel Exhaust Fluid

Oleo Energies Inc. manufactures and distributes airDEFender™ high purity Diesel Exhaust Fluid (DEF). airDEFender™ diesel exhaust fluid is used in a process called Selective Catalytic Reduction (SCR) to reduce exhaust emission levels of nitrogen oxides (NOx) in diesel engines. airDEFender™ meets or exceeds the relevant ISO 22241 international standard. The standard, outlined in ISO 22241, requires airDEFender™ diesel exhaust fluid to contain 32.5% solution of high-purity urea in demineralised water (Aqueous Urea Solution 32.5%). airDEFender™ is certified by the American Petroleum Institute (API) as a stamp of purity.

The quality control process incorporates many verifications and checks to ensure airDEFender™ always is produced to the high standards demanded by Oleo and our customers.

Equipment checks are routinely done to ensure all equipment, such as scales and flow meters are calibrated correctly ensuring exact measurements of our raw materials and finished products.

Quality assurance testing is carried out on the raw materials.
• Urea – only the highest purity of DEF grade urea can be used when manufacturing diesel exhaust fluid.
• Water – purity testing of our water which has been filtered through a multi-stage system.

Once these checks are performed the manufacturing process can begin.
The quality of each batch is tested in our on-site laboratory with our own specific refractometers to ensure the urea content specifications are met and strictly adheres to the relevant ISO22241 standards.
When you take delivery of airDEFender™ you know you are using the highest grade diesel exhaust fluid in your SCR system!

SCR Technology

deskIn 2000 EPA (Environmental Protection Agency) published the Tier 2 Emission Standards for Light Duty and Heavy Duty Vehicles mandate that regulates new strict emission control standards beginning January 1, 2010. Starting from that date, no new diesel-burning vehicles can be sold without meeting the Tier 2 emission standard: 0.2 grams of nitrogen oxide (NOx) per brake horsepower-hour. Vehicle and engine manufacturers have developed Selective Catalytic Reduction (SCR) technology, which uses DEF to convert NOx into harmless nitrogen gas. The ratio of the mix is 32.5% urea and 67.5% de-ionised water.

DEF is carried onboard the vehicle in a separate tank. It is injected into the exhaust gases as a post combustion process through the SCR system, where it breaks harmful NOx (Nitrous Oxide) emissions down into mostly Nitrogen and water. Sensors in DEF tanks will notify the driver if volume is low or if the product concentration is not of good quality. Another sensor will indicate if the NOx level in the tailpipe exhaust is too high. These sensors will need to be maintained by fleet owners. A potential problem in handling DEF is that it freezes at 11°F. Also elevated temperatures causes the DEF to decompose, releasing ammonia. ISO standards limit the total ammonia to 0.2 percent, and so the shelf life of the fluid is limited if exposed to elevated temperatures for extended periods. ISO standards have very strict limits on contamination, which limit the materials that the fluid can contact. Per ISO standards, the suitable materials are stainless steels, titanium, hastelloys and several plastics, so long as they are free of additives.Materials specifically not recommended include non-ferrous metals and alloys (copper, aluminum, magnesium, silver, zinc, lead), solders containing non-ferrous metals, and nickel-coated plastics and metals. Bottles, drums and totes are most commonly made of polyethylene. Large storage tanks can be made of stainless steel or coated carbon steel.


Since the passing of the Clean Air Act in the 1970s, the Environmental Protection Agency (EPA) has regulated emissions of NOx, particulate matter and other pollutants from road vehicles, electric utilities, and off-road equipment.

The EPA adopted emissions standards for heavy-duty vehicles in 2001 which would govern models manufactured from 2007 onwards and required manufacturers to reduce particle matter emissions to 0.01 g/bhp-hr and NOx emissions to 0.20 g/bhp-hr. Between 2007 and 2009 there was a phase-in period for which allowed NOx emissions of 1.2 g/bhp-hr, but from 2010 all medium and heavy duty diesel vehicles have had to meet the standards. Manufacturers that exceeded requirements before 2010 such as Cummins and Navistar are allowed NOx emissions up to 0.5 g/bhp-hr under a bank and trade system.

ISO Standard

The production, handling and transportation of Diesel Exhaust Fluid (DEF) is governed by the ISO 22241 standards. The key points are:
• Diesel Exhaust Fluid (DEF) must have a urea concentration of 32.5% by weight. This concentration was chosen because it is has the lowest freezing temperature, 11°F.
• The maximum level of impurities such as calcium and various metals such as iron, copper, zinc and aluminum are clearly specified. These limits are very low, to ensure reliable operation of the SCR system.
• This definition excludes the use of urea grades used in agriculture, and requires water purified by distillation or deionization or similar.
• Materials which are safe for the storage and handling of Diesel Exhaust Fluid (DEF). Carbon steel and aluminium are not allowed.
• Handling guidelines.

American Petroleum Institute

The American Petroleum Institute (API) runs a voluntary program for certifying DEF producers and distributors through its Diesel Exhaust Fluid Certification Program. Suppliers who have been approved by the API display its logo on their DEF products, guaranteeing the quality of your purchase and its suitability for proper SCR operation. All DEF marketers listed on www.apidef.org are API certified.

Storage and Handling

airDEFender™ Diesel Exhaust Fluid should be stored in a cool, dry, well-ventilated area, out of direct sunlight. Ideally, the temperature should be between 0° C – 30° C in order to ensure a shelf life of at least one year.

Only certain materials can come into contact with DEF. Stainless steel and HDPE plastics are safe to use. Other metals may corrode when they come in contact with DEF and contaminate the product as a result. This causes it to be ineffective in achieving the desired emissions standards as well as causing potential damage to your engine and the SCR catalyst.

DEF should only be used in well-ventilated areas. Try to avoid any contact with eyes, skin or clothing. You should always wash your hands with soap and water after handling. Containers should be kept out of extreme heat and prolonged direct sunlight as well as out of reach of children. Keep containers tightly closed when not in use.

airDEFender™ is a WHMIS controlled substance, considered to be an irritant to the eyes and skin. It is a stable and non-flammable solution. When used under normal conditions, it is not expected that there would be any significant health hazards.