Diesel Exhaust Fluid (DEF) is a non-toxic, high purity solution comprised of 32.5% urea and 67.5% de-ionized water. Using this fluid in diesel-powered vehicles (such as trucks, buses, and tractors) helps to reduce the amount of nitrogen oxides (NOx) emitted into the air by 90%. DEF is not a fuel additive and must be filled into the dedicated Diesel Exhaust Fluid tank on your diesel vehicle.

We have been providing Diesel Exhaust Fluid (DEF) solutions to customers, distributors, and dealerships in the North American trucking market since 2009. With over 1,000,000 million gallons of bulk API certified Diesel Exhaust Fluid (DEF) storage across North America, we're ready to meet your needs!


Diesel Exhaust Fluid is produced to an international standard (ISO 22241). To meet 2010 EPA Diesel Emission Standards to reduce the amount of NOx emitted by diesel engines, several engine manufactures employed Selective Catalytic Reduction (SCR) as an after-treatment technology combined with Exhaust Gas Recirculation (EGR).

The combination of SCR and DEF reduces particulate matter emissions by breaking down NOx into harmless nitrogen and water molecules. With the use of DEF, 2.6 million tons of smog-causing NOx emissions will be reduced yearly.

EPA Emissions Standards

In 2000, the Environmental Protection Agency (EPA) proceeded with its rule to make heavy-duty on-road equipment (such as trucks and buses) run cleaner with the 2007 Highway Rule. The EPA stated by “beginning with the 2007 model year, the harmful pollution from heavy-duty highway vehicles will be reduced by more than 90%.”

In 2010, the United States EPA required diesel truck emissions to contain a 97% reduction in their sulfur content. Engine manufacturers had come up with two advanced pollution control technology options for cars, trucks, and buses which include Selective Catalytic Reduction (SCR) and Exhaust Gas Recirculation (EGR).

Selective Catalytic Reduction (SCR)

Selective Catalytic Reduction (SCR) is an exhaust after treatment system that injects a small amount of Diesel Exhaust Fluid (DEF) into the exhaust. DEF is mixed with the exhaust in the presence of a catalyst turning NOx (oxides of nitrogen – a harmful pollutant that contributes to smog and acid rain) into innocent nitrogen and water vapor.

The SCR system requires high quality Diesel Exhaust Fluid to run efficiently: ensure you're purchasing the product from a reputable distributor to prevent contamination from damaging your diesel vehicles.

Exhaust Gas Recirculation (EGR)

Exhaust Gas Recirculation (EGR) is another way to reduce nitrogen oxide (NOx) formation. In an EGR system, engine exhaust is recycled back through the engine to dilute the oxygen. Almost all engine manufacturers’ use a form of EGR, as it takes both EGR and SCR to achieve near-zero nitrogen oxide (NOx) emissions.

Most major diesel truck manufacturers have opted to use SCR technology to meet the EPA emissions standards for nitrogen oxide (NOx) reduction. SCR is a cost effective solution and provides:

  • Better fuel economy for your fleet
  • Improves engine lubrication and filter life
  • Meets 2010 vehicle emission standards for diesel engines

API Certification

The American Petroleum Institute (API) is the only national trade organization that certifies the quality of DEF to international standards and licenses manufacturers who consistently meet these standards set by the International Organization for Standardization (ISO).

The API Diesel Exhaust Fluid Certification Program is a voluntary program designed to certify and monitor DEF quality. API issues a seal to those manufacturers who are committed to quality and meet specific performance requirements. UltraPure® DEF is certified by API and proudly displays their seal on our packaging.

What this means to our customers:

  • Provides rigorous monitoring of fluids in the marketplace
  • Identifies brands meeting diesel engine manufacturer requirements
  • Helps consumers easily recognize those brands

Diesel Exhaust Fluid Markets


In 2010, the EPA mandated that all diesel-powered vehicles must reduce their release of NOx emissions. The on-road sector was the first to be effected, which required all on-road vehicles manufactured beginning in 2010 must be equipped with a Selective Catalytic Reduction (SCR) or Exhaust Gas Recirculation (EGR) system.


In 2008, the EPA implemented a new tier 4 emissions standard to reduce off-road diesel engine emission which successfully concluded in 2015. The new standard applies to all off-road diesel engines used in a wide range of construction, agricultural, and industrial equipment. Nitrogen (NOx) emission levels are said to be decreased by more than 90 percent.


In 2008, the EPA finalized the program to reduce diesel locomotive emissions where any locomotive engine manufactured in 2015 and later must comply with the new exhaust aftertreatment technology. Selective Catalytic Reduction (SCR) is used to reduce nitrogen (NOx) emissions, which are said to decrease as much as 80 percent.


The EPA regulations to reduce NOx emissions on all diesel powered engines also applies to newly manufactured marine equipment, as well as vessels that are remanufactured by their owners or operators. All vessels with 600 KW (804 HP) and above are phased in with the 2014 EPA Emissions Standards requiring vehicles to incorporate an exhaust aftertreatment technology.


We offer high-quality UltraPure® Diesel Exhaust Fluid in a variety of packaging sizes, including 2.5 Gallon Jugs, 55 Gallon Drums, 330 Gallon Totes, mini-bulk, and bulk. Not sure what package size fits your needs? Check out the DEF Consumption Calculator today!

Diesel Exhaust Fluid Jugs

2.5 Gallon JUGS

55 Gallon DRUMS

Diesel Exhaust Fluid Tote

330 Gallon TOTES


Driving toward a green tomorrow®