Technical Information for Diesel Exhaust Fluid

Diesel Exhaust Fluid handling procedures are essential for your safety and to maintain the quality of the product. Although DEF is a non-hazardous material, it should still be handled with care.

For use in all vehicles with Selective Catalytic Reduction (SCR) systems, DEF is manufactured with technically pure urea and de-ionized water, meeting:

  • Water grade 3 of ISO 3696
  • All 18 parameters of ISO 22241
  • DIN 7007:2005 standards


  • DO periodically clean the pump nozzle after filling by dipping the nozzle into a tub of clean water.
  • DO avoid overfilling; DEF can be difficult to clean up if spilled on the vehicle, dispenser or floor.
  • DO only use API certified DEF from companies who are also ISO certified. If filling at a retail location, ask if the product is API approved.
  • DO only use dedicated pumps, tanks, containers and delivery equipment for DEF.
  • DO only use designated equipment designed for use with DEF.
  • DO educate drivers and mark tanks on trucks to ensure DEF is not added to diesel fuel.
  • DON’T ever add DEF to the diesel fuel.
  • DON’T use DEF from suppliers who do not have API certification.
  • DON’T use DEF from suppliers who do not adhere to ISO standards.
  • DON’T use discolored DEF.
  • DON’T use DEF with visible particles floating in the fluid.
  • DON’T allow DEF to contact equipment containing materials such as copper, iron, zinc, aluminum or magnesium.
  • DON’T wait to clean up spilled DEF; it should be cleaned up as soon as possible.
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DEF Typical Chemical & Physical Properties
SDS (English)

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Quality Matters

The purity of DEF must be maintained at all levels along the supply line to ensure the end customer does not experience equipment or downtime costs associated without-of-spec DEF.

Why Quality Matters

3 Easy Testing Methods

Quality is of the utmost importance when handling and delivering Diesel Exhaust Fluid (DEF). We'll take you through three proper ways to test DEF quality.

View Testing Methods