DIESEL EXHAUST FLUID

What is DEF?

Diesel Exhaust Fluid (DEF) is a solution of high purity urea and de-ionized water. It is the operating ﬂuid required in vehicles using Selective Catalytic Reduction (SCR) technology. Engineers developed the technology to meet the 2010 emission standards for reducing nitrogen oxide (NOx) exhaust emissions from diesel engines. The ﬂuid is contained in a designated DEF tank and it is sprayed into the exhaust system before the catalytic converter breaks down NOx into harmless nitrogen and water vapour. DEF has a shelf life of 12 months if the required storage conditions are followed. However, DEF that has been stowed for a longer period may be usable if analyzed to conﬁrm that it still meets the DEF speciﬁcation. Storage facilities can be adapted to suit customer needs.

Available in bulk drums and 2.5/gal cases
Diesel Exhaust Fluid Dispensing Equipment

Answers to your DEF Questions

DEF should be stored in a cool, dry, well-ventilated area at a constant temperature. For optimal shelf life (12 months), store between 86°F/30°C and 12°F/-11°C. It is better to keep DEF indoors, but an outdoor heated enclosure/container is also suitable. Avoid storing in direct sunlight. DEF will freeze at 12°F/-11°C. However, frozen ﬂuid can be thawed and used without concerns of product degradation.