AiRx™ Diesel Exhaust Fluid Information

Beginning in 2010, the EPA will require every newly manufactured diesel engine to reduce nitrogen oxide (NOx) emissions. NOx is a compound that breaks down rapidly as it reacts with substances in the air, contributing to acid rain and the formation of ground level ozone or smog.

What is DEF?

The leading technology in NOx reduction for diesel engines is Selective Catalytic Reduction (SCR), a process that requires a reducing agent known as diesel exhaust fluid (DEF). DEF is an ultra high purity 32.5% urea solution that, when injected into exhaust gas, will break down NOx molecules into harmless nitrogen and water. Airgas supplies DEF under the brand AiRx™. AiRx™ Diesel Exhaust Fluid complies with ISO 22241 and is API certified.

Who's Using it?

Three of the four leading OEM's have chosen SCR, including Volvo/Mack, Cummins, and Detroit Diesel. Navistar/International is using NOx credits and EGR. In 2014, off-road engines will use SCR as well.

Important Facts

• The average over the road truck will consume 400 gallons per year
• DEF will have its own tank with a 9mm opening
• DEF is not a diesel additive
• Special stainless steel dispensing equipment is required
• SCR engines average 5-6% in fuel economy
• When DEF tank is empty the engine will go into "limp mode" (5 MPH) after 40 hours