FAQ's
How does Diesel Exhaust Fluid (DEF) work?
DEF is added to exhaust fumes before they reach the catalytic converter.
The addition of DEF reduces some major pollutants by up to 90% by making
the catalytic converter much more efficient.
Why is DEF so special?
DEF is a high purity solution with extremely strict specifications
(ISO 22241) that have been developed specially for use by SCR systems
(the system whereby DEF is added to the exhaust fumes).
What is the average DEF consumption?
It is estimated that the DEF consumption represents 3% to 4% of the
total diesel consumption.
How should DEF be stored and handled?
DEF will freeze below 12°F and begin to deteriorate if stored
at high temperatures for extended periods of time without being used.
DEF must be kept in a clean storage tank that is made of compatible material
to prevent contamination.
Is DEF corrosive?
DEF is non-toxic and poses no serious risk to humans, animal or the
environment if properly handled. The product is slightly alkaline with
a pH of approximately 9.0 so should not be kept in contact with aluminum,
brass or mild steel. Stainless Steel and plastic tanks and fittings are
recommended. Prolonged skin contact may cause irritation.
How will DEF be packaged?
Today you can purchase DEF from bulk producers, blenders and distributors.
DEF is currently available in the following volumes:
- 1 - 2 ½ gallon jugs
- 55 gallon drums
- 275 - 330 gallon totes
- 800 - 2,000 gallon mini-bulk storage
How can I determine the proper storage tank size needed for my SCR fleet?
Click on this DEF Storage Calculator link.