Q: What is DEF, and why is it so important?
A: DEF, or Diesel Exhaust Fluid, is a NOx
reduction agent comprised of 32.5% urea and
67.5% water. When used in diesel engines with
Selective Catalytic Reduction (SCR) technology,
DEF helps convert NOx into harmless nitrogen
and oxygen. Without DEF, NOx contributes to the
formation of smog and acid rain – both of which
are bad for people’s health, and the environment. Q: Is DEF a fuel additive?
A: No, DEF is not a fuel additive. It’s stored in
a separate tank so it doesn’t mix with the fuel,
or add to the fuel tank. Q: Is DEF safe?
A: According to the Environmental Protection Agency
(EPA), DEF is completely safe for handling and
storage. It is an odorless, colorless, non-flammable,
nontoxic solution that, when handled properly,
is non-hazardous to humans, equipment and
the environment. Q: How should DEF be stored?
A: Keep DEF in a cool, dry, well-ventilated area –
preferably away from direct sunlight. The
recommended temperature range for storage
is 12°-86° F, but temporary exposure to warmer
temperatures will not degrade its quality
or performance. | Q: What is DEF’s freezing temperature?
A: DEF begins to freeze at approximately 12° F.
Freezing and thawing do not affect the potency
of the product. Q: What are the consequences of running
an SCR-equipped engine without DEF?
A: Driving too long with no DEF can result in
a power reduction to 5 mph in most new
diesel vehicles. Q: How important is quality when it comes
to DEF, and how can I know I’m buying
a high-quality product?
A: The best way to know you’re buying from
a DEF distributor you can trust is to look for the
API Diesel Exhaust Fluid Certification mark.
Airgas features this mark on its website and
products to let customers know they’re buying
high-quality DEF that has met diesel engine
manufacturer requirements. Q: What should I consider when selecting
a DEF distributor?
A: Some important factors to consider when
choosing a DEF supplier include product
quality, coverage and delivery capability,
reliability and service. |