What is Diesel Exhaust Fluid (DEF)?

DEF is a high-purity solution of urea in deionized water (32.5% urea and 67.5% deionized water) used in diesel engines with Selective Catalytic Reduction (SCR) technology to reduce nitrogen oxide (NOx) emissions. It is non-toxic, non-flammable, and safe to handle.

How does DEF work?

DEF is injected into the exhaust stream of diesel vehicles, where it reacts with NOx in the SCR catalyst to form harmless nitrogen and water vapor. This process significantly reduces harmful emissions from diesel engines.

Why is DEF important for diesel engines?

DEF is essential for meeting environmental regulations that limit NOx emissions. Using DEF ensures that diesel engines run cleaner and more efficiently, reducing their environmental impact and helping operators avoid fines and penalties for non-compliance.

How do I store DEF?

DEF should be stored in a cool, dry, and well-ventilated area, away from direct sunlight. The ideal storage temperature is between 12°F (-11°C) and 86°F (30°C). Proper storage ensures the longevity and effectiveness of the fluid.

Can DEF freeze?

Yes, DEF can freeze at temperatures below 12°F (-11°C). However, it will thaw and return to its usable state without any loss of quality. Most diesel vehicles with SCR systems have heating elements to prevent DEF from freezing during operation.

How often do I need to refill DEF?

The consumption of DEF depends on the vehicle's fuel usage. On average, DEF is consumed at a rate of about 2-3% of diesel fuel consumption. This means that for every 100 gallons of diesel fuel, you will use about 2-3 gallons of DEF.

Is DEF hazardous to handle?

No, DEF is non-toxic, non-flammable, and safe to handle. However, it is recommended to avoid contact with skin and eyes, and to rinse thoroughly with water if accidental contact occurs.

What happens if I run out of DEF?

Running out of DEF can cause the vehicle's engine to lose power and eventually prevent it from operating. Most diesel vehicles with SCR systems will provide warnings and alerts as DEF levels get low, ensuring you have time to refill before running out completely.

Where can I purchase DEF?

You can purchase high-quality DEF from reputable suppliers. For bulk purchasing, consider the DEF Diesel Exhaust Fluid - 55 Gallon Drum available on Sinopec's website.

Understanding DEF and its importance for diesel engines is crucial for maintaining compliance with emission regulations and ensuring the longevity and efficiency of your vehicle. By addressing these FAQs, we hope to provide you with the information needed to make informed decisions about using DEF. For a reliable supply of DEF, visit our product page.