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ISO 22241

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ive-liter container of diesel exhaust fluid made from automotive-grade urea and purified water

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DEF Chemistry & Ingredients DEF Quality, Testing & Standards

What Is DEF Made Of? Urea, Water and Chemistry Explained

by definbulk

November 15, 2021

What Is DEF Made Of? Urea, Water and Chemistry Explained Diesel exhaust fluid looks like plain water, yet its formula is tightly...

Alice Qelvin

Our author researches Diesel Exhaust Fluid systems, vehicle maintenance, emissions technology, and troubleshooting to provide clear, accurate, practical guidance for diesel owners, drivers, technicians, and fleet professionals worldwide every day.

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DEF Crystallization Causes, Cleaning and Prevention

DEF Sensor Problems Symptoms, Testing and Repair

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

DEF System Problems, Causes, Derate, Reset and Repair

ISO 22241

What Is DEF Made Of? Urea, Water and Chemistry Explained

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© 2026, All Rights Reserved.

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Troubleshooting

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DEF Crystallization Causes, Cleaning and Prevention

DEF Sensor Problems Symptoms, Testing and Repair

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

DEF System Problems, Causes, Derate, Reset and Repair

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ISO 22241

What Is DEF Made Of? Urea, Water and Chemistry Explained

Subscribe to our newsletter and stay updated.

© 2026, All Rights Reserved.

DEF Guides

Troubleshooting

Follow Us