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FAQs About Diesel Exhaust Fluid Storage

What is the shelf life of diesel exhaust fluid in storage?

If diesel exhaust fluid is stored between the recommended temperatures of 12°F and 90°F, the expected shelf life is approximately 1 year.

Is it OK to store diesel exhaust fluid in high temperature areas?

Avoid storing diesel exhaust fluid at high temperatures whenever possible. When stored at temperatures between 12°F and 90°F, DEF can be expected to have a shelf life of approximately 1 year. When stored in an environment where high temperatures occur, typically over 90°F, this can lead to reduced shelf life and the formation of ammonia in the DEF.

Does diesel exhaust fluid freeze?

Yes. Diesel exhaust fluid will freeze if exposed to temperatures under 12°F, however, DEF that has frozen can still be used once it has thawed and has returned to a completely liquid state.

Is diesel exhaust fluid a hazardous substance?

No. By comparison to fluids such as diesel fuel and brake fluid, diesel exhaust fluid is less
hazardous, composed of naturally occurring components, and is biodegradable.
DEF is listed as a "non-hazardous" material and can be transported without a DOT
approved hazardous substance placard.

Will diesel exhaust fluid harm my aluminum container?

It is more important to consider what materials will harm the diesel exhaust fluid itself rather than what materials the DEF can harm as DEF will not harm most materials. The metal from aluminum tanks can leach into the DEF causing it to become contaminated.

What materials are compatible with diesel exhaust fluid?

Caution must be used when selecting an appropriate storage material for diesel exhaust fluid as there are many materials that will damage the DEF. DEF approved stainless steel and poly are common materials used in DEF storage. DEF approved storage containers are available from Keller-Heartt here.

Is it normal to see a build up of chalky, white material around the DEF storage containers and nozzles?

Yes, DEF can leave a chalky residue behind when the liquid evaporates. This is normal and can simply be cleaned off with deionized water.

If you are in need of DEF storage equipment, Keller-Heartt can help. Browse our complete selection of DEF storage equipment here and use the code STORAGE at checkout through 2/28/17 to save 5% on all storage products.
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