Diesel Exhaust Fluid (DEF)

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  • VERIFIED AT SERIAL RANGE

    VERIFIED AT SERIAL RANGE

    This part is listed within the factory-build configurations for this serial range, however current configuration may affect fit.
    VERIFIED AT SERIAL NUMBER

    VERIFIED AT SERIAL NUMBER

    This part is listed within the factory-build configurations for this serial number with the highest likelihood of a match, however current configuration may affect fit.
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  • VERIFIED AT SERIAL RANGE

    VERIFIED AT SERIAL RANGE

    This part is listed within the factory-build configurations for this serial range, however current configuration may affect fit.
    VERIFIED AT SERIAL NUMBER

    VERIFIED AT SERIAL NUMBER

    This part is listed within the factory-build configurations for this serial number with the highest likelihood of a match, however current configuration may affect fit.
    Compare

Core Deposit

Purchase of this product requires an additional deposit that is refundable when you return the old core to the selling Caterpillar dealer. The core deposit is refunded upon return of an acceptable core (used part) to your dealer. In order to qualify for a core deposit refund, the core must meet acceptance criteria. Typical criteria include, but are not limited to: must be fully assembled and complete, not cracked or broken, free of excessive rust or pitting, free of fire damage, and must be an acceptable Cat® part number. Core acceptance criteria may vary by product - please contact your dealer for full details.
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What is Diesel Exhaust Fluid (DEF)?

Diesel Exhaust Fluid (also known as AUS 32 and commonly referred to as AdBlue in Europe, Australia, and New Zealand) is a solution of solid urea dissolved in deionized water to produce a concentration that is 32.5% urea and 67.5% deionized water.

How DEF Works

Controlled amounts of the DEF solution are injected into the engine exhaust stream prior to the SCR catalyst. The temperature of the exhaust converts the urea in the DEF to ammonia. The ammonia and NOx in diesel exhaust react in the presence of the SCR catalyst to convert the NOx into nitrogen (N2) and water (H2O).

Typical properties of a DEF solution with 32.5% urea


PropertyTypical Value
pH9.5
Kinetic Viscosity at 25°C1.28 cSt
Surface Tension at 25°C65 mN/m, min.
Heat Capacity0.82 BTU/lb (°F)
Vapor Pressure Factor (relative to water)0.88

  • Caterpillar offers DEF in 2.5 gallon (9.5 liter) bottles for single use applications and in semi-bulk quantities 264 gallon (1000 liter) totes.
  • Any commercial DEF that meets the ISO 22241-1 specification is allowed for use in Cat® SCR equipped vehicles.