Practice question

What is the chemical composition and freezing point of AdBlue (AUS 32 / Diesel Exhaust Fluid) standardized under ISO 22241?

  1. 32.5% high-purity synthesized urea and 67.5% demineralized water; it freezes at $-11.5^°C$
  2. 50% methanol and 50% distilled water; freezes at $-40^°C$
  3. 100% pure liquid ammonia; freezes at $-77^°C$
  4. 10% sulfuric acid in water; freezes at $0^°C$

Answer: A — 32.5% high-purity synthesized urea and 67.5% demineralized water; it freezes at $-11.5^°C$

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