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Which advantage does silicon carbide offer?

  • A.Lower cost, which is why it is used for the majority of the filters fitted to passenger vehicles today
  • B.Nothing
  • C.Greater tolerance of the temperature reached during an uncontrolled regeneration, together with better heat conduction
  • D.A higher melting point and better thermal conductivity

Answer: D

Silicon carbide survives the temperature excursions that destroy cordierite. The last option explains exactly that advantage, which makes it a correct and more instructive version. It is considerably more expensive. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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