Which of the following is used as surface hardener in Impression material ?

Correct answer: A. 2% Potassium sulfate

  • A. 2% Potassium sulfate
  • B. 0.2% Potassium sulfate
  • C. 2% sodium sulfate
  • D. 4% Potassium sulfate

Explanation

A 2% potassium sulfate solution is used as a surface hardener for some impression materials, particularly to improve the surface hardness of the cast. The concentration is important, making the other potassium sulfate options unsuitable.

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