Which of the following is a die hardener: (A) Cyanoacrylate., (B) Potassium sulphate., (C) Sodium chloride., (D) Resin
Answer is A. Die hardeners arc materials used to reinforce the surface of a die so as to make it more resistant of abrasion and scratching.
Die hardeners used with gypsum dies:
• Cyanoacrylate
• Silver plating
• Addition of die hardeners to gypsum