Imprep AC Putty Soft Fast Set (Bright Yellow) Set Contains: 1 x 450g each putty base & catalyst, 2 mixing spoons. Hydrophilic addition cured vinyl polysiloxane impression material with advanced hydrophilic properties. Two part silicone elastomer cures by polyaddition reaction at room temperature. Features excellent detail reproduction and low linear shrinkage. No release of toxic substances both during and after curing. Resistant to inorganic chemicals and UV rays. Advanced hydrophilic properties decrease the risk of reproduction inaccuracy due to saliva. Ideal for putty/wash technique.