Class IV synthetic gypsum for the preparation of models in skeletal prosthetics and removable prosthetics. Excellent handling due to its good flow and appropriate viscosity. Setting time is 14 minutes. Very low expansion at 2 hours of 0.08%. Compressive strength and expansion resistance. Class IV synthetic gypsum for model preparation. Excellent handling due to its good flow and appropriate viscosity. Setting time is 10 minutes. Expansion 0.08%. Class IV plaster for model preparation. Good flow and viscosity. Setting in 10 minutes. Expansion 0.08%.