Type-IV, high-strength die material that provides optimum expansion for making crowns and bridges, porcelain, and a high scrape resistance. Forms a glassy-smooth, chip-resistant surface. No hardeners or additives are needed. Water/powder ratio:21 mL/100 Gm. (25 Lb. and 50 Lb. cartons)12.6 mL/60 Gm. (24 envelopes x 60 Gm.)25 mL/120 Gm. (24 envelopes x 120 Gm.)