A super hard, type 4 die stone formulated especially for use with CAD/CAM systems. Sarros Slate Stone has an extended working time thereby enabling the pouring of multiple cases. With low expansion and high compression strength, this is the ideal choice for all of your CAD/CAM restorations. Sarros 2.0 Slate Stone provides excellent reproduction of detail, dimensional stability, edge strength and is resistant to abrasion and fracture. Because it is an all natural gypsum, there is no problem with stability and has a much longer shelf life compared to synthetic die stones. Compatible with many types of impression materials available in the market today. Water to powder ratio: 20ml / 100g • Working time: 6-7 mins • Initial Set Time: 12-14 mins Expansion rate: 0.09% after 2h • Compressive strength: 60 MPa after 1 hour and 90 MPa after 24 hours