A super hard, natural, type 4 stone with high strength and low expansion. Because Gold Stone is a natural gypsum there is no problem with stability and has a long shelf life when compared to synthetic die stones. Its thixotropic properties allow it to flow smoothly yet it can be stacked. This product can be used in any application where a quality die stone is needed. Water to powder ratio: 20ml / 100g • Working time: 6-7 mins • Initial Set Time: 12-14 mins • Expansion rate: 0.09% after 2 hours • Compressive strength: 60 MPa after 1 hour and 90 MPa after 24 hours