Schottlander System Stone Extra is a high strength stone Type 4 in accordance with EN ISO 6873:2000. Schottlander System Stone Extra has all the benefits of System Stone, but with the added advantages of greater hardness and a thixotropic formula which enables the flow of the stone to be controlled. It is suitable for use with all die stone systems, being extremely detailed, possessing low setting expansion and being resistant to chipping. This material is designed for production of precision dies and master models especially as part of a die stone system. Shades available: Ivory, Peach and White