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Excalibur Die Stone from Garreco is made out of ultrafine gypsum base that eliminates dents and abrasions caused by brittleness. The material changes colors to indicate when it is completely mixed, creating a smooth, uniform mixture. Ideal for crown and bridge and partial denture models and works well with all impression materials. Do not use with gypsum hardeners Fast setting time 18,000 psi and 0.09% expansion 22/100 water to powder ratio