Designed for basing crown & bridge models. Pour into base former's without vibration for a bubble-free base. Out performs the strength of traditional base stones while giving a dense, smooth result. Low expansion rate producing accuracy. Indication for use: basing crown and bridge models. Color: Buff Setting Time: 9-11 Min Water/Powder Ratio: 23ml/100g Compressive Strength: 12,500psi Expansion: 0.08%