H&W Investment Material (20kg Powder + 3Ltr Special liquid) H&W Phosphate- Bonded Investment is a fine grain phosphate investment, which mainly used for partial-dentures, framework, dental holder, bridges and Co-Cr Alloy Casting COMPOSITION – Crystalline Silica Quartz Crystalline Silica Cristobal Monoammonium Phosphate Features – Have a Fine Particle Size to give smooth surface on the casting. Easily manipulated with enough working time. Have Enough strength at room temperature to permit ease in handling. Have enough strength at higher temp. to withstand impact force of the molten metal. Break away easily from the surface of the metal With stand high temperature without decomposing time Key Specifications – Best use temperature : 21-25 degree C Powder / Liquid Ratio : Powder : Liquid = 100g:23 ML Mixing Time : 60 sec in Vac Operate Time: about 4-5 miuntes Final Setting Time: about 4–60 minutes Expansion rate: The Expansion rate of Phosphate bonded investment material may be adjusted by altering the ratio of expansion liquid to water.