Nobilium CB30 Investment Material 150x 100g Powder + 3L LiquidMade for use with ceramic gold, semi precious, and nonprecious crown & bridge alloys, CB 30 is a high heat, oxy phosphate investment with a refined grain. This carbon free grain, combined with its temperature immune liquid binder, allows for controlled expansion and yields smooth castings. One of the features of CB 30 is its ability to cast most alloys without the need for a ring. Its high strength also contributes to improved casting surface finish