Castable refractry is special type material for high heat places, like furnaces and klins. It made to handle extreme hot without break down. Greatsun Aopeng is brand that make high-quality castable refractory product. These mix with water make paste you can pour into molds. When it hardens it form strong heat-resist structure. Castable refractory very important in industries such metalworking, ceramics, glass making. It help keep heat where needed and protect other stuff from damage. For applications in ceramics, consider using Calcined Aluminas for Ceramics to enhance performance.