Refractory product with refractoriness is over 1,750oC. Many size and shaped of products are available. We are pleased to enclose the specification as follow: Chemical composition 1. SiO2, (%), < 55 2. Al¼2O3, (%), > 37 3. Fe2O3, (%), < 1.7 4. CaO, (%), < 1 5. MgO, (%), < 0.2 6. K2O, (%), < 1.5 7. Na2O, (%), < 0.5 Physical properties 1. Refractoriness, (oC), > 1,750oC 2. Heat resistance 950oC û air, > 11 times
