Insulating Firebrick: 1.Grade: 23,26,28,30 2.Size:230x114x64mm ... equipment,hot blast stove,heating furnace, tunnel kiln,shuttle kiln,glass-pool kiln,tec Standard SpecificationGrade: 23,26,28,30Classification temperature ... production is also available. For more information,please contact us ! Insulating Firebrick ( high temperature insulation)