... , In Application from 900C to 1650C in 6-grade, Mullite Insulating Fire BrickThis product family consists of four groups, A series, B ... thermal and physical requirements. Product forms include standard shape brick, special shape brick, Mortar, and accessory products.Features: 1) Low iron oxide ... face lining.5) General high temperature insulation YESO Light Weight Insulating Fire Brick-YK28