Yeso IFB low density means the lower thermal storage, fast heating and cooling, ... Application from 900C to 1650C in 6-grade, Mullite Insulating Fire BrickThis product family consists of four groups, A series, B ... include standard shape brick, special shape brick, Mortar, and accessory products.Features: 1) Low iron oxide. 2) Low thermal conductivity.3) Low density, shorter heat ...