Yeso IFB low density means the lower thermal storage, fast heating and cooling, In Application from 900C to 1650C in 6-grade, Mullite Insulating Fire BrickThis product family consists of four groups, A series, B series, C series, and YK series, applicable to work environment ranging from 800 to 1, 760 Celsius Degrees. Each grade is manufactured to meet specific thermal and physical requirements. ...