Y-fb gfb40 gfb42 gfb45
Al2o3(%)min. 40 40 42 45
Fe2o3(%)max. 2.5
Refractoriness()min. 1710 1730 1750 1750
Refractoriness under load 0.2mpa()min. 1300 1350 1400 1400
Apparent porosity(%)max. 22 20 20 20
Cold crushing strength (mpa)min. 30 30 35 40
Linear change after reheating(%)max.
At 1350 2h +0.1
-0.4
At1400x3h +0.1 +0.1 +0.2
- 0.5 -0.4 -0.2.