Our specially formulated Anorthite-Mulite K23 brick 1300 classification temp & extra-light K26 brick 1400 classification bricks.
 
These are some of the most insulating bricks on the market with remarkably low conduction & weight!
K23: 1300 classification temp, 0.2w/mk at 1000C, density 0.5g/cm^3, CCS: 1, MOR: 0.8 
K26: 1430 classification temp, 0.26w/mk at 10000c, density 0.7g/cm^3, CCS: 2.2, MOR: 1.5