Guarantee\Brand	MLTJ—85	MLTJ—80
MgO (%)≥	85	80
Al2O3(%)≥	3	3
Fe2O3(%)≤	5	7.5
SiO2 (%)≤	1	2
Apparent Porosity (%) ≤	16-17	16-17
B·D (g/cm3)≥	2.95	2.95
Room temperature compressive strength (MPa) ≥	45	55
0.2MPa load softening starting temperature (oC) ≥	1680	1650
Thermal shock resistance 1100oC water (times) ≥	7	8
Thermal conductivity 1000oC (w / m.k)	2.5	2.5
Thermal expansion 1200oC (%)	0.9	0.9