SK30	SK32	SK34	K43
Pyrometric Cone Equivalent	Orton Cone	29 – 30	31 – 32	33 – 34	33 – 34
Refractoriness	°C	1,670	1,715	1,760	1,760
Bulk Density	kg/m3	2,140 – 2,150	2,200 – 2,250	2,235 – 2,250	2,275 – 2,285
Apparent Porosity	%	19.0 – 20.0	18.0 – 19.0	17.0 – 18.0	17.0 – 18.0
Cold Crushing Strength	kg / cm2	220-250	220-320	300-350	350 – 400
Modulus of Rupture	kg / cm2	55 – 70	55 – 70	60 – 80	80 – 90
Reheat Test. Permanent Linear Change After Heating at 1.400 ° C	%	0.0 to – 0.06	0.0 to – 0.2	– 0.18	– 0.5

		SK30	SK32	SK34	K43
Pyrometric Cone Equivalent	Orton Cone	29 – 30	31 – 32	33 – 34	33 – 34
Refractoriness	°C	1,670	1,715	1,760	1,760
Bulk Density	kg/m3	2,140 – 2,150	2,200 – 2,250	2,235 – 2,250	2,275 – 2,285
Apparent Porosity	%	19.0 – 20.0	18.0 – 19.0	17.0 – 18.0	17.0 – 18.0
Cold Crushing Strength	kg / cm2	220-250	220-320	300-350	350 – 400
Modulus of Rupture	kg / cm2	55 – 70	55 – 70	60 – 80	80 – 90
Reheat Test. Permanent Linear Change After Heating at 1.400 ° C	%	0.0 to – 0.06	0.0 to – 0.2	– 0.18	– 0.5