Preparation of Magnesia Insulation Materials by Calcination of Walnut Shell Powder by Silica Sol Impregnation

Table 4

Normal temperature performance of the sintered samples.

Properties	Ws10	Sws10	Sws15	Sws20
Total porosity (%)	64.45	64.09	68.17	70.17
Apparent porosity (%)	53.17	47.78	52.54	56.83
Close porosity (%)	11.28	16.31	15.63	13.34
Bulk density (g/cm^3)	1.226	1.257	1.146	1.029
Linear shrinkage (%)	1.8	2.2	3.7	4.8
Compressive strength (MPa)	12	18	13	7