Table 4. Density profile of ceramics according to the carbonization temperature

Carbonization temperature (°C)	Dave (kg/m3)	Dmin (kg/m3)	Dmax (kg/m3)	Dmin/Dave (%)
600	696	581	943	83.6
800	819	679	1,047	83.0
1,000	858	724	1,137	84.4
1,200	795	702	1,065	88.2

D_ave: average of density, D_min: minimum of density, D_max: maximum of density, D_min/D_ave: minimum of density to average of density ratio.