Table 2.
Effect of steaming time and species of sawdust on total porosity

Species of sawdust	Steaming time (min)	Total porosity (%)
Pine sawdust	0	68.1 ± 0.9 b*
	10	68.1 ± 1.6 b
	20	69.4 ± 0.5 b
	30	73.8 ± 0.7 a
Oak sawdust	0	82.5 ± 1.2 c
	10	85.2 ± 1.0 b
	20	86.0 ± 1.0 b
	30	88.9 ± 2.0 a

Mean separation within columns each species by Duncan’s multiple range test at p = 0.05