Rice Husk Filled Polymer Composites

Table 5

Properties of RHA silica and commercial silica [44].

Properties	RHA silica	Commercial silica
Average particle size (micron)	4.27	6.61
Specific surface area (m^2 g^−1)	131.35 ± 2.34	511.97 ± 4.70
Bulk density (g cm^−3)	0.677	0.319
pH	5.7	6–8
Oil absorption (g g^−1)	1.92	2
Silica content (% SiO2)	99.6	99.0