Table 2.

Nano-silica properties.

Item	Unit	Quality
Appearance	-	High-dispersive white powder
Hear reduction	%	≤3
Ignition loss	%	≤6
SiO2	%	≥99.8
Specific surface area	m2/g	100 ± 25
pH value	-	6.5–7.5
Surface density	g/mL	≤0.15
Dispensability (CCl4)	%	≥80
Oil-absorbed value	mL/100 g	≥250
Average particle size	nm	10−25
Hydrophobicity	-	Strong