Fumed Silica

SKU: NAP-510-18FSIL01
Out of stock
Out of stock
Unit Price
US$ 21.60
Out of stock
Processing time
Usually ships the next business day.

Fumed silica (also called pyrogenic silica)

A hydrophilic silica with a specific surface of 200 square meters per gram. Fumed silica has a chain-like particle structure that bonds together to trap liquid, thereby increasing the viscosity. Add to thicken and increase the transparency of paint. Stirring or brushing paint containing fumed silica will cause it to flow, but when stopped, the paint will 'thicken up' again. This property is called ‘thixotropy’.

Average Primary Particle Size: 12 nm
Specific Surface Area (BET): 200 m2/g
Bulk Density, Loose: 30 g/L
Bulk Density, Packed: 50 g/L
Oil Absorption (Gardner-Coleman): 138 g oil per 100 g pigment
pH Value (4% solution): 3.7–4.7
Color: White
Refractive Index: 1.48–1.50
Moisture Content (maximum) (ASTM C 323-56 or C 234-82): 1.5%
Loss on Ignition (ASTM C 323-56): 1.0%
Chemical Analysis
Silicon Dioxide (SiO2): 99.8%
Health and Safety

WARNING: The product contains crystalline silica - quartz, which can cause silicosis (an occupational lung disease) and lung cancer.

Shipping from
This product is shipped from our supplier's warehouse in Willits, CA, United States
Our guarantee
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
A 25% handling charge is levied against all authorized returns except those due to our error. Unauthorized returns are subject to a 40% handling charge. Damages & defects must be reported to us within 14 days.
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