Description
Fumed Silica (also called pyrogenic silica) is a hydrophilic silica with a specific surface area of 200 square meters per gram. Fumed silica has a chain-like particle structure that bonds to trap liquid, increasing viscosity. Add to thicken and increase the transparency of the paint. Stirring or brushing paint containing fumed silica will cause it to flow, but the paint will ‘thicken up’ again when stopped. This property is called ‘thixotropy’.
| Properties | |
| Physical Properties | |
| Color: | White |
| Physical Appearance: | Light powder |
| 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 |
| 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% |
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