Fumed silica (also called pyrogenic silica) is 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:
Specific Surface Area (BET):
Bulk Density, Loose:
Bulk Density, Packed:
Oil Absorption (Gardner-Coleman):
138 g oil per 100 g pigment
pH Value (4% solution):
Moisture Content (maximum) (ASTM C 323-56 or C 234-82):
Loss on Ignition (ASTM C 323-56):
Silicon Dioxide (SiO2):
Health and Safety
WARNING: The product contains crystalline silica - quartz, which can cause silicosis (an occupational lung disease) and lung cancer.
Natural Pigments is a limited liability company based in Willits, California. We manufacture and distribute rare and hard-to-find materials for fine artists and decorators. We specialize in supplying artists' materials that were used in historical painting since pre-historic times up to and including the nineteenth century.
We constantly search for materials and products of the finest quality so that we can bring them direct to you from the source. To do so, we travel the world to find materials specifically for use by professional artists and decorators. We obtain minerals from mines in Afghanistan, Chile, Russia, Ukraine and Uzbekistan, to name a few places, processing these into natural pigments. We purchase resins, gums and plants from India, Kenya and Malaysia to make natural varnishes and painting mediums.
Our mission is to provide the largest variety of natural pigments, paints and other professional artists' supplies, enabling us to bring you a selection that makes shopping for rare and hard-to-find art materials easy. Our objective is to promote the education and use of these materials among artists by providing detailed information for their employment in encaustic, fresco, oil, watercolor and tempera painting.
This product is shipped from our warehouse in Gretna, NE, USA.
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
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