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Pumice (Medium) 4 oz vol

SKU: NAP-510-13PUM04
The minimum order amount for this product line is $30.00
Pumice (Medium) 4 oz vol
Discount table
Qty Price
 1   US$ 5.78 
 2   US$ 5.75 
 3   US$ 5.73 
 4-5   US$ 5.71 
 6-7   US$ 5.69 
 8-11   US$ 5.68 
 12+   US$ 5.66 
Price: US$ 5.78
US$ 5.78

Product description

Our pumice is a near-white, milled volcanic glass that has many uses in fine arts. Add pumice to paint to make it appear mat when dried, to add texture and to increase body without tinting the color. Pumice can also be added to grounds to give it "tooth" and as an abrasive to smooth and polish substrates and grounds.

This grade of white pumice is used to polish surfaces such as wood, and added to chalk and gesso grounds to give it tooth. This grade of pumice is white so it will not discolor grounds. Use this grade to add fine texture to paint and to give it a matt appearance.

Pumice is formed when lava from an erupting volcano flows onto the earth's surface and cools. The comparatively low atmospheric pressure at the surface results in the sudden release of steam and other dissolved gases from the still molten mass, thereby producing bubbles. This creates the pocked appearance familiar in "lava rock" used for gas grill briquettes and landscape rock. Pumice deposits are only found within a few miles of ancient volcanoes.

Our pumice is from a deposit located in Espanola, New Mexico. The ore is mined from open pits and then transported to the plant where it is crushed, milled and dried. It is then processed through a modern classification system to produce a rigorously controlled and consistently uniform product.

Typical Physical Properties
Reflectance (green filter) 80
Refractive Index 1.5
pH (10% in water) 9
Specific Gravity 2.4
Weight per Solid Gallon, lbs 20.0
Bulking Volume, gal/lb 0.5
Apparent Bulk Density, lbs/cu ft 44.0
Hardness, Mohs 5.5
Moisture, % <1
Oil Absorption 45 g oil / 100 g
Typical Chemical Analysis
Compound % by Weight
Silicon Dioxide (SiO2) 75
Aluminum Oxide (Al2O3) 12
Phosphate (K2O) 4
Sodium Oxide (Na2O) 4
Iron Oxide (Fe2O) <2
Calcium Oxide (CaO) <2
Magnesium Oxide (MgO) <2
Titanium Dioxide (TiO2) <2
Sieve Analysis
Size No. Opening Inches Opening Microns % Retained
80 0.0069 177
100 0.0058 149
120 0.0049 125
140 0.0041 105
170 0.0035 88
200 0.0029 74 <1
325 0.0017 44 10-25
Pan >0.0017 >44 75-90
TOTAL 100%


Reflectance (green filter): 80
Refractive Index: 1.5
pH: 9
Weight Per Gallon: 20.0
Bulk Density: 0.5
Apparent Bulk Density: 44.0
Hardness: 5.5
Moisture: <1
Oil Absorption: 45 g oil / 100 g

Natural Pigments

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.
All Natural Pigments products

Product weight: 0.25 lbs

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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Pumice (Medium Grade) (4 oz vol)

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