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Our pumice is a near-white used to polish surfaces on wood, and added to chalk and gesso grounds to give it tooth.

Our pumice is a near-white, milled volcanic glass that has many uses in fine arts. Add pumice to paint to give it a matte appearance 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 matte 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. Our pumice products are 100% natural materials. No synthetic chemicals or other materials are added during mining or processing. The superior properties of our pumice products result from both the unique high purity, low-density pumice deposit and the exacting process procedures.

Typical Physical Properties
Medium Grade Fine Grade
Partile Size Range 0.04 to 0.2 mm (80 to 325 Mesh) 80% finer than 44 microns (325 Mesh)
Reflectance (green filter) 80 80
Refractive Index 1.5 1.5
pH (10% in water) 9 9
Specific Gravity 2.13 2.22
Bulk Density, lbs/cu ft 41 48
Hardness, Mohs 5.5 5.5
Moisture, % < 1 < 1
Oil Absorption 45 g oil / 100 g 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 Medium Grade Fine Grade
% Retained % 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
325 0.0017 44 20
Pan < 0.0017 < 44 80
Total 100% 100%
More Information
BrandRublev Colours
VendorNatural Pigments
Processing TimeUsually ships the next business day.
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