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Navajo Pumice

Pumicite, Volcanic Ash

Oxide Weight769.48
Formula Weight769.48
If this formula is not unified correctly please contact us.

pH (10% aqueous solution): 8.2
Hardness (Moh): 5.5-6.0
Index of Refraction: 1.5
Crushing Strength (lbs/sq in, one inch compaction): 990
Thermal Conductivity (K factor in BTU/hr/sq ft & 1 degree F/in): .63-.44
KNaO: 11.05

Formed by the tremendous pressure and heat of past geophysical activity, pumice is a natural compound of volcanic origin with practically limitless use in application extending from paint and chemical formulation to the cleaning of solid state electronic circuitry.

Navajo pumice, derived from deep, thick-bed deposits in New Mexico, is of the finest quality available. After removal from its bed, Navajo pumice is carefull selected to be free of impurities and mineral color stains. It is carefully ground to a near-white powder, analyzed and graded to meet a wide varity of uses.

When crushed it fractures into angular shapes with sharp cutting edges. When used as an abrasive it continues to fracture in use, thus constantly presenting new sharp edges to the work.

It is chemically inert and fire resistant and is an excellent additive for paints and other protective coatings. It can be used as a filtration media for chemical carrier. It is used in hand soaps and cleaners, glass cleaners, tooth polishes, facial scrubs, erasers, and in pottery as a filler and source of fluxing oxides.

It mixes and bonds well with a variety of materials, can be used as a soil substitute, filler, for compounding, and as a mold release agent.

Particle Size (US Standard Sieves):

Grade FFFF FFF FF F 0 0 1/2 0 3/4

80# 0.8 1.7 2.5
100# 1.6 1.4 3.8
120# 6.4 3.1 13.4
140# 0.6 11.9 25.6 18.5
170# 2.0 1.3 8.6 20.1 20.1
200# T T 3.0 6.7 7.4 18.0 13.8
325# 16.0 20.4 23.0 21.7 18.4 21.8 15.3

Density 48 47 45 45 44 37 36

Coarser grades are also available.

American Pumice Co, Box 4305, Santa Fe, NM 87502 505-471-9132

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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Navajo Pumice" descrip="Pumicite, Volcanic Ash" searchkey="" loi="0.00" casnumber="1332-09-8"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.440" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.170" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="5.500" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="12.520" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="74.200" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.620" tolerance=""/> </oxides> </material>

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