Pumice Grades and Types

We produce processed, mine-grade and non-crystalline silica (NCS) pumice products for industry worldwide.

Our modern processing plants allow us to produce a pumice grade to fit any application. And our rigorous product testing ensures it meets the application spec every time.

NOTE: Typical production turnaround for most pumice grades is two weeks. Please plan accordingly.

If the standard grades listed below don’t fit your needs, we’ll work up a custom grade to meet your specifications.

Pumice (Processed Grades)

Standard
Grade
Weight
per Bag (lbs)
Bags
per Pallet
Pallet
Weight (lbs)
-325 45 48 2160   | Download this Grade Spec
FFFF 45 48 2160   | Download this Grade Spec
FFF 45 48 2160   | Download this Grade Spec
FF 45 48 2160   | Download this Grade Spec
F 50 48 2400   | Download this Grade Spec
1/0 45 48 2160   | Download this Grade Spec
2/0 45 48 2160   | Download this Grade Spec
3/0 45 48 2160   | Download this Grade Spec
0 50 48 2400   | Download this Grade Spec
0 1/2 45 48 2160   | Download this Grade Spec
0 3/4 45 48 2160   | Download this Grade Spec
1/2 45 48 2160   | Download this Grade Spec
1 - 1/2 45 48 2160   | Download this Grade Spec
2 40 48 1920   | Download this Grade Spec
3 40 48 1920   | Download this Grade Spec
4 40 48 1920   | Download this Grade Spec
5 35 54 1890   | Download this Grade Spec
7 35 54 1890   | Download this Grade Spec
10 35 54 1890   | Download this Grade Spec
5/16C 75 24 1800   | Download this Grade Spec
1 x 3/4 75 24 1800   | Download this Grade Spec
Download Additional Grade Spec Sheets (50+ available)

Pumice (Mine Grades)

Grade Approximate
Unit Weight
Notes:
1" x 3/4" 1300 lbs/CY   | Download this Grade Spec

1) All mine products are sold on a per-ton basis.

2) Loading hours are Monday through Friday 8:30 a.m. - 3:30 p.m.

3) Pumice, on a per-ton basis, will yield approximately 2.3 times the volume of sand or gravel.

4) Products can be loaded bulk in trucks or rail cars.

5) Call 1-800-767-4701 x147 for more information. Get driving directions.

3/4" x 3/8" 1300 lbs/CY   | Download this Grade Spec
7/16" 1550 lbs/CY
3/8 x #8 1400 lbs/CY   | Download this Grade Spec
3/8" – 1550 lbs/CY   | Download this Grade Spec
1/8" – 1600 lbs/CY   | Download this Grade Spec
Pit Run 6" 1550 lbs/CY

Pumice (NCS Grades)

Our Non-Crystalline Silica (NCS) product (an amorphous aluminum silicate) was developed in response to environmental and health concerns with Crystalline Silica (CS) and provides an effective replacement for CS, Minex® and SafSil® in industrial coatings, paints, stains, rubber compounds, plastics and fiberglass.

Grade Weight
per Bag (kg)
Bags
per Pallet
Pallet
Weight (kg)
NCS-3 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-5 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-8 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-10 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-12 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-15 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000
NCS-20 20 48 960
25 42 1050   | Download this Grade Spec
500 2 1000

REQUEST A PUMICE SAMPLE

•We have provided instructions on a sample request page to expedite the processing and delivery of a sample of the brightest and hardest amorphous aluminum silica (pumice) commercially available in the world.

bulletContact Us: (208) 766-4777 x147 •  sales@hesspumice.com

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Hess Pumice offers processed, mine-grade and non-crystalline silica (NCS) pumice products to industry.

pumice processing plant interiorAt Hess Pumice, we take our "on-spec" promise seriously, as evidenced with our use of an inline Malvern Insitec system to deliver continuous particle size analysis.

DOWNLOADS

micrograph of finely crushed (micronized) pumice powder Micrograph of finely crushed pumice magnified 50 times. Pumice retains its effective, functional characteristics even when processed to a sub-micron size. standard pumice particle sizes testing pumice powder for grade spec 208.766-4777  •  Malad City, Idaho 83252
sales@hesspumice.com
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