BASE INFORMATION
Pumice Grades and Types
Hess Pumice produces a wide range of pumice grades for industrial processes and consumer products. Three processing plants allow us to produce a variety of grade and grade blends. Production capability combined with six-plus decades of expertise means we can provide a pumice product to meet almost any need.
ON SPEC. ON TIME. We engage rigorous product testing measures to ensure each grade meets application spec. Every time. Our logistical experience in moving pumice world-wide means we can deliver pumice where it needs to be when it needs to be there.
CUSTOM GRADES. If one of the common standard grades listed below don’t fit the need, we also have several specialized grades that may work. If not, we’ll work up a custom grade to meet the specifications.
PRODUCTION TURNAROUND. Typical production turnaround for most pumice grades is two weeks. Please plan accordingly.
PUMICE STORAGE. Keep stock dry and protected from the elements until use.
Processed Pumice Grades
| STANDARD GRADES AND PACKAGING | |||
| HP GRADE | LBS / BAG0000 | BAGS / PALLET | LBS / PALLET0 |
 F |
45 | 48 | 2400 |
| FF |
45 | 48 | 2160 |
| FFF | FFFD |
45 | 48 | 2160 |
| FFFF |
45 | 48 | 2160 |
| -325 (HessPozz) |
45 | 48 | 2160 |
| 0 |
45 | 48 | 2160 |
| 0•1/2 | 0•1/2D |
45 | 48 | 2160 |
| 0•3/4 | 0•3/4D |
45 | 48 | 2160 |
| 1/0 |
45 | 48 | 2160 |
| 2/0 |
45 | 48 | 2160 |
| 3/0 | 3/0N |
45 | 48 | 2160 |
| 3/0B |
25 | 72 | 1800 |
| 1/2 | 1/2N |
45 | 48 | 2160 |
| 1 |
45 | 48 | 2160 |
| 1•1/2 |
45 | 48 | 2160 |
| HP GRADE | LBS / BAG0000 | BAGS / PALLET | LBS / PALLET0 |
| 2 | 2S |
40 | 48 | 1920 |
| 3 |
40 | 48 | 1920 |
| 5 |
35 | 54 | 1890 |
| 7 |
35 | 54 | 1890 |
| 10 |
35 | 54 | 1890 |
| 8/12B |
45 | 48 | 2160 |
| 10 Heavies |
2000 | 1 | 2000 |
| 3/8 x #8 |
50 | 36 | 1800 |
| 5/16C |
50 | 36 | 1800 |
| 3/4 x 3/8 |
50 | 36 | 1800 |
| 3/4 x 5/16 |
50 | 36 | 1800 |
| 1 x 3/4 |
50 | 36 | 1800 |
Pumice Mine Grades
Our mine grades are typically comprised of 98% pumice and 2% other igneous minerals, which are not removed through our mining processes. Mine grades are available in palletized supersacks or bulk loaded into trucks/rail cars.
| MINE GRADES AND PACKAGING | |||
| HP GRADE | LBS / BAG0000 | BAGS / PALLET | LBS / PALLET0 |
| 1/8 Fines MN |
2000 | 1 | 2000 |
| 3/8 Fines MN |
2000 | 1 | 2000 |
| 3/8 x #8 MN |
2000 | 1 | 2000 |
| 3/4 x 5/16 MN |
2000 | 1 | 2000 |
| HP GRADE | BULK LOAD | ||
| Mine grades are also sold on a per-ton basis. LOADING HOURS: Monday thru Friday, 8:30 am – 3:30 pm. NOTE: Pumice, on a per-ton bulk basis, will yield approximately 2.3 times the volume of sand or gravel. Product can also be trucked from the mine and loaded in rail cars at our plant terminal. | |||
| 1/8 Fines MN |
1600 lbs/cubic yard | ||
| 3/8 Fines MN |
1550 lbs/cubic yard | ||
| 3/8 x #8 MN |
1400 lbs/cubic yard | ||
| 3/4 x 5/16 MN |
1300 lbs/cubic yard | ||
| 3/4 x 3/8 MN |
1300 lbs/cubic yard | ||
| 7/16 MN | 1550 lbs/cubic yard | ||
| 1 x 3/4 MN |
1300 lbs/cubic yard | ||
Micronized Pumice Grades
Our Non-Crystalline Silica (NCS) ultrafine grades were 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. Pumice is an amorphous (no crystalline structure) aluminum silicate. But it is the distinctive, sponge-like structure that make the Hess NCS grades more than mere fillers—the frothy particles fully integrate and mesh into the polymer networks of various coatings, resulting in a much more functionally useful, reinforced pigment than is possible with typical platey extenders.
| NCS GRADES AND PACKAGING | |||
| HP GRADE | LBS / BAG0000 | BAGS / PALLET | LBS / PALLET0 |
| NCS-3 |
50 | 42 | 2100 |
| NCS-5 |
50 | 42 | 2100 |
| NCS-8 |
50 | 42 | 2100 |
| NCS-10 |
50 | 42 | 2100 |
| NCS-12 |
50 | 42 | 2100 |
| NOTE: Grade name numbers represent average particle size (in microns). | |||
