Superior Quality Pumice

An industrial materials company can be very good at what they do—competitive pricing, logistical expertise, consistency on spec, innovative and efficient production methods—but without a quality product, the high ground simply can’t be held. And while we pride ourselves on all of the above...we also count ourselves fortunate that our pumice deposit is world-class.

Over 70-percent of our processed pumice is exported into countries and regions that often have domestic pumice sources nearby—because our customers require a superior quality pumice product.

Worldwide, our pumice enjoys advantages in whiteness (GE brightness of 84), hardness (Mohs’ scale 5.8), density (specific gravity of 2.35 g/cc) and natural purity. Our deposit has a confirmed yield in the millions of tons. Three modern processing facilities and a state-of-the-art testing lab ensure we can consistently deliver to the ordered specification.

Key Features of Hess Pumice

bulletSpecialized impurity extraction technologies, combined with the natural characteristics of the deposit, allow for extremely high purity content (98% - 99.8%, depending on grade)

bulletLow unit weight (40 - 50lbs per cubic foot, depending on grade)

bulletConsistent MOHS of 6

bulletSuperior friability characteristics

bulletReported abrasive benefits of 25% - 50% over all other available pumice worldwide

bulletNear white color useful in many filler applications and decorative concrete applications

bulletFOB pricing consistently the lowest in industry (depends on grade) due to advantageous economies of scale and tight logistics control

bulletLarge warehouse and unsurpassed processing capability allow for rapid response to customers’ needs

bulletCustom blending available to meet the most exacting customer specifications

bulletPumice, due to its amorphous characteristics, is not considered a health risk to the workers who handle it. (See downloadable Safety Data Sheets in the page sidebar.

bulletWe can help customers secure economic freight rates from our location (Freight Collect)

bulletConfirmed source pumice reserves yield in the millions of tons

Ongoing Testing for Quality Assurance

Hess Pumice is continuously testing our product to ensure superior quality. Among the most common tests that we perform in-house are:

bulletSieve Size Analysis (ASTM C-136)

bulletParticle Size Analysis by Laser Diffraction (ASTM B822-10)

bulletWhiteness (Datacolor “Check” method)

bulletHeavy Minerals Analysis

In-House Test Method: Split sample 25 to 50 grams and shake for 10-20 minutes on Ro-Tap type sieve shaker. Use standard 8-inch U.S. Mesh testing sieves.

We also submit product samples to outside laboratories for third-party verification in the following areas:

bulletBacteria plate count

bulletChemical analysis

bulletBulk density

We adhere to a strict inspection policy and are compliant with all ISO 9000/2008 standards.

Every lot of product (maximum of five pallets) is tested a minimum of two times during the production process with samples being retained for at least one year. All quality and sales records are retained electronically as well as in hard-copy form.

We go to great lengths to ensure customer satisfaction in both our product and the entire purchasing experience.

Hess Pumice Mine in southeast Idaho USA The Hess pumice mine.

Physical Properties

Chemical Name: Amorphous Aluminum Silicate
Hardness (MOHS): 6
pH: 7.2
Radioactivity: none
Loss on Ignition (LOI): 5%
Softening Point: 900 degrees C
Water Soluble Substances: 0.15%
Acid Soluble Substances: 2.9%
Reactivity: Inert
Appearance: white powder (GE brightness of 84)

Chemical Analysis (typical averages)

Silicon Dioxide: 76.2%
Aluminum Oxide: 13.5%
Ferric Oxide: 1.1%
Ferrous Oxide: 0.1%
Sodium Oxide: 1.6%
Potassium Oxide: 1.8%
Calcium Oxide: 0.8%
Titanium Oxide: 0.2%
Magnesium Oxide: 0.05%
Water: <1.0%

PUMICE GRADES

We have over 300 pumice grades available and stock over 30 common pumice grades, ready to ship anywhere in the world. We also work closely with customers needing custom grades or grade blends. For information on custom grades please call our sales manager at (208) 766-4777 x 147 or email: sales@hesspumice.com

REQUEST A PUMICE SAMPLE

•We have provided an online sample request form to expedite the processing and delivery of your pumice sample.

TALK TO A PUMICE EXPERT

Perhaps you are exploring the possibilities—thinking pumice may fit your particular need, thinking you’d like to run some tests—then we invite you to contact Brian Jeppsen, VP Research and Development, at (208) 766-4777 x111 or email: rd@hesspumice.com

 

Prove us in your own lab: contact us for samples.

pumice stoneThe Hess pumice deposit is world-class in purity and brightness.

DOWNLOADS

test sample pumice powder The various pumice grades we produce are continuously sample-tested in our lab to insure specifications are consistently met. Hess Pumice Testing Lab Quality Assurance Pumice Testing 208.766-4777  •  Malad City, Idaho 83252
sales@hesspumice.com
HESS POZZ and HESS ULTRAPOZZ
ASR MITI•GATOR™ (FLATLINES ALKALI-SILICA REACTION IN CONCRETE)
ULTRAFINE POZZOLANIC CEMENTITIOUS GROUT
HESS PERLITE
HESS ’PONICS (PUMICE GROW MEDIA)
LIMESTRONG (PLASTER & MORTAR PRODUCTS)
THE IDEAL FLY ASH REPLACEMENT
PUMICE AND CONCRETE
MICROBEAD REPLACEMENT
ABOUT PUMICE