Pumice as a Functional Filler and Extender

Hess Pumice Products manufactures a line of micronized, non-hazardous amorphous silica products as functional fillers and extenders for paints, coatings, rubber, and plastics.

Non-Crystalline Silica (NCS) Functional Fillers

Because crystalline silica (CS) is now classified as a carcinogenic (and a cause of silicosis), manufacturers who have traditionally relied on an abundant supply of crystalline silica for their products are facing increasing pressures in regards to environmental concerns, health issues, and workplace rules.

Alternatives for CS have been few and often hard to source—until now. Hess Pumice produces a Non-Crystalline Silica (NCS) with all the beneficial features of CS without the health risks. Our product is an Amorphous Aluminum Silicate, including nearly 80% SiO2 (see Typical Chemical Analysis, below).

Our NCS products have a lower density than CS and cannot replace CS on a drop-in basis, rather, NCS must replace CS—or any other filler—on a volume basis, rather than by weight. This results in higher bulking values and higher yields per pound of NCS product verses CS product.

Gloss and sheen control with NCS is, in general, equal to and usually better than CS products. Hiding power can also be improved using NCS products. Additionally, NCS products work well as a replacement for Zeospheres in coatings.

Applications

Applications for the Hess Pumice Non-Crystalline Silica fillers include:
Industrial Coatings Rubber Compounds
Architectural Paints Plastics/Fiberglass Compounds
Wood Stains Silicones/Caulkings
Exterior Coatings Epoxies

Our Microfine (NCS) Pumice Products

Hess Pumice provides seven Non-Crystalline Silica products developed specifically as functional fillers for the paint/coatings and rubber/plastics industries. The grades are: NCS-3, NCS-5, NCS-8, NCS-10, NCS-12, NCS-15, and NCS-20 (with the numbers indicating the average particle size in micron). [DOWNLOAD NCS GRADE SPEC SHEETS]

Our amorphous aluminum silicate products are non-hazardous (crystalline silica free - to the detectable limit of .05%), inert, near white, pH of 7.2, with unit weights (loose) ranging from approximately 1.6 kg/gallon for the finer grades up to approximately 3 kg/gallon for the coarser grades.

Our NCS products provide outstanding scrub, burnish, and stain resistance properties due to the hardness of the particles (5.8 Mohs hardness).

Availability and Packaging

The Hess Pumice NCS products are shipped world-wide with standard packaging being in 20 kg poly-lined bags, 50 lb poly-lined paper bags, 500 kg bulk bags, and 2000 lb bulk bags.

Properties for Coatings

Hegman results start at approximately 5 for the coarser grades. Oil absorption ranges between 30% to 40% depending on the grade. These products are also known for their outstanding durability & weathering properties, including no known instance of frosting or chalking after several years exposed to the elements. NCS grades are also used in sheen control applications.

Hegman 5 to 8
Oil Absorption % 34 to 40
Bulking Value 0.05
Moisture less than one percent

Hess NCS: Chemical Analysis & Properties

TYPICAL CHEMICAL ANALYSIS GENERAL PHYSICAL PROPERTIES
SiO2: 76.2% pH: 7.2
AI203: 13.5 Radioactivity: 0
H2O: < 1.0 Softening Point: 900 degrees C
K2O: 1.8 Mohs: 6
Na2O: 1.6 Crystalline SiO2: None Detected
FeO: 0.1 HMIS: 0
CaO: 0.8 GE Brighteness 84
MgO: 0.05    
TiO2: 0.2    

REQUEST A SAMPLE OF OUR NCS or to talk to a pumice expert

Call for a sample of the brightest and hardest Amorphous Aluminum Silica commercially available in the world. It is near-white in color, neutral in pH, non-toxic, non-hazardous and has great hardness for outstanding durability and low oil consumption.

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

•SALES: If you need to talk availability, grades or grade blends, logistics, costs...contact Mike Hess Jr., Sales Manager, at extension 147 or email salesmgr@hesspumice.com

•RESEARCH: Perhaps you are exploring the possibilities—thinking pumice may fit your particular filler extender 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

Alternatives for CS have been few and often hard to source—until now.

paintingThe Hess micronized amorphous silica NCS products impart outstanding durability and weathering properties and will not frost or chalk beneath the assault of the elements.

DOWNLOADS

burnish-resistant paint Adding specially-developed Hess NCS fillers to paint adds bulk and increases burnish and abrasion resistance with little compromise in brightness—our NCS pumice filler is the whitest commercially available (84 on the GE brightness scale). industrial coatings 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