The Natural Material that Fills and Extends
Sustainable
Affordable
Renewable
Leaders in the Fillers & Extenders Industry
Walnut shells are used as fillers or extenders in everything from paint and coating materials to resins and livestock feed. Our in-house raw material stock guarantees a consistent, high-quality supply without interruption.
Custom Grades
We custom-produce and tailor sizing for all filling and extending needs
Fits Your Process
We will work with you to supply sample product for research and development
Key Benefits
Our walnut shells are not chemically processed, have no heavy metals, and are asbestos-free
Get a Free Sample Kit
For a free sample kit of our in-stock walnut shell, just submit your info below.
Get My KitHow Walnut Shells Improve Your Formulation
Readily Available
Annually renewable, your walnut shell applications are protected from supply chain bottlenecks
Versatile and Long Lasting
Walnut shells can be added to pigments, plastics, adhesives, ceramics, and more
Various Sizes Available
Media sizes vary from coarse walnut shell to walnut shell flour
Looking for Walnut Shell in Smaller Quantities?
Now available on Amazon, our walnut shell media is prime for those needing a material for fillers and extenders on a smaller scale.
Shop NowEco-Shell FAQs
Learn the answers to some of the most common questions we receive about using walnut shells for a variety of industries.
We grow and process English walnut shells at our local California farms.
Yes, we have years of experience shipping globally. Contact us for more information.
All our shells come from local California farms and are grown to meet the highest standard in the country.
Product benefits include being reach exempt, all-natural, non-GMO, pesticide-free, asbestos-free, and having no heavy metals.
Have a Project Walnut Shells May Be a Fit For?
Our In-Stock Filler Size Options
Our sizes are based on U.S sieve standards. Millimeter and inch measurements are approximate. We offer smaller sizes for adhesives, plastics, and rubbers, as well as larger sizes for pin cushions, toys, and decorative plastics.
4/6
3.35 mm 0 4.75 mm0.1320 in – 0.1870 in
6/10
2.00 mm – 3.35 mm0.0787 in – 0.1320 in
6/20
0.85 mm – 3.35 mm0.0331 in – 0.1320 in
8/12
1.70 mm – 2.36 mm0.0661 in – 0.0937 in
12/20
0.85 mm – 1.70 mm0.0331 in – 0.0661 in
14/30
1.40 mm – 0.66 mm0.0234 in – 0.0555 in
18/40
0.425 mm – 1.00 mm0.0165 in – 0.0394 in
20/40
0.425 mm – 0.85 mm0.0165 in – 0.0331 in
-100
95% passing 100.150 mm, .0059 in