Walnut Shells (Versatile Soft Abrasive Media) Applications and Uses

Walnut shells are a versatile abrasive media widely used in blasting, tumbling, cleaning, polishing, filtration, cosmetics, as well as non-skid applications and filler applications.

Walnut shells are crushed, ground and classified to standard mesh sizes that range from coarse grits to fine powders.

This article provides an overview of walnut shell uses and applications.

Characteristics of Crushed Walnut Shells

Figure 1. Walnut shell blasting media

 

Walnut shell media (Figure 1) is an all-natural, biodegradable, durable material with excellent strength characteristics. It has a specific gravity of 1.2-1.4 and a hardness of 3.5 MOH and 91 Rockwell.

Walnut shell performs well in a variety of pH and temperature conditions and are resistant to fermentation. They are reusable and reclaimable and thus serve as a suitable blast media in outdoor applications. Composition Materials has supplied walnut shell products globally for over 60 years.

Walnut Shell Blasting

In walnut shell blasting, wheel blast or air blast equipment is used to remove paints and coatings from buildings, cars, boats, furniture, fiberglass, steel, etc.

Walnut shell blasting offers the aggressiveness required to remove hard paints and coatings without damaging substrates. The process also enables selective coating removal, wherein the top coating can be removed without affecting the underlying coatings.

In blast operations, a number of factors are involved and they include safety, nozzle distance, media particle size, and p.s.i. Walnut shell blasting does not cause silicosis and hence provides a perfect alternative to sandblasting.

Walnut Shells for Deflashing, Polishing & Tumbling

Walnut shells are also used to deflash parts, as well as for tumbling and polishing brass, metal, plastics and hard rubber. In tumbling applications, a polishing compound is often mixed with the walnut shells.

 

Walnut Shell Fillers

 

Figure 2. Walnut shell flour

Ground walnut shell grits and flours are made for the construction, furniture, adhesives, paint, plywood, resin, rubber, paint and cosmetic industries. For anti-slip applications, ground walnut shell serves as a suitable additive for stairs, decks, pools, floors, and ramps. In addition, walnut shell flour is a preferred additive in rubber and plastics compound manufacturing. Moreover, walnut shells are employed in burn-out applications to improve porosity in ceramics.

Walnut Shells in Cosmetics

Walnut shells are used in a variety of body and bath products, hand soaps and scrubs. This all-natural, biodegradable ingredient is an excellent microbead replacement and has been used in cosmetic formulations for over 30 years. Cosmetic services include sterilization and custom packaging.

About Composition Materials

Since 1923, Composition Materials has been an industry leader in supplying Abrasives, Blast Media, Non-Skid Media, Deflashing Media, Fillers & Extenders, UV Masking Resins and Natural Cosmetic Ingredients.

Many of the company’s products are manufactured from recycled and sustainable sources. Composition Materials has a large network of worldwide distributors throughout North America, South America, Europe, Australia, New Zealand, and the Pacific Rim.

Composition Materials

This information has been sourced, reviewed and adapted from materials provided by Composition Materials.

For more information on this source, please visit Composition Materials.

Comments

  1. Alan Clarke Alan Clarke New Zealand says:

    How is a half walnut shell sterilized?

  2. Kathryn Joslin Kathryn Joslin Australia says:

    I have a walnut tree, who wants to buy my shells?

    • Teresa Johnson Teresa Johnson United States says:

      Sell them on eBay, Amazon and Etsy

  3. Tord Sigmund Aamodt Tord Sigmund Aamodt Norway says:

    You really did good work here. Thanks for spreading solid information!

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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