Walnut shells have become a popular by-product because of their versatility and all-natural benefits. They are highly porous, non-toxic, and biodegradable, which makes them a very attractive product for a range of industries. From fuel and water filtration to polishing and blasting, walnut shells offer a variety of advantages. Depending on their usage, walnut shells can be crushed into granules or flour, which makes it a very adaptable product.

Even though walnut shells are predominantly used within industrial and commercial industries, they can be advantageous for craft makers alike. The outer shell has a unique aesthetic appeal due to its natural shape and colour, which can add an interesting touch to any product or craft project. Although the appearance of the shell can interest many, what are the main characteristics of walnut shells that make them so valuable?

In this blog post, we are going to cover the attributes and qualities of walnut shells, and what makes them so popular for the industries stated above.  Walnut shells are a fantastic by-product of walnut processing, and here is why…

Types of Walnut Shell

When walnut shells are produced, two common types are used: the standard-grade English walnut shell and the filtration-grade Black walnut shell. In botanical terms, these are known as juglans regia and juglans nigra.

Here at Eden, our walnut products are manufactured from standard-grade English walnuts, which offer a range of benefits for many industrial and pet applications. Although English walnut shells are predominantly used for culinary purposes, they are also utilised in furniture, millwork and construction. English walnuts are much softer and thinner than Black walnuts, which means they can be used in a wider range of industries. For example, the softer texture of the English walnut means it can be used in cosmetic products such as soaps and exfoliants, as it is non-toxic and naturally abrasive.

When looking at the physical qualities, walnut shells are incredibly robust and durable, with a hardness of 3.5-4.00 on the Mohs (mineral hardness) scale. Due to its hardness, the shell is commonly used as a natural and eco-friendly solution for sandblasting and cleaning. They also perform incredibly well in a variety of pH levels and temperatures, which contributes to their overall versatility.

Walnut Shell Granules Are Used For:

  1. Polishing and deburring applications – used to clean metal alloys, jewellery, mechanical and automotive parts, and shell cartridges.
  2. Blasting media for metals, wood, plastic, stone, and fibreglass. Due to its soft nature, it will not scratch or damage the surface material.
  3. Filtration to remove grease, oils, and solids from chemical plants and refinery water streams.
  4. Walnut flour can replace mineral fillers in paints, resins, adhesives, and coating materials.
  5. Acts as a natural abrasive in soaps and body scrubs, that offers many benefits for the skin.
  6. Used for animal bedding and reptile substrates, as a dust and chemical-free alternative.

When compared to other materials, walnut shells are also relatively inexpensive and can be easily purchased in bulk at a great price. Here at Eden, we supply high-quality English walnut shell products, which are sourced and supplied from Europe and the USA. All of our products can be bought in bulk to meet the needs of your requirements. We also offer a bespoke contract packing service, where you can acquire any of our free-flowing materials in a box, sack, or bucket. As one of the UK’s leading suppliers of 100% biodegradable media, you can rely on us for top-quality products. If you’re interested in our walnut shell products or any of our other natural goods, please contact us today and our team will be more than happy to help.

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