Phyllite Schiefer

Phyllite Schiefer is a rock flour which is registered under the name natrolite-phonolite. The product is registered as a technological additive (E566) under the subgroup binders, anti-caking agents and coagulants. It is a natural product which originates from lava-type rock. The product contains high levels of magnesium silicate and has a fibrous crystal structure.

Because of its properties, the product surrounds particles, resulting in a better flow (free flowing). This is the case, for example, in silos or bunkers containing flour products. The product has been approved for all animal categories and can be supplied in different particle sizes, from fine powder to fine granulate.

ProductPhyllite Schiefer
TypeGS 024 (PLUS)/50/100/130/200
Registration numberE566
FormPowder and granulate
Pellet binder-
Moisture binding-
Gastrointestinal retarder+
Free-flowing agent++
Toxin control-
NH4+ binding-
Nutrient supplier -

Poortershaven: Know-how

Poortershaven continuously develops new applications for the use of clay and rock minerals in the agricultural sector. This has resulted in well-known and frequently used products for animal health, soil improvement and animal bedding hygiene.

The colour of the products may differ in real life, due to the sharpness and screen settings. If desired, we would be happy to send a sample.

Broad product portfolio

Poortershaven offers a wide range of products. This means that within a product range you will always find a form that suits the intended use and/or technical installation.

Continuously innovating

We collaborate with universities and research institutes, among others, to test our products and their applications and to generate knowledge about optimal use.

Product knowledge

Through long-term relationships with our suppliers, we supply reliable and stable products. Along with our suppliers, we have a lot of in-house specialist product knowledge.


We know our products and would be happy to get in touch with you. We are happy to share our knowledge about our products with you, enabling us to jointly find an appropriate solution for your problem.


If you have any questions about our range, prices or current stock, if you would like advice, or if you would simply like to touch base with us, please contact us.

We look forward to assisting you.

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For more information and current prices, please feel free to contact one of our employees.

Call +31(0)10 4365755 or mail