Fossil Shell Flour

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Why is it called Fossil Shell Flour®?

We use this name to differentiate our products from all other diatomaceous earth products available in the market. Amorphous diatomaceous earth from our deposits is ground until it reaches flour texture. Hence the name Fossil Shell Flour®, flour made of fossilized diatom shells. No two diatomaceous earths are the same. Our diatomaceous earth originates from deposits of fossilized shells of diatoms Melosira Preicelanica which lived in extremely pure fresh water.


Why is this type of diatoms so special?

Its shell is built of amorphous silica. The shape and hardness of the shells affect the quality of the Fossil Shell Flour®. Hardness of the shells prevents them from dissolving in fluids. Holes in the shell walls ensure that they absorb moisture. As a result our flour may be used as anti-caking agent.

What is the difference between diatomaceous earth from fresh water deposits and from salt water deposits?

Fresh water deposits, such as our one, have got stable content of diatoms. Fossilized shells preserve their original tube shape. This shape and resistance of fossilized shells are crucial for the effectiveness of the Fossil Shell Flour®.

Our deposit contains 89%-95% of amorphous silica SiO2. This deposit is uniquely pure and contains stable volumes of other elements that were deposited together with diatoms. Fresh water deposit is related to outflow of water from the surrounding environment. Fresh water deposits in the mountains, like our one, were created as a result of melting of very clean snow. Melted snow was a source of water in which diatoms later lived. Salt water deposits, in turn, contain a mixture of various types of diatoms of varied shape, and fossilized shells are brittle and break easily. Therefore they cannot be used for our purposes. Composition of salt water deposits is less predictable than the fresh water ones.


What is the difference between amorphous earth and crystalline silica?

Amorphous silica SiO2 occurring naturally is a rare mineral variety that is necessary to every mammal on our planet. Silica changes its form to crystallized form in higher temperatures with volcanic activity or as a result of industrial activities of humans.

Diatomaceous earth containing crystalline silica is used in filtration systems, for example in swimming pools. Fine-crystalline silica is very dangerous when it is breathed in or when it is in the digestive system, as it is not biodegradable.

Diatomaceous Earth Fossil Shell Flour®:

  • originates from high purity fresh water deposit
  • meets the requirements of the Food Chemical Codex and may be used in food industry
  • inflammable, non-toxic
  • contains less than 1% of crystalline silica – smallest level of all known deposits
  • safety scale according to the Hazardous Materials Identification System (HMIS) (0 – safe, 4 – dangerous): health – 0; flammability – 0; toxicity – 0
  • CAS No. 61790-53-2
  • WE No. 612-383-7 100
Amorphous FSF silica was certified as safe food product by Codex Alimentarius. Codex Alimentarius, literally translated from Latin means “food code”, contains both general and specific standards ensuring food safety. Its purpose is protection of consumers’ health and guarantee of using fair practices in the food industry. Food marketed locally or exported must be safe and of good quality. More in English.

Food-grade amorphous FSF Diatomaceous Earth has been certified by:

  • EPA (US Environmental Protection Agency) – as a safe insecticide against crawling insects for indoor and outdoor use
  • EPA (US Environmental Protection Agency) – as a safe addition to grains to control mealworm and other pests
  • USDA (United States Department of Agriculture) – as an anti-caking agent used in animal feed
  • FDA (Food and Drug Administration) – as a food grade product for external and internal use
Among 600 of the US deposits, only four are of food grade according to standards of the FDA. Other food grade deposits may contain higher volumes of sediment and clay elements which make them less effective.

Depending on their origin, some deposits may contain clay elements in volumes sufficient to block the pores of fossilized shells. In such case, the effectiveness of diatomaceous earth is seriously limited.

We have conducted numerous analyses of deposits other than those of food grade to compare them, and they are a proof that diatomaceous earth in our products originates from the purest fresh water sources.

We also hold certificates confirming that our diatomaceous earth is a food grade product.


  1. Karta Charakterystyki Ziemi Okrzemkowej FSF
  2. Oświadczenie Zarządu Perma-Guard o naturalnym pochodzeniu Ziemi Okrzemkowej
  3. Tłumaczenie Oświadczenia Zarządu Perma-Guard o naturalnym pochodzeniu Ziemi Okrzemkowej
  4. Certyfikat Amerykańskiego Instytutu Badawczego Materiałów Organicznych OMRI 2012
  5. Certyfikat Amerykańskiego Instytutu Badawczego Materiałów Organicznych OMRI 2013
  6. Certyfikat Amerykańskiego Instytutu Badawczego Materiałów Organicznych OMRI 2014
  7. Certyfikat Amerykańskiego Instytutu Badawczego Materiałów Organicznych OMRI 2015
  8. Rozporządzenie Ministra Zdrowia w sprawie dozwolonych substancji dodatkowych

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