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Silicon Dioxide (E551) - Silica Explained

Silicon Dioxide (SiO2, E551) is a naturally occurring inorganic compound widely used in food, pharmaceutical, and industrial applications as an anti-caking agent and carrier substance.

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Things worth knowing about "Silicon Dioxide"

Silicon Dioxide (SiO2, E551) is a naturally occurring inorganic compound widely used in food, pharmaceutical, and industrial applications as an anti-caking agent and carrier substance.

What is Silicon Dioxide?

Silicon Dioxide (chemical formula: SiO₂), also known as silica, is one of the most abundant inorganic compounds on Earth. It occurs naturally in minerals such as quartz, sand, and flint. In the food industry, it is approved as a food additive under the designation E551, where it functions primarily as an anti-caking agent.

Uses in the Food and Pharmaceutical Industry

Silicon Dioxide serves several important functional roles across multiple industries:

Food industry (E551): Used as an anti-caking agent in powdered products such as spices, instant soups, baking powder, and table salt to prevent clumping
Pharmaceutical industry: Acts as a glidant and carrier in tablets and capsules to improve powder flow during manufacturing
Cosmetics: Used as a thickening and opacifying agent in creams and toothpaste
Industrial applications: Used in semiconductors, glass production, and surface coatings

Forms of Silicon Dioxide

Amorphous vs. Crystalline

Silicon Dioxide exists in two main structural forms: amorphous (non-crystalline) and crystalline. The amorphous form -- including synthetic variants such as fumed silica and silica gel -- is used in food and pharmaceutical applications and is considered safe at regulated levels. The crystalline form, primarily as quartz, poses significant health risks when inhaled as fine dust, and is associated with the occupational lung disease silicosis and lung cancer.

Nano-Sized Particles

Synthetically produced Silicon Dioxide can occur as nano-SiO2 (nanoparticles). The long-term health effects of oral exposure to nano-sized silica particles are currently under scientific investigation. The European Food Safety Authority (EFSA) conducted a re-evaluation of E551 in 2018 and called for further research specifically addressing nanoparticle forms.

Safety and Health Assessment

In its 2018 re-evaluation, the EFSA concluded that amorphous Silicon Dioxide (E551) is safe at current permitted levels of use. The acceptable daily intake (ADI) was classified as "not specified," indicating that no health risk is expected under normal consumption conditions. However, the authority recommended additional studies on nano-sized particles to clarify any potential risks.

Amorphous SiO2 as a food additive (E551) is considered safe by regulatory authorities
Inhalation of crystalline silica dust is strongly linked to silicosis and lung cancer
Nano-SiO2 remains under scientific review regarding long-term oral safety

Permitted Levels and Regulation

Within the European Union, Silicon Dioxide (E551) is approved for use in a range of food categories. Maximum permitted levels vary by product type and typically range between 10,000 and 50,000 mg/kg of the finished food product. Its use is continuously monitored by the European Commission and EFSA. In the United States, it is classified as Generally Recognized as Safe (GRAS) by the FDA.

References

European Food Safety Authority (EFSA): Re-evaluation of silicon dioxide (E 551) as a food additive. EFSA Journal, 2018. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5088
U.S. Food and Drug Administration (FDA): GRAS Notice Inventory - Silicon Dioxide. https://www.fda.gov/food/food-additives-petitions/food-additive-status-list
Rowe R.C., Sheskey P.J., Quinn M.E.: Handbook of Pharmaceutical Excipients, 6th Edition. Pharmaceutical Press, 2009.

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