E552: Calcium silicate

What is E552?

E552 is calcium silicate, a fine white mineral powder made of calcium, silicon and oxygen. It is highly porous and absorbs moisture and oil, which helps keep powders dry and free-flowing.

Origin and production

Food-grade calcium silicate is produced synthetically, typically by reacting a calcium source such as lime with silica (silicon dioxide) under controlled conditions. Related calcium silicate minerals also occur naturally.

Why is it used?

Its main role is as an anti-caking agent, preventing powdered and granulated products from forming lumps. It is found in drink powders, seasonings and condiments, table salt, sugars, dietary supplement powders and some snacks.

Vegan, vegetarian and halal

E552 is mineral in origin and suitable for vegans and vegetarians. It raises no particular halal or kosher concerns.

Safety and regulation

Calcium silicate is authorised as a food additive in the European Union for specific uses. In its 2018 re-evaluation of silicate additives, EFSA highlighted gaps in the available data and recommended further information; it is also permitted in other jurisdictions such as the United States.

Common in