E552 (calcium silicate) — What It Is, Foods Containing It, Safety Profile

E552 is the EU food-additive code for calcium silicate (CAS 1344-95-2). It functions in food as a anti-caking agent. This page indexes publicly-available regulatory and encyclopaedic data so consumers reading an ingredient label can quickly look up what they're seeing — and verify each fact at the linked primary source.

Sources: EFSA · Wikidata (Q416365) · Wikipedia · last fetched 2026-06-03

What E552 is

calcium silicate is the substance assigned EU food-additive code E552. In the EU regulatory framework, E-numbers are codes for substances that have been evaluated for use as food additives (Regulation (EC) No 1333/2008 on food additives, with the European Food Safety Authority performing safety re-evaluations). The same substance carries different identifiers in other jurisdictions — for example, the US FDA refers to substances by their chemical name and CAS number in its Food Substances database; Codex Alimentarius uses INS (International Numbering System) numbers which usually match EU E-numbers.

• CAS Registry Number: 1344-95-2
• Molecular formula: Ca₂O₄Si

What it does in food

E552 is used as a anti-caking agent — meaning it is added to dry products (powders, salts) to keep particles separate and free-flowing.

Looking it up on a label

On EU food labels E552 may appear as the E-code, as the plain name calcium silicate, or by a synonym — all three are legally equivalent under EU labelling rules (Regulation (EU) No 1169/2011 on food information to consumers). The CAS number 1344-95-2 uniquely identifies the substance in chemical databases, including the US FDA Substances Added to Food inventory.

Where you'll find it

Examples of products in our index whose declared ingredient list contains E552 or calcium silicate. Click through for the full label and any safety flags we've cross-referenced against EU and US regulator databases:

• Roasted Garlic & Peppers — Club House
• Instant mashed potatoes, butter & herb — Roundy's
• Top Ramen, Ramen Noodle Soup, Chicken — Nissin
• Potato chips, dill pickle
• Drink Mix, Grape — Giant Eagle
• Soup Mix — Schnucks
• Drink mix, pink lemonade
• Fish & Seafood Seasoning — Raley's
• Mesquite Grilling Seasoning Spice Grinder — Raley's
• Pinch of rome seasoning spice grinder — Raley's

Typical food categories where E552 appears include those permitted under Annex II of Regulation (EC) No 1333/2008 — the full per-category permission list is searchable in the EU food-additive database.

Regulatory status

• European Union: assigned E-number E552, which means the substance has been evaluated and listed under Regulation (EC) No 1333/2008. Specific permitted food categories and maximum levels are in Annex II of the same regulation. Re-evaluations are published in the EFSA Journal.
• United States: the FDA does not use E-numbers; the substance status (GRAS, food additive petition, prior-sanctioned, colour additive) can be checked in the Substances Added to Food database by name or CAS.
• Codex Alimentarius (international): uses INS numbers which usually match EU E-numbers. Codex GSFA (General Standard for Food Additives) at fao.org/gsfaonline.

Safety review history

EFSA's Panel on Food Additives and Flavourings (FAF) — and its predecessor, the ANS Panel — periodically re-evaluates approved food additives. To read the most recent published opinion on E552 (calcium silicate), search the EFSA Journal. The opinion will state whether an Acceptable Daily Intake (ADI) has been set, whether existing exposure estimates are within that ADI, and whether any restrictions or further data are recommended.

ProductGuru indexes publicly-published regulatory data. We do not summarise or paraphrase safety conclusions — please read the EFSA opinion directly, since regulatory language is precise and context-dependent.

Other additives with the same role

Other E-numbers ProductGuru indexes that are listed as a anti-caking agent are tagged anti-caking-agent on this site. Browse to compare common alternatives food manufacturers use for the same role.

If you have a food sensitivity or allergy

Whether E552 is appropriate in your personal diet depends on your specific medical situation — for example, certain colourings carry mandatory EU label warnings about possible effects on activity and attention in children (Regulation (EC) No 1333/2008, Annex V), some preservatives have been associated with reactions in sensitive individuals, and some additives are not suitable for specific dietary requirements. This page does not provide medical or dietary advice. Please talk to a registered dietitian or your doctor about specific dietary concerns or suspected reactions to a food additive. If you've had an acute allergic reaction, contact emergency care.

Verify these facts on the primary register

• Verify on EFSA →
• EU food-additive database (per-category permissions) →
• Wikidata entry (Q416365) →
• Wikipedia article →
• US FDA Substances Added to Food →
• Codex Alimentarius GSFA →

Disclaimer. This page indexes publicly-published food-additive data sourced from Wikidata (CC0), with regulatory deep-links to EFSA, the EU food-additive database, the US FDA, and Codex Alimentarius. This is NOT medical advice. Talk to your doctor or a registered dietitian about specific dietary concerns or allergies. We do not recommend any particular dietary action based on the information on this page — please verify each claim directly with the linked primary source before acting on it.