Calcium Oxide E529
processing aid, pH adjuster — Primarily mineral-derived.
Calcium oxide (CaO)
CAS: 1305-78-8
Factual Regulatory Reference
This database provides factual regulatory information compiled from official government sources. It does not constitute medical, nutritional, or safety advice. Regulatory status varies by country and is subject to change. Always refer to your local regulatory authority for the most current information.
? Did You Know?
Beyond food, Calcium Oxide is also used in cosmetics, medicine, industrial applications, household products. Its versatility makes it one of the most multi-purpose chemical compounds in everyday life.
In the EU, Calcium Oxide has a "quantum satis" authorization — Latin for "as much as needed." This means there's no specific maximum limit; manufacturers use only what's technologically necessary.
Detailed Regulatory Assessment
European Union (EFSA)
Used as processing aid; typically hydrated to calcium hydroxide upon contact with moisture in food.
Official EFSA LinkUnited States (FDA)
Limited use; typically converts to calcium hydroxide in food applications.
Japan (MHLW)
Compliant with Japanese food sanitation law.
Acceptable Daily Intake (ADI)
International Standard (JECFA)
mg/kg body weight per day
European Standard (EFSA)
Natural Occurrence
This additive is not known to occur naturally in significant quantities.
Manufacturing
Produced by heating limestone (calcium carbonate, CaCO3) to very high temperatures (above 825°C) in a lime kiln. This drives off carbon dioxide, leaving calcium oxide. When water is added, it becomes calcium hydroxide (slaked lime).
Applications Beyond Food
Rarely used.
Rarely used directly; converted to calcium hydroxide for pharmaceutical use.
Steel manufacturing, cement production, glass manufacturing, paper production, water treatment.
Historical use in lighting (limelight), hot packs (exothermic reaction with water).