What is E515?

Potassium sulfate (US) or potassium sulphate (UK), also called sulphate of potash (SOP), arcanite, or archaically potash of sulfur, is the inorganic compound with formula K2SO4, a white water-soluble solid. It is commonly used in fertilizers, providing both potassium and sulfur. E515 sits in the E500–E599 series, which in the EU classification mainly covers acidity regulators and anti-caking agents.

What is E515 used for?

E515 belongs to the stabilisers group. Stabilisers keep mixtures even and stop ingredients separating. Most are safe.

Is E515 safe?

E515 is considered safe at the levels used in food and is approved for use in the EU. “Safe” means it is approved in the EU and regarded as safe at the levels used in food.

How E515 appears on labels

On food packaging you'll find E515 either as the number “E515” or by the name “Potassium sulphates” in the ingredient list, often after its function. Ingredients are listed in descending order by weight, so an additive near the end is present only in small amounts.

Is E515 vegan?

Yes, E515 is suitable for vegans.