Why does Natriumchlorid not have an E-number while Calciumchlorid does?

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Dear European Food Safety Authority,

Under the right of access to documents in the EU treaties, as developed in Regulation 1049/2001, I am requesting documents which contain the following information:

Why does Natriumchlorid not have an E-number while Calciumchlorid does, what is the difference in the context of e-numbers?

Yours faithfully,

Per Andersen