Oleum (Latin oleum, meaning oil), or fuming sulfuric acid, is a term referring to solutions of various compositions of sulphur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid). Oleum is identified by the CAS number 8014-95-7.

CAS Number: 8014-95-7
UN Number: 1831
Hazard Class: 8
Packing Group: I
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Photo of Oleum