CAS#: 29943-42-8 Synonyms: tetrahydro-2H-pyran-4-one Molecular formula: C5H8O2 Boiling point: 166-166.4 Flash point: 56C Appearance: colorless transparent liquid Assay: 98.5% min. Standard: enterprise standard Water solubility: MISCIBLE Refractive index: 1.451-1.453