Product Information CAS number 75-07-0, 107-02-8 EC index number 605-003-00-6 EC number 200-836-8 Hill Formula C₂H₄O Chemical formula CH₃CHO Molar Mass 44.05 g/mol HS Code 2912 12 00 Applications Application Acetaldehyde for synthesis. CAS No. 75-07-0, EC Number 200-836-8. Physicochemical Information Boiling point 20.4 °C (1013 hPa) Density 0.78 g/cm3 (20 °C) Explosion limit 4 - 57 %(V) Flash point -38.89 °C Ignition temperature 140 °C Melting Point -123.5 °C pH value 5 (H₂O, 20 °C) Vapor pressure 1202 hPa (25 °C)