Home › Chemicals › Propylene Oxide CAS 75-56-9: Propylene Oxide (C3H6O) Identity CAS Number 75-56-9 Molecular Formula C3H6O IUPAC Name 2-methyloxirane Molecular Weight 58.08 g/mol SMILES CC1CO1Synonyms 1,2-epoxypropane, methyloxirane, PO
2D Structure
Physical Properties Density 0.859 g/mL at 25°C Boiling Point 34.0°C Melting Point -112.0°C Flash Point -37.0°C Vapor Pressure 59.0 kPa at 20°C Refractive Index nD = 1.366 Dielectric Constant ε = 6.3
Safety & GHS Classification Flammable GHS05 GHS06 Irritant
H220: Extremely flammable gas H302: Harmful if swallowed H314: Causes severe skin burns and eye damage H331: Toxic if inhaled H336: May cause drowsiness or dizziness H350: May cause cancer H412: Harmful to aquatic life with long lasting effects Storage: Store as compressed liquid. Extremely flammable — use explosion-proof equipment. Suspected carcinogen. Handle in well-ventilated area with full PPE. Keep away from ignition sources, acids, and bases.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Poor PE Good PP Good PEEK Excellent PVDF Good
Rubbers Material Rating Viton Fair NBR Severe Effect EPDM Severe Effect Silicone Poor FKM Fair
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Good Brass Good
Applications Polyurethane polyol production (60% of demand) Propylene glycol production Glycol ether manufacturing Chemical intermediate Fumigant Petroleum demulsifier Hydraulic fluid component External References: PubChem
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