Home › Chemicals › Lactic Acid CAS 50-21-5: Lactic Acid (C3H6O3) Identity CAS Number 50-21-5 Molecular Formula C3H6O3 IUPAC Name 2-hydroxypropanoic acid Molecular Weight 90.08 g/mol SMILES CC(O)C(=O)OSynonyms 2-hydroxypropanoic acid, milk acid, lactic acid, DL-lactic acid
2D Structure
Physical Properties Density 1.206 g/mL at 25°C Boiling Point 122.0°C Melting Point 16.8°C Flash Point 110.0°C Vapor Pressure 0.03 kPa at 20°C Refractive Index nD = 1.439 Dielectric Constant ε = 22.0
Safety & GHS Classification GHS05 Irritant
H302: Harmful if swallowed H315: Causes skin irritation H318: Causes serious eye damage Storage: Store in a cool, dry area. Hygroscopic — absorbs moisture from air. Keep container tightly sealed. Store away from strong bases and oxidizers. Stable at room temperature in sealed containers.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Excellent NBR Good EPDM Excellent Silicone Good FKM Excellent
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Fair Brass Fair
Applications Food preservative and acidity regulator (E270) Biodegradable plastic (PLA) production Cosmetic and skincare ingredient (AHA) Pharmaceutical intermediate Textile finishing agent Metal cleaning and etching Leather tanning Medical suture manufacturing External References: PubChem
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