Home › Chemicals › Pyridine CAS 110-86-1: Pyridine (C5H5N) Identity CAS Number 110-86-1 Molecular Formula C5H5N IUPAC Name pyridine Molecular Weight 79.1 g/mol SMILES c1ccncc1Synonyms azine, pyridin, nitrogen benzene
2D Structure
Physical Properties Density 0.982 g/mL at 25°C Boiling Point 115.2°C Melting Point -41.6°C Flash Point 20.0°C Vapor Pressure 2.0 kPa at 20°C Refractive Index nD = 1.509 Dielectric Constant ε = 12.4
Safety & GHS Classification Flammable GHS06 Health Hazard
H225: Highly flammable liquid and vapor H302: Harmful if swallowed H311: Toxic in contact with skin H331: Toxic if inhaled H370: Causes damage to organs (nervous system, liver) Storage: Store in cool, well-ventilated area. Very unpleasant odor detectable at <1 ppm. Use in fume hood. Keep away from strong acids and oxidizers. Chronic exposure causes liver and nervous system damage.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Poor PE Good PP Good PEEK Excellent PVDF Good
Rubbers Material Rating Viton Poor NBR Poor EPDM Poor Silicone Poor FKM Poor
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Good Brass Good
Applications Pharmaceutical synthesis (sulfonamides, vitamins) Solvent for organic reactions Reagent in Karl Fischer titration Pesticide intermediate Denaturant for industrial alcohol Rubber and textile chemical Catalyst in acylation reactions External References: PubChem
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