CAS 64-18-6: Formic Acid (CH2O2)
Identity
| CAS Number | 64-18-6 |
| Molecular Formula | CH2O2 |
| IUPAC Name | methanoic acid |
| Molecular Weight | 46.03 g/mol |
| SMILES | OC=O |
| Synonyms | methanoic acid, hydrogen carboxylic acid, formylic acid, HCOOH |
2D Structure
Physical Properties
| Density | 1.22 g/mL at 25°C |
| Boiling Point | 100.8°C |
| Melting Point | 8.4°C |
| Flash Point | 69.0°C |
| Vapor Pressure | 4.2 kPa at 20°C |
| Refractive Index | nD = 1.371 |
| Dielectric Constant | ε = 58.0 |
Safety & GHS Classification
GHS05GHS06
- H314: Causes severe skin burns and eye damage
- H331: Toxic if inhaled
Storage: Store in acid-resistant containers. Corrosive — handle with PPE. Can decompose to CO — do not heat in sealed containers. Keep away from strong oxidizers.
Material Compatibility Matrix
Plastics
| Material | Rating |
|---|---|
| PTFE | Excellent |
| PVC | Fair |
| PE | Good |
| PP | Good |
| PEEK | Excellent |
| PVDF | Good |
Rubbers
| Material | Rating |
|---|---|
| Viton | Fair |
| NBR | Severe Effect |
| EPDM | Good |
| Silicone | Fair |
| FKM | Fair |
Metals
| Material | Rating |
|---|---|
| Stainless 316 | Good |
| Aluminum | Poor |
| Copper | Poor |
| Brass | Poor |
Applications
- Leather tanning (30% of production)
- Silage preservative for animal feed
- Descaling agent and cleaner
- Beekeeping (miticide against Varroa mites)
- Chemical intermediate
- Pharmaceutical synthesis
- Fuel cell hydrogen carrier
- Rubber coagulant
External References: PubChem