| Appearance | White to off-white crystalline solid |
| Boiling Point | 225–230°C at 15 mmHg (reduced pressure) |
| Melting Point | 231–233°C (lit.) |
| pH | 5–7 (10 g/L aqueous, 20°C) |
| Molecular Formula | CH3NH2·HCl (CH6ClN) |
| Molecular Weight | 67.52 g/mol |
| SMILES String | CN.Cl |
| CAS Number | 593-51-1 |
| Storage Class | 11 |
| EC Number | 209-795-0 |
| Water Solubility | Highly soluble; hygroscopic |
| MDL Number | MFCD00012849 |
| PubChem CID | 6364545 |
| InChIKey | NQMRYBIKMRVZLB-UHFFFAOYSA-N |
| RTECS Number | PA0603000 |
| Applications | Pharmaceutical API/intermediate synthesis (N-methylated drug intermediates) |
Methylamine hydrochloride is the white crystalline salt formed when methylamine gas is neutralized with hydrochloric acid (CH3NH2·HCl, CAS 593-51-1). This locks the normally pungent, gaseous amine into a stable, low-volatility solid, far more practical for weighing, storage, and shipment than the parent gas.
Used as a methylamino-group building block in API and drug-intermediate synthesis, and equivalently in agrochemical active manufacturing. Also used in specialty catalyst, rubber, and dye/surfactant intermediate chemistry, and — more recently — as a precursor in perovskite solar cell material research.
