CAS Number:50‑00‑0
Synonyms:Formaldehyde; Methanal; Formalin (37–40% aqueous); Methylene oxide
Chemical Formula:CH₂O
Molecular Weight:30.03 g/mol
Product Introduction
The simplest aldehyde, typically handled as colorless aqueous formalin (37–38%) with pungent odor. Essential in resin production (urea‑, phenol‑, melamine‑formaldehyde), tissue preservation, disinfection, and as a chemical intermediate. Known human carcinogen.
| Property | Value |
|---|---|
| Appearance | Colorless gas or aqueous solution |
| Odor | Pungent; threshold ~0.5–1 ppm |
| Density (liquid) | ~1.09 g/mL at 25 °C (37%) |
| Melting Point | –15 to –19 °C |
| Boiling Point | Pure: –19.5 °C; 37% solution: ~97 °C |
| Vapor Pressure | ~52 mm Hg (37 °C) |
| Refractive Index (n₂₀ᴅ) | ~1.377 |
| Solubility | Fully miscible with water and organics |
| Vapor Density | ~1 × air |
| Explosion Limits | 7–73 vol % |
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