| Property | Specification | Test Method |
|---|---|---|
| Appearance | Clear, colorless liquid | Visual |
| Formaldehyde Content (as HCHO) | Typically 37% w/w (can vary depending on grade) | Titrimetry or Gravimetry |
| Methanol Content (if applicable) | 10% w/w (typical for stabilized solutions) | Gas Chromatography |
| Density (at 20°C) | ~1.10 g/mL (typical for 37% solution) | Density meter |
| pH | Slightly acidic (typically 3.0 – 4.0) | Potentiometry |
| Freezing Point | Range (depends on concentration) | Freezing Point Apparatus |
| Non-volatile Residue | Max 0.1% | Gravimetry |
| Formic Acid | Max 0.1% | Titrimetry |
