
Ethylparaben is an ester compound derived from p-hydroxybenzoic acid, with the molecular formula C₈H₁₆O₂ and a molecular weight of 166.17. It is a highly effective, broad-spectrum antimicrobial preservative and a commonly used stabilizing additive in the food, cosmetics, and pharmaceutical industries. Its molecular structure contains a hydroxyl group (-OH) and an ester group (-COO-), giving it good thermal stability, excellent antifungal properties, and low toxicity with good metabolic clearance. It is widely used in various fields, including preservation against spoilage and mold, antimicrobial formulation, and industrial mold prevention.
| Item | Specification |
| Melting point | 114–117°C |
| Boiling point | 297–298°C |
| Density | 1.1708 |
| Vapor pressure | 0.00012 hPa |
| Refractive index | 1.52 |
| Flash point | 297–298 °C |
| Solubility | Sparingly soluble in water; readily soluble in ethanol and methanol |
| Acidity coefficient | 8.31 ± 0.13 |
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