
Epoxidized soybean oil (CAS: 8013-07-8, ESO) is a bio-based epoxy compound produced by the epoxidation of refined soybean oil. Its molecular formula is C₅₇H₉₈O₁₂, and its molecular weight is approximately 975.38. ESO is a pale yellow to amber-colored, transparent, viscous, oily liquid with a faint vegetable oil odor. It is internationally recognized as a non-toxic, environmentally friendly plastic additive. The product is classified by purity into industrial grade (≥98%) and food/medical grade (≥99%), and by epoxide value into standard grade (≥6.0%) and high epoxide value grade (≥6.5%).
| Boiling point | >150°C |
| Density | 0.997 g/mL (lit.) |
| Vapor pressure | 0 Pa at 25°C |
| Freezing point | -4°C |
| Refractive index | n20/D 1.484 (lit.) |
| Flash point | >230°F |
| Solubility | chloroform (slightly soluble), methanol (slightly soluble) |
| Water solubility | 20 ng/L at 20°C |
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