CAS 502-44-3 corresponds to the compound ε – Caprolactone, which is a seven membered cyclic ester monomer with the molecular formula C ₆ H ₁ O ₂ and a molecular weight of 114.14. It is widely used in the synthesis of biodegradable polyesters (such as polycaprolactone PCL) and polymer materials.

Core physical and chemical properties
-Chinese name: ε – Caprolactone (also known as 6-Caprolactone, 2-oxocycloheptanone, ω – Caprolactone)
-English name: ε – Caprolactone/Oxepan-2-one
-Molecular formula/weight: C ₆ H ₁₀ O ₂/114.14
-Appearance: Colorless and transparent oily liquid with a weak aromatic odor, slightly yellowish after prolonged storage
-Melting point/boiling point: about -1 ° C/215-225 ° C (atmospheric pressure)
-Density: Approximately 1.03-1.07 g/mL (25 ° C)
-Solubility: Easily soluble in organic solvents such as water, ethanol, benzene, etc
-Stability: Flammable, prone to ring opening polymerization when exposed to acid, alkali, or water. It needs to be sealed and stored away from moisture. Stabilizers are often added and nitrogen is added for protection

Main application areas
1. Polymer synthesis: Ring opening polymerization is used to prepare polycaprolactone (PCL), which is used for biodegradable plastics, medical sutures, and drug sustained-release carriers
2. Chemical intermediates: synthesis of caprolactam, adipic acid, adhesives, elastomers, coatings, and epoxy resin diluents
3. Material modification: blending with resin to improve gloss, transparency, and anti adhesion
4. Scientific research purposes: research on organic synthesis blocks, pharmaceutical intermediates, and biomaterials

Safety and Storage
-Hazard: Flammable liquid, irritating to eyes/respiratory tract; Heating can produce dimers
-Storage conditions: Store in a cool and dry place, sealed with nitrogen, avoid contact with acids, alkalis, water, and copper zinc metals; Suggest adding a small amount of nitrite ester stabilizer
-Protective advice: Wear protective equipment during operation, maintain ventilation, and stay away from sources of fire

This substance belongs to industrial/scientific research specific chemicals and is not a direct edible or medicinal product. The specific specifications need to be confirmed based on the application scenario to determine the purity level (commonly 97% -99%).

Products :

6-Hexanolactone (Epsilon-Caprolactone monomer) CAS 502-44-3/6-Caprolactone
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