High-Purity Solvents, Polyurethane (PU) and Resin

Ethylene Carbonate (EC)

Ethylene Carbonate (EC) is a cyclic carbonate ester with the chemical formula C₃H₄O₃. It is a critical industrial chemical that appears as a colorless to yellowish crystalline solid at room temperature, transitioning into a transparent, low-viscosity liquid above its melting point of approximately 36° C. Historically valued for its high polarity and chemical stability, EC has gained global prominence as a primary component in the electrolyte formulations of lithium-ion batteries. Its unique ability to facilitate the formation of a stable Solid Electrolyte Interphase (SEI) on graphite anodes is indispensable for modern energy storage. Beyond electrochemistry, EC serves as a high-boiling, low-toxicity solvent and a versatile intermediate in organic synthesis. It is increasingly favored in “green chemistry” initiatives due to its biodegradability and low odor profile, replacing more hazardous solvents in polymer processing, surface coatings, and the production of specialized chemical derivatives.

Attributes

Key Features and Benefits

High Dielectric Constant: With a value of approximately 90, it effectively dissociates electrolyte salts, significantly enhancing ionic conductivity in battery cells.
Superior SEI Formation: Essential for creating a protective layer on battery anodes, which prevents electrolyte degradation and extends cycle life.
High Thermal Stability: Features a high boiling point (243° C) and high flash point, providing safety and performance stability in high-temperature environments.
Eco-Friendly Profile: Classified as biodegradable and exhibiting low toxicity, it serves as a sustainable alternative to traditional halogenated solvents.
Excellent Solvency: Capable of dissolving a wide range of polymers and resins, making it a versatile processing aid.

Specifications

Technical Highlights

CAS Number: 96-49-1
Molecular Weight: 88.06 g/mol
Physical Properties: Melting point of 36–39° C; Density of 1.32 g/cm³ (liquid at 40° C).
Purity Grades: Produced in “Battery Grade” (≥ 99.99%) with moisture content typically below 10 p±, and “Industrial Grade” (≥ 99.5%).
Viscosity: 1.9 mPa⋯ at 40° C, allowing for efficient flow when blended with linear carbonates like DMC or DEC.
Vapor Pressure: Extremely low at room temperature (0.02 mmHg at 36° C), minimizing volatile organic compound (VOC) emissions.