Dimethyl Carbonate

Key Physical and Chemical Properties

• Appearance: Clear, colorless liquid

• Purity: Typically ≥99.0% (industrial), ≥99.5% (pharma), ≥99.9% (battery/electronic grade)

• Melting Point: 2–4 °C

• Boiling Point: 90 °C

• Density: 1.069–1.073 g/mL at 25 °C

• Flash Point: 18 °C (closed cup); highly flammable

• Vapor Pressure: ~18 mmHg at 21 °C

• Refractive Index: n20/D 1.368

• Solubility: Slightly soluble in water (~13.9 g/100 mL); fully miscible with most organic solvents (alcohols, ethers, ketones)

• Vapor Density: 3.1 (air = 1)

• Explosive Limits: 4.2–12.9% in air

  
  

DMC stands out for its low toxicity, biodegradability, high solvency power, low viscosity, and high dielectric constant, positioning it as a preferred "green" solvent and reagent.

Primary Applications and Uses

• Lithium-Ion Battery Electrolytes: Essential co-solvent in Li-ion battery electrolytes due to excellent electrochemical stability, low viscosity, high dielectric constant, and ability to improve ionic conductivity, charge-discharge efficiency, and thermal performance in EVs, consumer electronics, and energy storage systems.

  
  

• Polycarbonate Production: Key non-phosgene route intermediate for polycarbonate synthesis via transesterification with bisphenol A, enabling greener plastic manufacturing.

  
  

• Solvent in Coatings, Paints, Adhesives, and Inks: Fast-evaporating, VOC-exempt (in many regions) polar solvent that replaces traditional solvents like MEK, acetone, or glycol ethers; provides excellent solvency, quick drying, and reduced emissions.

  
  

• Pharmaceutical and Agrochemical Synthesis: Green methylating and carbonylating agent for APIs, intermediates, carbamates, and pesticides; low-toxicity alternative in drug formulation and organic synthesis.

  
  

• Fuel Additives and Clean Energy: Boosts oxygen content and octane number in fuels; used in biodiesel production and as an eco-friendly additive.

  
  

• Other Uses: Reagent in organic synthesis (methoxylation, carbonylation), cleaning/degreasing agents, lubricants, polyurethane production, and as a preservative or solvent in specialized applications.

  
  

Why Choose Our High-Quality Dimethyl Carbonate?

Our DMC is supplied in multiple grades—industrial (>99.0%), pharmaceutical (>99.5%), and battery/electronic (>99.9% with ultra-low impurities)—to meet stringent requirements for purity, moisture control, and metal ion limits. Strict quality assurance ensures minimal contaminants for reproducible results in sensitive battery formulations, pharmaceutical processes, and high-performance coatings. Packaged under inert conditions to preserve stability and prevent moisture ingress.

Safety and Handling Information

Dimethyl carbonate is classified as a highly flammable liquid (Category 2) under GHS. Vapors are heavier than air and can form explosive mixtures. It may cause eye/skin irritation and is harmful if inhaled or swallowed in large amounts. Handle in well-ventilated areas or fume hoods with grounding to prevent static sparks. Use explosion-proof equipment, wear appropriate PPE (flame-resistant clothing, gloves, goggles), and avoid ignition sources. Store in tightly sealed containers in a cool, dry place away from oxidizers and strong bases. Refer to the latest SDS for full hazard, first aid, and disposal information.

Frequently Asked Questions (FAQs)

What is the CAS number for dimethyl carbonate?

The CAS number is 616-38-6.

What makes dimethyl carbonate a "green" chemical?

It is low-toxicity, biodegradable, VOC-exempt in many jurisdictions, and produced via non-phosgene routes, serving as a safer alternative to dimethyl sulfate, phosgene, or methyl halides.

Why is DMC widely used in lithium-ion battery electrolytes?

Its high dielectric constant, low viscosity, and electrochemical stability enhance ionic conductivity, battery efficiency, and cycle life compared to other carbonate solvents.

Is dimethyl carbonate suitable for pharmaceutical applications?

Yes, pharmaceutical-grade DMC meets high purity standards and is used as a methylating/carbonlating agent in API synthesis with reduced toxicity risks.

How does DMC compare to other solvents like acetone or MEK?

DMC offers similar or better solvency, faster evaporation, lower toxicity, and often VOC-exempt status, making it a preferred replacement in paints, coatings, and cleaning formulations.

Is dimethyl carbonate flammable?

Yes, it is highly flammable with a low flash point (~18 °C); handle with strict fire prevention measures.

For quotations, certificates of analysis, samples, custom grades, or bulk supply of dimethyl carbonate CAS 616-38-6, please reach out to our team.

Contact us

Email: lisa@aozunchem.com

WeChat/WhatsApp: +86-186 5121 5887

We deliver high-purity, reliable dimethyl carbonate worldwide with competitive pricing, fast lead times, and expert technical support.