Ethyl Methyl Carbonate (EMC)
CH₃OC(O)OC₂H₅ · CAS 623-53-0
Ethyl methyl carbonate (EMC) is the third component of the standard EC/DMC/EMC (1:1:1 v/v) Li-ion battery electrolyte. Its intermediate properties between DMC and DEC improve low-temperature ionic conductivity and extend usable temperature range to -20°C and below.
Molecular Weight
104.10 g/mol
Boiling Point
110 °C
Density
1.012 g/mL
Molecular Formula
Available Grades
Analytical Specification
Analytical Specification Table
All values represent maximum allowable limits unless noted ≥. A lot-specific Certificate of Analysis (CoA) with ICP-MS, LPC, and GC data is issued for every shipment. Full data packages available on request.
| Parameter | Test Method | Unit | G4 | G5 ★ |
|---|---|---|---|---|
| Assay (GC) | GC-FID | % | ≥99.99 | ≥99.999 |
| Water (KF) | Karl Fischer | ppm | ≤20 | ≤10 |
| Total Metals | ICP-MS | ppb | ≤0.5 | <0.1 |
| Chloride (Cl⁻) | IC | ppb | ≤100 | ≤50 |
| Acidity | Titration | ppm | ≤5 | ≤2 |
★ G5 = SEMI C1 Tier D (6N grade). All metal values by ICP-MS. Particle counts by in-line LPC during ISO Class 3 fill. CoA available on request.
Grade Comparison
G1 → G5 Purity Scale
Select the grade that matches your process node and contamination budget. Every grade is available from PureTech with full lot CoA and ICP-MS data.
All grades tested by ICP-MS (28 elements), in-line LPC (ISO Class 3 fill), and Karl Fischer titration. G5 = SEMI C1 Tier D. Full CoA per lot. Request CoA template →
Application Areas
Where Ethyl Methyl Carbonate Is Used
Laboratory & Analytical
- Battery research solvent
- carbonate ester synthesis
Industrial & Other
- EV battery gigafactory production
- energy storage system (ESS)
Battery & Energy Storage
Packaging & Supply
Available Container Formats
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