The Same CAS Number Does Not Mean the Same Grade
Industrial and battery-grade Dimethyl Carbonate share CAS 616-38-6, and both may advertise 99.9% assay. That number does not make them equivalent. Lithium-ion electrolyte performance can be affected by very small quantities of water, acid, metals and ionic contaminants.
Battery-Grade Controls
Commercial battery-grade specifications may combine ≥99.9% assay with water below 10 ppm and acid below 10 ppm. Suppliers may also control methanol, trace metals, chloride or other ionic impurities. The exact limits depend on the electrolyte producer and cell chemistry.
Industrial Grade Priorities
Industrial solvent or synthesis users may focus on assay, water, acidity, methanol, color and non-volatile residue without requiring the same ppm-level electrolyte controls. Paying for battery grade is unnecessary when those additional limits do not affect the validated process, while using ordinary industrial grade in an electrolyte can create avoidable performance risk.
Questions Before Ordering
- What is the intended application?
- Which water and acid methods and limits apply?
- Are metals and ionic impurities controlled?
- Does packaging preserve the required cleanliness?
- Can a recent representative COA be reviewed?
Xinchen’s standard listing is high-purity industrial DMC unless battery-grade requirements are separately confirmed.