What Is the Difference Between MEG and Propylene Glycol?
The primary difference between Mono Ethylene Glycol (MEG) and Propylene Glycol (PG) is that MEG is highly toxic and best for industrial cooling, while PG is non-toxic, safe for human consumption, and used in food/pharma applications.
Mono Ethylene Glycol (MEG)
- Toxicity: Highly toxic, requiring strict handling.
- Best Use: Industrial applications, automotive antifreeze, de-icing, and PET plastic production.
- Performance: Lower viscosity and better heat transfer efficiency than PG.
- Cost: Generally cheaper than PG.
Propylene Glycol (PG)
- Toxicity: Non-toxic, safe for human and animal consumption.
- Best Use: Food processing, breweries, HVAC in sensitive areas, and pharmaceuticals.
- Performance: Higher viscosity (requires more pumping power) and lower efficiency than MEG.
- Cost: More expensive, often 30% more costly than MEG.
| Item | MEG (Monoethylene Glycol) | Propylene Glycol (PG) |
|---|---|---|
| CAS Number | 107-21-1 | 57-55-6 |
| Chemical Formula | C₂H₆O₂ | C₃H₈O₂ |
| Toxicity | Toxic if ingested | Low toxicity / food-grade available |
| Main Uses | PET, polyester, antifreeze, coolants | Food, pharma, cosmetics, HVAC |
| Coolant Performance | Excellent heat transfer | Good, but lower than MEG |
| Regulatory Limits | Restricted in food & consumer contact | Widely approved (FDA, USP grades) |
| Cost | Lower | Higher |
| Market Volume | Very high | Medium |
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