What Is Ethylene Glycol (EG)?
Ethylene Glycol (EG): A small molecule (C₂H₆O₂) with two hydroxyl groups, EG is a clear, odorless, viscous liquid with a low molecular weight (62 Da). It's highly soluble in water, hygroscopic, and has a low freezing point, making it a go-to for antifreeze and solvents.
What Is Polyethylene Glycol (PEG)?
Polyethylene Glycol (PEG): A polymer (HO-(C₂H₄O)n-H) made of repeating EG units, PEG varies in molecular weight (200-20,000 Da), affecting its form (liquid to waxy solid). It's water-soluble, non-toxic, and stable, ideal for diverse applications from lubricants to drug delivery.
Key Differences Between Polyethylene Glycol and Ethylene Glycol
The difference between polyethylene glycol and ethylene glycol shapes their industrial uses. Here's a detailed breakdown:
- Molecular Weight: EG's low molecular weight (62 Da) makes it a lightweight, reactive solvent. PEG's range (200-20,000 Da) allows customization-low-MW PEGs (e.g., PEG 400) are liquids, while high-MW PEGs (e.g., PEG 4000) are solids.
- Toxicity: EG is toxic if ingested, posing risks in spills or exposure (lethal dose ~1.4 mL/kg in humans). PEG is generally non-toxic, widely used in food, cosmetics, and pharmaceuticals, making it safer for worker handling.
- Viscosity: EG has low viscosity, ideal for fluid applications like antifreeze. PEG's viscosity increases with molecular weight, suiting thicker formulations like ointments or lubricants.
- Biodegradability: EG is less biodegradable, persisting in water systems and requiring careful disposal. Low-MW PEGs (e.g., PEG 400) are more biodegradable, aligning with eco-friendly goals, though high-MW PEGs degrade slowly.
- Reactivity: EG is more reactive, used in chemical synthesis (e.g., polyester production). PEG is chemically stable, acting as a carrier or stabilizer rather than a reactant.
What is Ethylene Glycol (EG) used for?
Ethylene glycol is a useful industrial compound found in many consumer products. Examples include antifreeze, hydraulic brake fluids, some stamp pad inks, ballpoint pens, solvents, paints, plastics, films, and cosmetics.
What is Polyethylene Glycol (PEG) used for?
- Cosmetics: PEG acts as an emollient, thickener, or surfactant in creams, shampoos, and lotions, improving texture and skin feel in polyethylene glycol vs ethylene glycol formulations.
- Lubricants: High-MW PEG are used in industrial lubricants for machinery, offering low friction and high stability under heat.
- Polymer Processing: PEG acts as a plasticizer or mold release agent in rubber and plastic production, enhancing flexibility and ease of processing.
Advantages
1) Small batch shipment and sub-packaging are available.
2). Provide COA, MSDS, Health Certificate, and Origin Certificate.
3) Quality first, service best.
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