Polyethylene Glycol

Polyethylene Glycol

CAS Number:25322‑68‑3

Chemical Formula:H–(O–CH₂–CH₂)_n–OH (n varies by grade)

Product Introduction

Polyethylene glycols are a family of water-soluble linear polyether polymers. Depending on molecular weight, they range from clear liquids to waxy solids. Known generically as PEG or Macrogol, they are prized in pharmaceuticals, cosmetics, industrial lubricants, adhesives, inks, detergents, and as excipients and laxatives (e.g., PEG 3350)

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Physical & Chemical Properties

Property PEG 400 PEG 3350–4000
Average Molecular Weight ~400 ~3350–4000
Form Clear viscous liquid Pastelike solid
Melting Point 4–8 °C 53–59 °C
Density @ 20 °C 1.125 g/mL ~1.093–1.095 g/mL
Viscosity 90 cSt @ 25 °C 90–140 cSt @ 100 °C
Solubility Miscible in water & organic solvents Miscible in water & organic solvents
Flash Point ~238 °C (COC method) ~246 °C (Cleveland Open Cup, est.)

Applications

  • Pharma & cosmetics:excipient, tablet binder, laxatives (PEG 3350 is Miralax®)
  • Industrial uses:lubricants, coatings, adhesives, inks, detergents, mold release, chemical intermediates
  • Biotech:protein precipitation, cell fusion, PEGylation of therapeutics

Safety & Handling

  • Generally low toxicity (LD₅₀ oral ~28 g/kg in rabbits)
  • Combustible solid/liquid; NFPA (1/0/0)
  • Store sealed below ~30 °C, protect from excessive heat or oxygen to minimize oxidative degradation

Storage & Packaging

  • Lab:100 mL–4 L amber bottles with inhibitor
  • Industrial:25 kg drums, IBCs—stabilized under nitrogen

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