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Polyethylene glycol
Polyethylene glycol
Names
IUPAC name
Polyethylene glycol
Identifiers
ChemSpider
  • none
UNII
Properties
C2nH4n+2On+1, n = 8.2 to 9.1
Molar mass 380-420 g/mol
Density 1.128 g/cm3
Melting point 4 to 8 °C (39 to 46 °F; 277 to 281 K)
Viscosity 90.0 cSt at 25 °C, 7.3 cSt at 99 °C
Hazards
Flash point 238 °C (460 °F; 511 K)
Lethal dose or concentration (LD, LC):
30 mL/kg, orally in rats
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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PEG 400 (polyethylene glycol 400) is a low-molecular-weight grade of polyethylene glycol. It is a clear, colorless, viscous liquid. Due in part to its low toxicity, PEG 400 is widely used in a variety of pharmaceutical formulations.

Chemical properties

PEG 400 is strongly hydrophilic. The partition coefficient of PEG 400 between hexane and water is 0.000015 (log), indicating that when PEG 400 is mixed with water and hexane, there are only 15 parts of PEG400 in the hexane layer per 1 million parts of PEG 400 in the water layer.[1]

PEG 400 is soluble in water, acetone, alcohols, benzene, glycerin, glycols, and aromatic hydrocarbons. It is not miscible with aliphatic hydrocarbons and diethyl ether. Therefore, reaction products can be extracted from the reaction media with those solvents.

References

  1. ^ T. Y. Ma; D. Hollander; P. Krugliak; K. Katz (1990). "PEG 400, a hydrophilic molecular probe for measuring intestinal permeability". Gastroenterology. 98 (1): 39–46. doi:10.1016/0016-5085(90)91288-h. PMID 2293598.
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