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Polyethylene glycol

Names
IUPAC name Polyethylene glycol
Identifiers
CAS Number	25322-68-3
Properties
Chemical formula	C2nH4n+2On+1, n = 8.2 to 9.1
Molar mass	380-420 g/mol
Density	1.128 g/cm³
Melting point	4-8 °C
Viscosity	90.0 cSt at 25 °C, 7.3 cSt at 99 °C
Hazards
Flash point	238 °C
Lethal dose or concentration (LD, LC):
LD50 (median dose)	30 mL/kg, orally in rats
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

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.

Additional Properties

PEG 400 is strongly hydrophilic. The partition coefficient of polyethylene glycol 414 between hexane and water is 0.000015 (log${\displaystyle P=-4.8}$), indicating that when polyethylene glycol 414 is mixed with water and hexane, there are only 1.5 parts of polyethylene glycol 414 in the hexane layer per 100,000 parts of polyethylene glycol 414 in the water layer.

PEG 400 is soluble in water, acetone, alcohols, benzene, glycerin, glycols, aromatic hydrocarbons and is slightly soluble in aliphatic hydrocarbons.

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. PMID 2293598.{{cite journal}}: CS1 maint: multiple names: authors list (link)

• The Merck Index, 11th Edition
• Handbook of Pharmaceutical Excipients

• Polyethers