PEG 400

Polyethylene glycol

Names
IUPAC name Polyethylene glycol
Identifiers
CAS Number	25322-68-3 Y
ChemSpider	none
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 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):
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 [77 °F], 100 kPa).
N  (what is YN ?)
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.

PEG 400 is strongly hydrophilic. The partition coefficient of PEG 400 between hexane and water is 0.000015 (log${\displaystyle P=-4.8}$), indicating that when PEG 400 is mixed with water and hexane, there are only 15 parts of PEG 400 in the hexane layer per 1 million parts of PEG 400 in the water layer.

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