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Expert Judgement 
Due to the absence of chemical groups or other structural alerts this substance is not considered to exhibit an high hazard potential.
Triethylene glycol butyl ether or 2-(2-(2-butoxyethoxy)ethoxy)ethanol as member of “The High Boiling Ethylene Glycol Ethers category“ is of low priority for further work based on a low hazard potential.
Therefore testing for Additional physico-chemical properties does not need to be performed.
Some Additional physico-chemical information is available:
Spectral Properties:
Index of refraction = 1.4389 at 20 deg C/D
[Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]
1H NMR: 9739 (Sadtler Research Laboratories spectral collection)
[Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]
MASS: 80692 (NIST/EPA/MSDC Mass Spectral database, 1990 version)
[Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]
Percent in saturated air: 0.00032 at 25 deg C; 1 ppm = 8.44 mg/cu m at 25 deg C, 760 mm Hg; 1 mg/L = 118.5 ppm at 25 deg C, 760 mm Hg
[Boatman R J, Knaak JB; Patty's Toxicology. (2005) NY, NY: John Wiley & Sons, Inc. Ethers of Ethylene Glycol and Derivatives. On-line posting date: Apr 16, 2001.]
Wt/gal at 25 deg C = 8.30 lb
[Dow Chemical Company; The Glycol Ethers Handbook. Midland, MI: Dow Chemical Co. 97 pp (1990)]
Freezing point: -47.6 deg C. BP: decomposes.
[Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 14th Edition. John Wiley & Sons, Inc. New York, NY 2001., p. 172]

Additional information

Additional physico-chemical information

Spectral Properties:

Index of refraction = 1.4389 at 20 deg C/D [Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]

1H NMR: 9739 (Sadtler Research Laboratories spectral collection) [Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]

MASS: 80692 (NIST/EPA/MSDC Mass Spectral database, 1990 version) [Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2674]

Percent in saturated air: 0.00032 at 25 deg C; 1 ppm = 8.44 mg/cu m at 25 deg C, 760 mm Hg; 1 mg/L = 118.5 ppm at 25 deg C, 760 mm Hg [Boatman R J, Knaak JB; Patty's Toxicology. (2005) NY, NY: John Wiley & Sons, Inc. Ethers of Ethylene Glycol and Derivatives. On-line posting date: Apr 16, 2001.]

Wt/gal at 25 deg C = 8.30 lb [Dow Chemical Company; The Glycol Ethers Handbook. Midland, MI: Dow Chemical Co. 97 pp (1990)]

Freezing point: -47.6 deg C. BP: decomposes. [Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 14th Edition. John Wiley & Sons, Inc. New York, NY 2001., p. 172]