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Appendices 1-18 to: Report on the Health Effects of Selected Pesticide Coformulants

Appendix 13: Diethylene glycol mono-n-butyl ether (DEGBE) 
96     General description

Diethylene glycol mono-n-butyl ether (DEGBE) has been selected for evaluation within this project. Because ethylene glycol ether acetates are rapidly metabolised by plasma esterases to the parent ethylene glycol ethers following absorption, the biological fate and thus, the toxicological effects of the acetate (DEGBEA) of DEGBE are expected to be very similar to those of DEGBE. Therefore, data on DEGBEA are included in this document when considered relevant.

96.1     Identity

Molecular formula:          C₈H₁₈O₃

Structural formula:          

Molecular weight:            162.23

CAS-no.:                        112-34-5

Synonyms:                             Butoxy diethylene glycol

                                      2-(2-n-Butoxyethoxy)ethanol

                                             Butyl carbitol

                                             Butyl diglycol

                                      Diethylene glycol butyl ether

                                             Diglycol butyl ether

                                      Ethanol, 2,2‘-oxybis-, monobutyl ether

                                             1-Hydroxy-3,6-dioxadecan

                                      2-Hydroxy-2-butoxy-diethylether

                                      2,2-Oxybisethanol monobutyl ether

                                      Dowanol DB

96.2     Physical / chemical properties

Description:                    Colourless liquid with a weak odour and bitter taste.

Melting point:                  -68.1°C

Boiling point:                   226-234°C

Density:                          0.95 g/ml (at 20°C)

Vapour pressure:             0.02 mmHg (2.7 Pa) (at 20°C)

Concentration of

saturated vapours:           27 ppm (182 mg/m³) (calculated) at 20°C and 760 mmHg

Conversion factor:           1 ppm = 6.75 mg/m³        (at 20°C and 760 mmHg)

                                      1 mg/m³ = 0.148 ppm

logP_{octanol/water}:                 0.3; 0.56; 0.82; 4.69

Solubility:                        Water: miscible.

                                      Also soluble in acetone, alcohol, benzene, and ether.

References:                    A&H (1995), ChemFinder (2001), DECOS (1996), HSDB (2000), IUCLID (2000).

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