Registration Dossier

Physical & Chemical properties

Surface tension

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Description of key information

For two closely related substances:
2-(2-methoxyethoxy) ethanol: 65mN/m @ 25g/l (25C)
2-butoxyethanol: 51mN/m @ 11g/l (25C)
For pure substance:
30-34mN/m undiluted (20C)
For diluted substance:
200g/l: 34.8mN/m

Key value for chemical safety assessment

Surface tension:
69
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

Key parameter is a predicted result based on interpolation of measured data at higher concentrations on two analogue substances with similar molecular structure. It would be expected that the behaviour of 2 -(2 -butoxyethoxy) ethanol would be somewhere between these two analogues. The validity of interpolation is further justified by reference to the attached glycol ethers category document in chapter 13 of the lead company registration dossier, which shows a clear trend of increasing surface tension (decreasing surface activity) with decreasing alkyl chain length within the diethylene glycol ethyl ether homologous family of substance, although not within a concentration range that would suggest significant surface active potential.

Overall, there is sufficient evidence available to be able to postulate that this substance would not have any significant surface active properties at low concentrations.