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Physical & Chemical properties

Endpoint summary

Administrative data

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Additional information

The substance is manufactured and supplied as an aqueous solution. For the purposes of REACH compliance, attempts were made to freeze dry a sample of the substance so that some of the applicable physico-chemical testing could be completed. It was not possible to completely remove water from the substance and the freeze-dried material contained approximately 23 % w/w water. For this reason it was not possible to perform melting point, density or flammability studies on the substance itself and use was made of literature data and read across as described below.

The substance is a highly hygroscopic white solid with a melting point expected to be in the range of 126 -136 °C, based on the melting points of the pure alkyl dimethylamine oxide (AO) constituents. Aliphatic amine oxides undergo thermal decomposition/Cope elimination between 110 -200 °C. The vapour pressures of the individual alkyl dimethylamine oxides were estimated using MPBPWIN v 1.43 (modified grain method). Based on these calculations, the vapour pressure of the substance is estimated to be between 4.6E-07 and 2.2E-05 Pa at 25 °C. The relative density of the substance is approximately 0.716 based on read across to C12 -14 AO.

The dissociation constant is 4.01 based on read across from experimental data for the C12 -14 AO. The substance is predicted to be non-explosive based on chemical structure and oxygen balance of the AO constituents and non-oxidising, based on chemical structure. The substance is non-flammable based on read across to a test performed on C12 -14 AO.

The log Pow is < 2.7. This value is considered to be conservative as it is based on the measured value for solubility in n-octanol and the CMC values for the C12 and C14 homologues. For comparison the log Pow derived from experimental estimates of solubility in n-octanol and water was -0.04.