Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

The endpoints used to describe the intrinsic properties of the substance are performed on the substance without water (dried substance or powder). The endpoints concerned are : melting point; boiling point and density.

The endpoints used to determine the classification and hazard properties of the substance are performed on the commercial form (aqueous solution). The endpoints concerned are : surface tension, flash point, auto flammability, flammability, viscosity and metal corrosion.

For some endpoints, a read across approch is performed from supporting substance (structural analogue or surrogate). Indeed,

Cocamidopropyl hydroxysultaine C8-18 and Lauramidopropyl hydroxysultaine have the same functional groups, the same general composition and the same main component (C12 alkylamidopropylhydroxysultaine).

So the vapour pressure, water solubility and partition coefficient tests are performed on Cocamidopropyl hydroxysultaine C8-18 without water (dried substance or powder). These endpoints describe the intrinsic properties of the substance.

The following endpoints are performed on commercial form (aqueous solution) of Cocamidopropyl hydroxysultaine C8-18 as they determine the classification and hazard properties of the substance: explosivity and oxidising properties.

In the following table, the physico-chemical properties of the substance are summarized:

Endpoint 

Experimentalresult

Melting point 

55°C at 101 325 Pa

Boiling point

311.6°C at 101 325 Pa

Relative density 

1,304 at 20°C

Particle size distribution 

Waiving in accordance with column 2 of REACH Annex VII (a granulometry study does not need to be conducted as the test item is manufactured and used in a non-solid (liquid) form)

Vapour pressure

0.000000023 Pa at 20°C

Partition coefficient 

2.1 at 25°C

Water solubility 

556g/l at 20°C

Surface tension

38.5 mN/m at 20°C

Flash point 

No flash point was observed up to 120.0 °C(corrected values).

At 120.0 °C, the test item boiled.

Auto Flammability 

396°C at 101 325 Pa

Flammability 

Non flammable

Explosiveness

Non explosive

Oxidising properties 

Non oxidising

Stability in organic solvents 

Waiving according to column 2 of REACH annex IX column 1 of end point 7.15. The study is only required if stability of the substance is considered to be critical. Stability in solvents is not critical for this substance.

Dissociation constant

In accordance with column 2 of REACH Annex IX, dissociation constant (required in section 7.16) does not need to be conducted as it is scientifically not possible to perform the test (an amphoteric UVCB substance). The substance is always in an ionised form..

Viscosity 

28.65 mPa.s at 20°C

Metal corrosivity

Non corrosive on metal