Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Appearance

At ambient temperature and pressure, Di-Trimethylpropane is an odourless, white solid flake (Analytical Chemistry, Perstorp Holding AB, 2009).

Melting point

The melting point of Di-Trimethylpropane is 382 K (109 °C) (Analytical Chemistry, Perstorp Holding AB, 2009).

Boiling point

The boiling point of Di-Trimethylpropane is 651 K (378 °C) (Analytical Chemistry, Perstorp Holding AB, 2009).

Density

The relative density of Di-Trimethylpropane is 1.13 at 20 °C (relative to water at 4 °C) (Analytical Chemistry, Perstorp Holding AB, 2009).

Granulometry

The inhalable fraction (< 100 µm) is 90.1% on micronised Di-Trimethylpropane (Analytical Chemistry, Perstorp Holding AB, 2009)

Vapour pressure

Since the vapour pressure is low with both calculation methods (SPARC and MPBPWIN), Di-Trimethylpropane is not likely to vapourise and become airborne. The highest calculatated value is 4.7 x10^-7 Pa.

Partition coefficient

The partition coefficient (log Kow) for Di-Trimethylpropane is -0.88 at 20 °C (Analytical Chemistry, Perstorp Holding AB, 2009).

Water solubility

The solubility of Di-Trimethylpropanein water is 21 g/L at 20°C (Analytical Chemistry, Perstorp Holding AB, 2009).

Surface tension

The surface tension of Di-Trimethylpropane is 59 mN/m at 20°C (Analytical Chemistry, Perstorp Holding AB, 2009).

Flash point

According to "Endpoint specific guidance R.7.1.9.1" flash point does not need to be determined on solids.

Autoflammability

According to "Endpoint specific guidance R.7.1.12.1" testing does not need to be conducted when the substance melts at <160 °C.

Flammability

Di-Trimethylpropane is non flammable (Analytical Chemistry, Perstorp Holding AB, 2009).

Explosiveness

Examination of the structure indicates that there are no groups associated with explosive properties. Therefore, negative results can be predicted and no testing for explosive properties has been carried out.

Oxidising properties

Due to the structural composition of the substance it is not considered to be oxidising. The substance does not contain any of the components listed in “Endpoint specific guidance R.7.1.13.3 table R.7.1-29”. According to “Endpoint specific guidance R.7.1.13.4 no experimental testing has to be conducted if the substance due to structural composition is considered not to be oxidising.

Stability in organic solvents

The stability in organic solvents is not considered critical to ensure confidence in other test results for other endpoints. Therefore testing is not needed to be conducted according to “Endpoint specific guidance R.7.1.16”.

Dissociation constant

The calculation program SPARC has been used for the prediction and gave the result pKa 15 which indicates that the substance is not an ionisable compound. According to “Endpoint specific guidance R.7.1.17.1” the dissociation constant does not have to be conducted for substances that lack ionisable functional groups.

Viscosity

According to “Endpoint specific guidance R.7.1.18.4” viscosity determination is not required for solids.

Additional physico-chemical information

Di-Trimethylpropane is specified as "extremely ignitable" (IBExU Institut fur Sicherheitstechnik GmbH, Perstorp Specialty Chemicals AB, 2008).