Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Appearance/physical state/colour

Sika Hardener LG is a faint yellow, almost odourless substance which is liquid at 20 °C and 101.3 kPa.

Melting point

The determination of the melting point was performed according to EU guideline A.1 and OECD 102 by applying the capillary method

The melting range of Sika Hardener LG was determined as -16.9 to -16.1 °C (256.3 to 257.1 K) at 101.3 kPa.

Boiling point

The determination of the boiling point was performed according to EU guideline A.2 and OECD 103. No

boiling point was determined experimentally, because of test item decomposition at approx. 250 °C and atmospheric pressure. Decomposition was observed in two independent determinations.

Density

The determination of the relative density was performed according to EU guideline A.3 and OECD 109.

Using the pycnometer method, density of Sika Hardener LG was determined to be 0.9489 ± 0.0001 g/cm3 at 20 ± 0.5 °C.

Particle size distribution (Granulometry)

The particle size distribution was not determined as according to column 2 of REACH Annex VII, the determination of particle size distribution (required in section 7.14) does not need to be conducted as the substance is marketed or used in non-solid or non-granular form. At room temperature (20 °C) Sika Hardener LG is a liquid.

Vapour pressure

The vapour pressure of Sika Hardener LG at 25 °C was estimated to be 8.93E-10 mm Hg corresponding to 1.12E-07 Pa using the Modified Grain method (program: MPBPWIN of EPI Suite).

As the available experimental methods allow a determination of vapour pressure down to 1*E-5 Pa only, no meaningful experimental determination of the vapour pressure for Sika Hardener LG is possible. Therefore, in accordance to the respective EU guideline A.4, no experimental determination of the vapour pressure for Sika Hardener LG is required.

Partition coefficient

Due to the immediate hydrolysis of Sika Hardener LG when being in contact with water, a measurement of the partition coefficient is technically not feasible. Therefore, the log kow of Sika Hardener LG was calculated by means of the program KOWWIN, which is part of the program compilation EPI Suite. The resulting log Kow for Sika Hardener LG is 5.05.

Water solubility

Due to the immediate hydrolysis of Sika Hardener LG when being in contact with water, a measurement of the water solubility is technically not feasible. The water solubility of Sika Hardener LG was calculated by means of two different programmes (WATERNT Program v1.01 and WSKOW v1.41), which are all part of the program compilation EPI Suite.

The calculative highest water solubility of Sika Hardener LG is 0.2231 mg/L at 25°C and a pH range of 7.55-7.72. Sika Hardener LG is to be described as poorly soluble.

Surface tension

Using the plate method, the surface tension of the test item Sika Hardener LG in an aqueous solution (1000 mg/L) was determined as 31.98 ± 0.49 mN/m at 19.9 °C. One additional measurement was performed for verification (after 70 minutes). No significant changes and thus no significant dependence on time and temperature was observed.

As all measured values were lower than 60 mN/m Sika Hardener LG is to be classified as surface active.

Flash point

The determination of the flash point was performed according to EU guideline A.9. A flash point of 195.5 ± 0.7 °C at 1013.25 hPa was determined for Sika Hardener LG suing a non-equilibrium method (Pensky-Martens apparatus). This result is the mean and the standard deviation of two independent determinations.

Auto flammability

An auto ignition temperature of 355 °C at 98 600 Pa was determined in accordance with EU-Method A.15 and DIN 51794.

This value is the lowest value out of three independent determinations, rounded down to a whole multiple of five. All measured values were in a range of 10 K as demanded in the respective DIN standard for sufficient precision.

Flammability

Based on the determination of the flash point according to EU Method A.9 and the respective expert statements, Sika Hardener LG is not considered to be flammable (as such or in contact with water) and has no pyrophoric properties. As Sika Hardener LG is a liquid at room temperature (20 °C) a study according to EU Method A.10 (Flammability (Solids))) is not required. Instead, a determination of the flash point according to EU Method A.9 was performed. Considering the chemical structure of Sika Hardener LG there are no groups associated with flammability properties (as such or in contact with water) and/or pyrophoric properties. Thus, the experimental test to determine whether the reaction of a substance with water or damp air leads to the development of dangerous amounts of gas or gases, which may be highly flammable, according to EU Method A.12, as well as the determination of pyrophoric properties according to EU Method A.13 , was replaced by a theory based evaluation.

Explosiveness

In accordance with column 2 of REACH Annex VII, the test on explosiveness (required in section 7.11) does not need to be conducted as the chemical structure of Sika Hardener LG does not contain chemical groups, which may lead to the conclusion that explosive properties have to be expected. EU Method A.14 was replaced by a theoretical based evaluation. The chemical structure of Sika Hardener LG does not contain chemical groups or individual structural components of the molecule, which may lead to the conclusion that explosive properties have to be expected. Therefore, experimental determination of explosive properties are not performed.

Oxidising properties

In accordance with column 2 of REACH Annex VII, the test on oxidising properties (required in section 7.13) does not need to be conducted as the chemical structure of Sika Hardener LG does not contain chemical groups, which may lead to the conclusion that oxidising properties have to be expected. EU Method A.17 was replaced by a theory based evaluation. In general, oxidising properties are not expected for an organic molecule that does not contain oxygen, chlorine or fluorine or if the molecule does contain oxygen, chlorine or fluorine, but these elements are only chemically bonded to carbon or hydrogen. As can be seen from the chemical structure, this is the case for Sika Hardener LG. The substance does not contain chlorine or fluorine and all the oxygen atoms are bound to carbon atoms only and thus, do not impose any oxidising properties. Sika Hardener LG is not considered oxidising. No experimental determination was carried out.