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Physical & Chemical properties

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Appearance/physical state/color

At ambient conditions, SIKA Hardener MH is an almost colourless and nearly odourless liquid.

Melting point/freezing point

The determination of the melting / freezing point of Sika Hardener MH was performed according to OECD Guideline 102 resp. EU Method A.1 resp. OPPTS 830.7200. The determination was performed in duplicate. In both determinations, a melting range was detected. The melting range was determined as - 49.7 to - 42.5 °C (223.5 to 230.7 K). This value is the mean of two independent determinations.

Boiling point

 The determination of the boiling point of Sika Hardener MH was performed according to OECD Guideline 103 resp. EU Method A.2 resp. OPPTS 830.7220. The boiling point was determined as 293.4 °C (566.6 K): This value was the mean of two independent determinations. The test item showed signs of decomposition.

Density

The determination of the density of Sika Hardener MH was performed according to OECD Guideline 109 resp. EU Method A.3 resp. OPPTS 830.7300.

Using the pycnometer method, a density of 0.9671 ± 0.0000 g/cm³ at 20 ± 0.2 °C was measured. This value was the mean of two independent determinations ± the error of determination. The standard deviation was determined to be 0.0002 g/cm³, showing a good correlation of the two determinations.

Particle size distribution (Granulometry)

In accordance with column 2 of REACH Annex VII, the test on particle size distribution (required in section 7.14) was waived, as the substance is marketed or used in non-solid or non-granular from only. SIKA Hardener MH is a liquid at room temperature (20 °C).  

Vapour pressure

The vapour pressure of the test item was determined to be 0.00469 Pa at 20 °C and 0.00554 Pa at 25 °C respectively.

Partition coefficient

The determination of the octanol-water partition coefficient (Kow), according to test guideline A.8 of EC Regulation 440/2008, was replaced by a theory based evaluation. Due to the immediate hydrolysis of SIKA Hardener MH upon contact with water, experimental determination of the partition coefficient was technically not feasible.   Experimental determination of the log Kow of SIKA Hardener MH was replaced by calculation using US EPA EPIWIN (v4.0). The resulting log Kow was 2.95 and the respective Kow was 891.3.

Water solubility 

Due to the immediate hydrolysis of SIKA Hardener MH upon contact with water experimental determination of the water solubility was technically not feasible. Experimental determination of the water solubility according to test guideline A.6 of EC Regulation 440/2008 was replaced by a theory based evaluation. The water solubility was calculated to be 6.64 mg/L at 25 °C. Thus, SIKA Hardener MH was considered to be slightly soluble.

Surface tension

The determination of the surface tension of an aqueous solution of Sika Hardener MH was performed according to OECD Guideline 115 resp. EU Method A.5. The surface tension of an aqueous solution of the test item Sika Hardener MH was determined as 60.14 ± 0.57 mN/m at 20±0.3 °C. One measurement was performed for verification (after 69 minutes), resulting in a value of 60.95 ± 0.13 mN/m. No significant changes and thus no significant dependence on time were observed. As both values were higher than 60 mN/m, Sika Hardener MH was classified asnot surface active.

Flash point

The determination of the flash point of Sika Hardener MH was performed according to EU Method A.9, OPPTS 830.6315 and UN Manual Test Methods 32.4 Three independent determinations were performed. The maximum variation was 3 K. Therefore, the lowest two values (which showed a variation of 2 K) were used for calculation of the mean. The flash point of Sika Hardener MH was determined to be 148.5 °C.

Auto flammability

The determination of the auto ignition temperature of Sika Hardener MH was performed according to EU Method A.15, Five independent determinations were performed. An auto ignition temperature of 262 °C was determined. This value is the lowest value of three independent determinations and the higher temperatures of two determinations were discarded. The auto ignition temperature (rounded) according to EU Method A.15 of Sika Hardener MH is 260 °C.

Flammability

The chemical structure of Sika Hardener MH indicates that there are no groups associated with flammability in contact with water and with pyrophoric properties. Further, experience in handling and use does not indicate flammability upon contact with water and there is also no indicator for pyrophoric properties. No experimental determination of flammability and pyrophoric properties is carried out. Based on the flash point test, revealing flash point of 148.5 °C, the test substance is not considered highly flammable.

Explosiveness

The test method for the determination of the explosive properties of a substance as described for liquid materials in test guideline A.14 of EC No 440/2008 was replaced by a theoretical based evaluation. The chemical structure of SIKA Hardener MH does not contain chemical groups or structural elements in the molecule, which may lead to the conclusion that explosive properties have to be expected. Therefore explosive properties are not expected. No experimental determination was performed.

Oxidising properties

The test method for the determination of the oxidising properties of a substance as described for liquid materials in test guideline A.21 of EC Directive 440/2008/EEC 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. Based on the chemical structure of SIKA Hardener MH no oxidising properties are expected Further, based on experience in handling and use, there is no indication of oxidizing properties. SIKA Hardener MH is not oxidizing. No experimental determination was carried out.