Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc

Endpoint summary

Additional information

Appearance/physical state/colour

Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc is an amber coloured UVCB substance with slight odour. Its aggregate state at 20 °C and 1013 hPa is solid.

Melting point/freezing point

Following EU method A.1 resp. OECD 102 (1995), a melting range between 59.4 to 63.3°C (332.6 to 336.5 K) was determined using the capillary method. The values are means of two independent determinations.

Boiling point

As no exact molecular weight and no structural formula is available, calculation of the boiling point was not possible. Following EU method A.2 resp. OECD 103 (1995), a pre-test (heating in an open tube; two independent determinations) succeeded by a main study according to the method of Siwoloboff (duplicate determination) was performed. Due to polymerisation including decomposition of the test item at approximately 65 °C (338 K), determination of a boiling point was not possible.

Density

A density of 1.2340 g/cm3 at 20.0 ± 0.4°C was determined for Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc, following EU method A.3 resp. OECD 109 (1995) and application of the hydrostatical balance method.

Particle size distribution (Granulometry)

Based on dry sieve analysis of the test item Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc, more than 80 % of the test item was found to be bigger than 125 μm and no particles with a diameter below 11 μm. As only residues > 90% were determined, the range of the sieves with 10% < Rx < 90% could not be determined.

Vapour pressure

The test method for the determination of the vapour pressure of a substance as described in Test Guideline A.4 of EC No 440/2008 was replaced by a theoretical based evaluation. The vapour pressure of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc was calculated by means of the program MPBPWIN, which is part of the program compilation EPI Suite. For the calculation of the vapour pressure of the whole reaction product the three main homologues (n=1 to n=3, contents > 10%) have been taken as a basis. According to these results, the vapour pressure of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc, was determined to lie in a range between 7.6 × 10-06 Pa and 1.45 × 10-12 Pa.

As the available experimental methods allow a determination of vapour pressures down to 10-05 Pa only, no meaningful experimental determination of the vapour pressure for Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc is possible. Therefore, in accordance to the respective EC guideline no experimental determination of the vapour pressure is required.

Partition coefficient

The partition coefficient Pow was determined using high performance liquid chromatography (HPLC). As the test substance is a mixture (UVCB substance), the partition coefficient (Pow) of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc is given as a range. The log Pow was determined to lie between 2.78 +/- 0.00 and 5.64 +/- 0.01 (95% confidence interval).

Water solubility

Following the shake-flask method, the water solubility of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc was determined to be 74.7 +/- 5.0 mg/L (95% confidence interval) at 20°C +/- 1°C.

Surface tension

Following EU-Method A.5 resp. OECD 115 (1995), the surface tension of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc was determined to be 62.56 ± 0.07 mN/m. The concentration was determined with 32.21 - 37.82 mg test item/L (based on analysis of dissolved organic carbon in the test solution).

Flash point

As test substance Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc is a solid, determination of the flash point was not carried out. Instead the flammability following EU Method A.10, as required in Section 7.10, REACH, Annex VII was determined.

Auto flammability

The melting point of the test item Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc was determined to be 59.4 – 63.3 °C. Following REACH Regulation Annex VII, 7.12, determination of the self-ignition temperature is not required for test items with melting points ≤ 160 °C. Therefore, testing was not performed.

Flammability

Following EU-Method A.10 and UN-Method N.1, Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc can be considered as not highly flammable (not combustible).

In addition, as Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc does not contain any chemical groups associated with water reactive properties and is thus not considered flammable in contact with water (Ref.: R.7a: Guidance on information requirements and chemical safety assessment, EU-Document (May 2008)).

In addition, experience in handling and use does not indicate flammability upon contact with water and as the test substance is not considered highly flammable, no experimental determination of flammability properties is carried out.

Moreover, Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc does not contain any chemical group that might lead to spontaneous ignition shortly after coming into contact with air at room temperature. Based on experience in handling and use there is also no indicator for pyrophoric properties and therefore a study on pyrophoric properties does not need to be carried out.

Explosiveness

In accordance with column 2 of REACH Annex VII, a test (required in section 7.11) does not need to be conducted as the test substance Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc does not contain any chemical groups associated with explosive properties.

Oxidising properties

The oxidising properties of Reaction product of 2-hydroxybenzoic acid, styrene and oxozinc were determined following EU guideline A.17. The test item showed no vigorous reaction during combustion with cellulose in different proportions. For mixtures with a small amount of the test item, fast combustion was observed with burning rates which were to some extent higher than the burning rate of the reference mixture. However, as no vigorous reaction was observed during combustion, these results were suspected to be false positive. According to the guideline, a verification experiment in an inert atmosphere was performed additionally. Here, in the absence of oxygen the mixture was not inflammable. Based on this, the test item is considered to have no oxidising properties.