Dipotassium hexacyanocobalt(II)-ferrate(II)

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Data waiving:

other justification

Justification for data waiving:

other:

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACH Annex VII, the self-ignition temperature study (required in section 7.12) does not need to be conducted for solids if preliminary results exclude self-heating of the substance up to 400°C:
- The substance does not melt below 450°C. No evidence of thermal reactions related to self-heating observed up to 450°C.

Furthermore, based on knowledge and experience of the substance, it is considered to be thermally stable and unreactive. This is supported by the following information:
- Substance found to be not highly flammable in the flammability study (Method A.10)
- Explosive properties predicted negative (Method A.14)
- Oxidising properties predicted negative (Method A.17)

In addition, there is no evidence of the substance having pyrophoric properties.

Based on the assessment of the substance, supported by the study information above, it is considered that if a relative self-ignition temperature study (Method A.16) was conducted, no self-heating would be observed and there would be no self-ignition below the substance’s melting point.

It is therefore considered unnecessary to conduct the study. Based on an assessment of the substances properties it is concluded that it does not have self-heating or self-reactive properties.

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

 Thermal analysis (differential scanning calorimetry (DSC)):  Melting point > 450 °C at 1,013 hPa (OECD 102, EU Method A.1, GLP)

Melting / freezing point at 101 325 Pa:

450 °C

The melting point study determined that the substance does not melt at temperatures below 450 °C. Visually, the samples did not change during the study. A supporting thermal decomposition study by J. Lehto et al. (1990) suggests that the substance starts to decompose at 230 °C, and at 300 °C the substance has completely decomposed.

Cross-reference 2

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Flammability test (preliminary screening test): non-flammable (EU Method A.10, GLP)

Flammability:

non flammable

The substance is non-flammable since it failed to ignite when in contact with a bunsen flame for 2 minutes in a flammability study preliminary screening test performed in accordance with the Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A, Methods for the determination of physico-chemical properties, Method A.10 Flammability. It is manufactured, stored, used and handled in ambient temperature and pressure (air) and does not ignite in these conditions. The substance is used as a water purification material (non-deionised water) and has shown no indications of ignition or reaction by releasing flammable gases when in contact with the medium. Based on an assessment of the substance's properties it is also concluded not to have self-heating or self-reactive properties. The substance can therefore be regarded as non-flammable.

The substance is classified as non-flammable as it failed to ignite in a flammability study preliminary screening test performed according to Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A, Methods for the determination of physico-chemical properties, Method A.10 Flammability.

Cross-reference 3

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Data waiving in accordance with column 2 of REACH Annex VII. Prediction based on chemical structure: explosive properties predicted negative (EU Method A.14)

Explosiveness:

non explosive

Data waiving in accordance with REACH Regulation Annex VII column 2: the study for Explosive properties (required in section 7.11) does not need to be conducted if there are no chemical groups associated with explosive properties present in the molecule.

The method A.14 Explosive properties (EC No 440/2008) lists the Handbook of Reactive Chemical Hazards (4th edition, Butterworths, London, 1990 ISBN: 0-750-60103-5) by Bretherick L. as the reference for the determination of reactive chemical groups. The 7th edition (Academic Press, 2007) was adopted for the prediction. According to the method A.14 and column 2 of Annex VII, if the substance has no reactive chemical groups, the product can be predicted to be non explosive and the actual test does not need to be conducted.

In accordance with the literature work by Bretherick, the structure of the commercial hexacyano product does not indicate that there are any explosive properties associated with the product. Furthermore, the substance has failed to react when exposed to a bunsen flame for two minutes (study record 4.13 Flammability).

The explosive properties of the substance have been predicted negative using a procedure compatible with Method A.14 Explosive Properties of Commission Regulation (EC) No 440/2008 of 30 May 2008. The substance is therefore not classified as explosive.

Cross-reference 4

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Data waiving in accordance with column 2 of REACH Annex VII. Prediction based on chemical structure: oxidising properties predicted negative (EU Method A.17)

Oxidising properties:

no

Data waiving in accordance with column 2 of REACH Annex VII: the oxidising properties study (required in section 7.13) does not need to be conducted if there are no chemical groups associated with oxidizing properties present in the molecule. The method A.17 Oxidising properties (EC No 440/2008) concurs with this interpretation. For the prediction of oxidizing properties in the substance’s chemical structure, the Handbook of Reactive Chemical Hazards (7th edition, Academic Press, 2007) by Bretherick L. was used. According to the method A.17 and column 2 of Annex VII, if the substance has no reactive chemical groups, the product can be predicted to be non-oxidising and the actual test does not need to be conducted.

In accordance with the literature work by Bretherick, the structure of the commercial hexacyano product does not indicate that there are any oxidising properties associated with the product, e.g. because it contains neither oxygen nor halogen atoms.

The substance has been predicted negative for oxidising properties based on its chemical structure using a procedure compatible with Method A.17 Oxidising Properties (Solids) of Commission Regulation (EC) No 440/2008. The substance is therefore not classified as oxidising.