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Physical & Chemical properties

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Description of key information

Appearance / physical state / colour:

On the basis of physical observation and using the sense of smell, prussian blue was observed to be a solid blue powder.

Melting point/ Freezing point:

The melting point determination of prussian blue (CAS No. 14038-43-8) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and mean decomposition temperature was determine to be 219.5°C at 975.0 hPa.

Boiling point:

The study does not need to be conducted because the substance is a solid which decomposes before boiling. The study does not need to be conducted because the substance is solid which decomposes before boiling, the melting point decomposition of Prussian blue in air was determined in the range 219.5 Deg C. therefore study scientifically not necessary and hence boiling point end point is considered to be waiver.

Density:

The density of Prussian blue was determined to be 1.80 g/cm3.

Particle size distribution (Granulometry):

The particle size distribution of Prussian blue was determined to be less than 20 nm with a specific surface area of 100 square meters/gram.

Vapour pressure:

The study does not need to be conducted because the Prussian blue was decomposed in the range of 210–360°C, therefore study scientifically not necessary and hence vapour pressure end point is considered to be waiver.

Partition coefficient:

Water solubility:

The solubility of Prussian blue in water was determined as, the given complex is considered to be insoluble in water.

Surface tension:

In accordance with column 2 of Annex VII of the REACH regulation, the study need only be conducted if surface activity is a desired property of the chemical. The Prussian blue (14038-43-8) is used as a laboratory chemicals, in paints, ink, enamels, resins ,etc. For this use, surface activity is not an important property. Hence this study was considered for waiver.

Flash point:

The study does not need to be conducted because the substance Prussian blue is an inorganic compound and hence this study was considered to be waiver.

Autoflammability:

The auto ignition point of Prussian blue was determined as 600-625 deg C.

Flammability:

Prussian blue does not indicate any ignition when the flame of bunsen burner having temperature of approximately 950°C is brought in contact with it. Thus it can be concluded that Prussian blue is not flammable at high temperature. However since such high temperatures are not found under normal circumstances of transportation and use, thus Prussian blue was considered as non-flammable.

Explosiveness:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties.

Oxidising properties:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with oxidizing properties and hence the classification procedure does not need to be applied.

Stability in organic solvents and identity of relevant degradation products:

The study does not need to be conducted because the substance is inorganic.

pH:

The pH determination of test item prussian blue (CAS No 14038-43-8) was done following OECD guideline 122. pH of 1% w/v dispersion was measured with the help of pH meter and it was observed to be 4.76 at 29.5 °C.

Dissociation constant:

The study does not need to be conducted because the substance is insoluble.

Viscosity:

The study does not need to be conducted because the substance is a solid. The physical appearance of Prussian blue was observed as, dark blue colored odourless solid powder inorganic compound.

Additional information

Appearance / physical state / colour:

On the basis of physical observation and using the sense of smell, prussian blue was observed to be a solid blue powder.

Based on available data from handbook and authoritative database, the physical appearance of Prussian blue was observed as, dark blue colored odourless solid powder inorganic compound.  

Melting point/ Freezing point:

The melting point determination of Test item prussian blue (CAS No. 14038-43-8 ) was done as per the test guideline OECD 102. The method followed was according to Capillary/metal block. The mean decomposition temperature was determine to be 219.5°C at 975.0 hPa.

Based on available data from handbook, the decomposition of Prussian blue in air was considered to be in the range 250–350°C

Other supporting study from another handbook, also suggested the Prussian blue was partially decomposes around 250°C, and this value is in the range of selected key value.

Boiling point:

The study does not need to be conducted because the substance is a solid which decomposes before boiling. The study does not need to be conducted because the substance is solid which decomposes before boiling, the melting point decomposition of Prussian blue in air was determined in the range 219.5 Deg C. therefore study scientifically not necessary and hence boiling point end point is considered to be waiver.

Density:

Based on available data from handbooks and authoritative databases, the density of Prussian blue was determined to be 1.80 g/cm3.

Particle size distribution (Granulometry):

Based on available data from authoritative database, the particle size distribution of Prussian blue was determined to be less than 20 nm with a specific surface area of 100 square meters/gram.

Vapour pressure:

The study does not need to be conducted because the Prussian blue was decomposed in the range of 210–360°C, therefore study scientifically not necessary and hence vapour pressure end point is considered to be waiver.

Partition coefficient:

Water solubility:

Based on available data from handbooks and authoritative database, the solubility of Prussian blue in water was determined as, the given complex is considered to be insoluble in water.

Surface tension:

In accordance with column 2 of Annex VII of the REACH regulation, the study need only be conducted if surface activity is a desired property of the chemical. The Prussian blue (14038-43-8) is used as a laboratory chemicals, in paints, ink, enamels, resins ,etc. For this use, surface activity is not an important property. Hence this study was considered for waiver.

Flash point:

The study does not need to be conducted because the substance Prussian blue is an inorganic compound and hence this study was considered to be waiver.

Autoflammability:

Based on available data from authoritative database, the auto ignition point of Prussian blue was determined as 600-625 deg C.

This considered that Prussian blue is not auto-flammable at room temperature.

Flammability:

Prussian blue does not indicate any ignition when the flame of bunsen burner having temperature of approximately 950°C is brought in contact with it. Thus it can be concluded that Prussian blue is not flammable at high temperature. However since such high temperatures are not found under normal circumstances of transportation and use, thus Prussian blue was considered as non-flammable.

Explosiveness:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties.

Oxidising properties:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with oxidizing properties and hence the classification procedure does not need to be applied.

Stability in organic solvents and identity of relevant degradation products:

The study does not need to be conducted because the substance is inorganic.

pH:

The pH determination of test item prussian blue (CAS No. 14038-43-8 ) was done as per the test guideline OECD 122. The mean pH of the test dispersionwas determined with the help of digital pH meter. The mean pH was determine to be 4.76 at 29.5 °C.

Dissociation constant:

The study does not need to be conducted because the substance is insoluble.

Viscosity:

The study does not need to be conducted because the substance is a solid. The physical appearance of Prussian blue was observed as, dark blue colored odourless solid powder inorganic compound.