Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Appearance / physical state / colour: The test item is a is a white odourless powder. The data are taken from the Certificate of Analysis in a GLP-compliant study (2016).

 

Melting point / freezing point: The test item melted by 937 °C, as determined by differential scanning calorimetry (2016). No decomposition was observed. This study is considered reliable with restriction (Klimisch 2) as it was a non-GLP study and there are minor restrictions in reporting.

 

Boiling point: The boiling point has been waived because the substance is a solid which melts above 300 °C.

 

Density: The relative density of the test item at 22 °C is 6.8 g/cm3, as determined by helium pentapycnometer. This is a non-GLP experimental study and there are minor restrictions in reporting and therefore is considered reliable with restriction (Klimisch 2).

 

Granulometry: The particle size distribution of bismuth silicate was determined by laser diffraction analysis following wet dispersion. The specific surface area was determined according to the BET multipoint method using the adsorption isotherm (2016). The average 10th, 50th and 90th percentile particle sizes for bismuth silicate were 0.32, 1.00 and 2.96 μm, respectively. The specific surface area was determined as 4.0 m2/g. This is a non-GLP experimental study and there are minor restrictions in reporting and therefore is considered reliable with restriction (Klimisch 2).

 

Vapour pressure: The vapour pressure has been waived because the substance is a solid which melts above 300 °C.

 

Partition coefficient: The partition coefficient has been waived as the substance is inorganic.

 

Water solubility: The water solubility of the test item was determined in a transformation / dissolution test. The test item was essentially insoluble, as 3.32 and 3.77 µg Bi/L were released in test media at pH 6 and pH 8, respectively, after 28 days at a loading rate of 1 mg/L. The study was conducted according to the OECD 29 guideline and is a GLP-compliant and therefore is considered reliable without restrictions (Klimisch 1) (2016). 

 

Surface tension: The surface tension has been waived as based on structure, surface activity is not expected or predicted and surface activity is not a desired property of the material.

 

Flash point: The flash point study has been waived as this substance is inorganic.

 

Self-ignition, auto-flammability and explosive properties have been waived as they are scientifically unjustified based on the nature of the manufacturing process of the substance by heating to high temperatures (800 - 900˚C) and from past practical and extensive experience in the handling of the substance.

Oxidising properties: The oxidising properties study has been waived as there are no chemical groups present in the molecule which are associated with oxidising properties.

Additional information

Physico-chemical endpoints are completed for this substance based on test data following standard test methods, or data waivers. All data are therefore considered to be reliable and relevant for the endpoint concerned.

The substance is not classified for physico-chemical hazards. Based on experience in manufacture and handling of the substance, bismuth silicate does not meet the criteria for oxidising or explosive properties and it is not a flammable or self-heating solid.