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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

  • Based on its physical-chemical properties, fosfor-slag cannot be classied as a hazardous substance with physico-chemical hazards according to the criteria of the Dangerous Substances Directive (67/548/EC) or CLP regulation (1272/2008/EC).
    • Appearance/form: Fosforslag( P-slag) is a stone-like grey-blue solid in particulate or powder form.
    • Density: The relative density of fosforus slags was measured 22 times in the period 2005 to 2010 on as many samples of slag according to method EN 1097-6 as part of company quality control regime. Extrapolating the measured values to 0% water absorption results in a relative density 2,86 g/cm3, for fosforus slags. all values and calculations can be found in the attached background material.
    • Granulometry: The average percentage of particles with a diametre of < 0,063 mm in the test substance is 1,3 (m/m) % with a standard deviation of 1,2 according to method EN 933-1 of various test over a 5 year period.
    • Water solubility: Due to the low solubility in water the dissolution/transformation protocol was used to further evaluate the solubility of the constituents of P-slag. If the cristalline structure of P-slag would solve in water, the elements would be present as ions in solution. Particles of P-slag (< 1mm) were added to a synthetic medium with pH 6.5 and 8.5 at loading rates of 1, 10 and 100 mg/liter and the concentrations were measured after 7 days. In a similar way 1 mg/l was added to water with pH 5.5 and 8.5 and concentrations were measured after 28 days. In the solution containing 100 mg P-slag per liter, Si is the element detected at the highest level, around maximum 1 mg/l. Fluor is detected as well, at concentrations maximum circa 0.5 mg/l. With pH 8.5 the solved concentrations are almost half of the concentrations at pH 6.5. In the lower P-slag loading, Si and F concentrations were below detection levels. Concentrations of other elements were below the detection level (Fe < 0.25 mg/l, Al < 0.05 mg/l, Mn < 0.01 mg/l) in all P-slag loadings.
    • Hydrolysis: In accordance with of REACH Annex XI, A study on the hydrolysis as required in REACH Annex VIII, does not need to be conducted as the test substance is highly insoluble in water.
    • Partioning coefficient octanol-water.In accordance with column 2 of REACH Annex VII, the partition coefficient n-octanol/water study (required in section 7.8) does not need to be conducted as phosphorous slag is an inorganic substance.
    • Melting point;In accordance with REACH Annex XI, the Melting/freezing point study (required in section 7.2) does not need to be conducted as this test is technically not feasible. The melting point of phosphorous slags is estimated to be well above 1,000 degrees Celsius, based on melting during the production process at > 1000 C. Current OECD guidelines provide no methodology for determining melting points above 1,000 degrees Celsius. Due to the extreme requirements for testing the melting point of phosphorous slags and the fact that no guidelines for testing at these temperatures is available, we suggest that a test for this endpoint should be waived.
    • Boiling point: In accordance with column 2 of REACH Annex VII, the boiling point study (required in section 7.3) does not need to be conducted as the melting point of phosphorous slags is above 300 degrees Celsiu

    • Flashpoint: In accordance with column 2 of REACH Annex VII, the flash point study (required in section 7.9) does not need to be conducted as the substance is inorganic and the estimated flashpoint of phosphorous slag is above 200C, based on experience in the production process at > 1000 Celsius.
    • Flammability:In accordance with annex XI of REACH and guidance document R7 the flammability study required in annex VII of REACH , point 7.12 study can be waived based on structure considerations and experience in handling. Additionally, inorganic oxides in which the inorganic element is in its highest possible oxidation state are incapable of further reaction with oxygen and can thus be designated as non-flammable without further testing.
    • Explosiveness:In accordance with column 2 of REACH Annex VII, the explosiveness study (required in section 7.11) does not need to be conducted asphosphorous slag does not contain chemical groups indicating explosive properties (as mentioned in the ECHA endpoint specific guidance).
    •  Oxidising properties:In accordance with column 2 of REACH Annex VII, the oxidising properties study (required in section 7.13) does not need to be conducted as phosphorous slag does not contain oxygen or halogen atoms that are chemically bonded to nitrogen or oxygen atoms: it consists mainly of oxides itself. Thus according to Technical Guidance Document 7A it can be concluded beyond a reasonable doubt that sphosphorous slag is not an oxidizing solid capable of causing fire or enhancing the risk of fire when in contact with combustible material.