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EC number: 285-561-1 | CAS number: 85117-09-5 Mixtures of chemical substances produced by burning (below 1200°C) natural variants of limestone or chalk containing from 10 to 20%, or more, of clayey or siliceous materials which are predominantly SiO2, Al2O3 and iron oxide. Consist primarily of 2CaOsb.2, Ca(OH)2, CaO and 2CaOsb.2O3. 3CaO.2SiO2, 4CaOsb.2O3. Fe2O3, 2CaOsb.2O3sb.2, CaCO3 and SiO2 may also be included.
Endpoint summary
Administrative data
Description of key information
Additional information
Appearance/physical state/colour: Lime (chemical) hydraulic is a grey powder at room temperature (GLP study report).
Melting point: > 450 °C (study result, EU A.1 method).
Boiling point: This study does not need to be conducted for solids with a melting point above 300 °C (melting point of this substance: > 450 °C) (cf. section 7.3 Column 2 Annex VII of Regulation (EC) 1907/2006).
Relative density (compared to water at 4 °C) is D4R= 2.70 (22.0 °C) (study result, EU A.3 method). The deviation from the nominal temperature (20 °C) does not significantly affect the accuracy of the density value.
Particle size distribution (Granulometry): Total Dustiness (airborne fraction): 69.11 mg/g (experimental result). Mass median aerodynamic diamaters (bimodal distribution) of airborne fraction: MMAD1 = 6.68 µm (54.0 %) , MMAD2 = 32.21 µm (46 %) (distribution fitted to cascade impactor data, percentage in parentheses indicates weighting factor). Geometric standard deviation: GSD1 = 1.97 µm, GSD 2 = 1.10 µm Fractional deposition in human respiratory tract (MPPD model, based on the MMAD): Head (ET): 63.9 %; Tracheobronchial (TB): 0.9 %; Pulmonary (PU): 2.3 %
Vapour pressure: This study does not need to be conducted for solids with a melting point above 300 °C (melting point of this substance: > 450 °C) (cf. section 7.5 Column 2 Annex VII of Regulation (EC) 1907/2006).
Partition coefficient: This study generally does not need to be conducted for inorganic substances (cf. section 7.8 Column 2 Annex VII of Regulation (EC) 1907/2006).
Water solubility: The water solubility has been determined for calcium and three further elements forming impurities of lime (chemical) hydraulic. The water solubilities of these four elements were determined as follows: 1) 1010 mg calcium/L at 20.0 ± 0.5 °C; 2) 0.158 mg aluminium/l at 20.0 ± 0.5 °C; 3) 0.305 mg silicon/l at 20.0 ± 0.5 °C; 4) 0.115 mg iron /l at 20.0 ± 0.5 °C (study result, modified EU A.6 method).
An exact water solubility of lime (chemical) hydraulic cannot be determined since the molecular formula of the test item is unknown. However, since calcium hydroxide is the main component of the test material it can be assumed that the calcium concentration sufficiently accurately reflects the solubility of the test item in water. In conclusion, lime (chemical) hydraulic is soluble in water.
Surface tension: This study only needs to be conducted if, based on the structure, surface activity is expected or can be predicted, which is not the case for this substance: Lime (chemical) hydraulic mainly consists of Ca(OH)2, and contains a few inorganic impurities. Therefore, the substance is not known to exhibit structures involved in surface activity (hydrophilic head group and hydrophobic tail) (cf. section 7.6 Column 2 Annex VII of Regulation (EC) 1907/2006).
Flash point: This study is only relevant for liquids or low melting point solids, which is not the case for this substance. Further, this study generally does not need to be conducted for inorganic substances (cf. section 7.9 Column 2 Annex VII of Regulation (EC) 1907/2006).
Auto-flammability: The test material showed no relative self-ignition temperature below 400 °C (study result, EU A.16 method).
Flammability: Non-flammable (study result, EU A.10 method)
Explosiveness: According to the provisions of EU A.14 method, expert judgement considered the test substance to be void of any chemical structures commonly associated with explosive properties.
Oxidising properties: According to the provisions of EU A.17 method, expert judgement considered the test substance as a not oxidising substance.
Stability in organic solvents and identity of relevant degradation products: This study does not need to be conducted for inorganic substances (cf. section 7.15 Column 2 Annex IX of Regulation (EC) 1907/2006).
Dissociation constant: In accordance with section 1, Annex XI of Regulation (EC) 1907/2006 (REACH), this study does not need to be conducted. This property is applicable only for ionisable organic substances. Lime (chemical) hydraulic is an inorganic material mainly consisting of Ca(OH)2, which reacts with water to give a solution of calcium and hydroxide ions. Therefore, when dissolved in water, the substance is completely ionised into Ca2+ and OH- ions. Mineral impurities may also be dissolved to a minor degree. The concept of dissociable functional groups is therefore not applicable. Therefore, the determination of a dissociation constant is not considered to be required (ECHA Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance, section R.7.1.17).
Viscosity: Viscosity is a property of liquids. Since lime (chemical) hydraulic is a solid at ambient temperature (ca. 20 °C) such a study does not need to be conducted for this substance (melting point:> 450 °C) (in accordance with section 1, Annex XI of Regulation (EC) 1907/2006 (REACH)) .
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