Registration Dossier
Registration Dossier
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EC number: 215-170-3 | CAS number: 1309-42-8
Endpoint summary
Administrative data
Description of key information
According to Annex X of REACH Regulation 1907/2006, studies on terrestrial toxicity do not need to be conducted if an initial assessment using equilibrium partitioning does not indicate a concern. Reported results on the physico-chemical properties of Magnesium hydroxide show that the substance is only slightly soluble in water (1.78 mg total solids/L at 8.3 pH and 20ºC) and has a low potential to adsorb to sediment (derived sediment-water partition coefficient (Kd) 1.65). Furthermore, Magnesium hydroxide is expected to break down in the environment to water and Magnesium over time. Magnesium is ubiquitous in the environment and is an essential plant and animal nutrient. Magnesium hydroxide does not meet the criteria to be classified as dangerous under the CLP Regulation (EC) No 1272/2008 nor does it meet the criteria to be classified as persistent, bioaccumulative or toxic under the REACH Regulation. Taking into consideration the physico-chemical properties, supporting studies, breakdown pathway and the low adsorption to sediment, Magnesium hydroxide is not considered to pose a risk to terrestrial animals and plants.
According to Annex X of REACH Regulation 1907/2006, this study does not need to be conducted if the available data on mammalian species show no significant effect. In the section 6 of IUCLID it is shown that Magnesium hydroxide does not meet the criteria to be classified as dangerous under the CLP Regulation (EC) No 1272/2008 nor does it meet the criteria to be classified as persistent, bioaccumulative or toxic under the REACH Regulation. Magnesium hydroxide is expected to break down in the environment to water and Magnesium over time. Magnesium is ubiquitous in the environment and is an essential plant and animal nutrient. Taking into consideration the physico-chemical properties, available studies wth mammalian species, breakdown pathway and the low adsorption to sediment, Magnesium hydroxide is not considered to pose a risk to birds.
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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