chem-data European chemical and regulatory registry

Compound record

Magnesium hydroxide

Also known as MgO2

1309-42-8 · mineral flame retardant · flame retardant

flame retardantcablespolyolefins
Dossier

Identity-first dossier for exact-name, CAS, and use-context lookups.

Lookup labels

MgO2 MAGNESIUM HYDROXIDEMilk of magnesiaMagnesium dihydroxide
Dossier Status Obligations Why Alternatives Changes Similar Sources
CAS 1309-42-8
Formula H2MgO2
Molecular weight 58.32 g/mol
InChIKey VTHJTEIRLNZDEV-UHFFFAOYSA-L

Current EU status

Regulatory snapshot for Magnesium hydroxide

Magnesium hydroxide is currently surfaced as no current candidate list row imported in the EU.

The current imported view anchors this substance in CandidateList. The live rationale focuses on No positive Candidate List entry captured in the current imported source set, and this page is designed for fast status checks before deeper source review.

Searchers usually land here for the chemical name, CAS number, abbreviation MgO2, and the question of whether the substance is tied to SVHC, REACH, POPs, or SCIP-style compliance work.

No current Candidate List row importedcurrent statuslatest imported framework state
8 Mar 2026latest anchor datelisted, effective, or checked date

Identity

CAS, formula, aliases, and use context

Fast lookup

CAS 1309-42-8 · Formula H2MgO2 · Molecular weight 58.32 g/mol · Current status No current Candidate List row imported

If you landed here for formula, molecular weight, or exact substance identity, this block gives the shortest route before you branch into status, obligations, or sources.

CAS
1309-42-8
EC
215-170-3
Formula
H2MgO2
Molecular weight
58.32 g/mol
Primary class
mineral flame retardant
Synonym count
136

Search-friendly summary

Magnesium hydroxide (MgO2) , CAS 1309-42-8, is tracked here as a flame retardant substance in the mineral flame retardant class.

Common names and aliases

MAGNESIUM HYDROXIDEMilk of magnesiaMagnesium dihydroxideMagnesium hydrateMagnesium hydroxide (Mg(OH)2)Magnesium(II) hydroxide

What to do next

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Status

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Go here for the framework answer block, listed dates, reasons, and the imported basis for the current EU status.

 Obligations

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 Why monitored

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 Alternatives

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 Changes

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 Sources

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Action prompts

Fast compliance and screening routes

Article duties

Check Candidate List threshold and SCIP relevance

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 Portfolio review

Screen affected product families and formulations

The use profile suggests this substance can appear in materials portfolios where one listing can ripple across multiple SKUs, suppliers, or component bills.

 Source check

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Every summary should point back to the underlying authority surface. Use the source route when the exact notice, registry entry, or legal text matters.