chem-data European chemical and regulatory registry

Compound record

Aluminum hydroxide

Also known as C 31C

21645-51-2 · mineral flame retardant · flame retardant

flame retardantmineral fillercables
Dossier

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

Lookup labels

C 31C Hydrated aluminaAmphojelaluminum hydrate
Dossier Status Obligations Why Alternatives Changes Similar Sources
CAS 21645-51-2
Formula AlH3O3
Molecular weight 78.004 g/mol
InChIKey WNROFYMDJYEPJX-UHFFFAOYSA-K

Current EU status

Regulatory snapshot for Aluminum hydroxide

Aluminum 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 C 31C, 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 21645-51-2 · Formula AlH3O3 · Molecular weight 78.004 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
21645-51-2
EC
244-492-7
Formula
AlH3O3
Molecular weight
78.004 g/mol
Primary class
mineral flame retardant
Synonym count
158

Search-friendly summary

Aluminum hydroxide (C 31C) , CAS 21645-51-2, is tracked here as a flame retardant substance in the mineral flame retardant class.

Common names and aliases

Hydrated aluminaAmphojelaluminum hydrateDried aluminium hydroxideAluminum hydroxide, driedALternaGEL

What to do next

Use the right route for status, SCIP, and source questions

Status

Current legal state, Candidate List signals, and source-backed rationale

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

 Obligations

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Use this when the question is operational: SCIP, article communication, threshold review, portfolio screening, or substitute work.

 Why monitored

Why this substance is monitored in the EU

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 Alternatives

Potential substitutes and nearby molecules

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 Changes

What changed over time

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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

Use this when the substance may sit in articles, components, or imported goods and you need to confirm communication and SCIP workflows.

 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

Verify the legal source before repeating the claim

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