Compound record

Tetrabromophthalic anhydride

Also known as PHT 4

632-79-1 · aromatic brominated flame retardant · flame retardant

PHT 4 flame retardantreactive usepolyesters BromphthalFireMaster PHT 4Bromophthal

Dossier Status Obligations Why Alternatives Changes Similar Sources

CAS 632-79-1

Formula C8Br4O3

Molecular weight 463.7 g/mol

InChIKey QHWKHLYUUZGSCW-UHFFFAOYSA-N

Current EU status

Regulatory snapshot for Tetrabromophthalic anhydride

Tetrabromophthalic anhydride 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 PHT 4, 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

CAS: 632-79-1
EC: 211-185-4
Formula: C8Br4O3
Molecular weight: 463.7 g/mol
Primary class: aromatic brominated flame retardant
Synonym count: 76

Search-friendly summary

Tetrabromophthalic anhydride (PHT 4) , CAS 632-79-1, is tracked here as a flame retardant substance in the aromatic brominated flame retardant class.

Common names and aliases

BromphthalFireMaster PHT 4BromophthalTetrabromophthalic acid anhydridePhthalic anhydride, tetrabromo-1,3-Isobenzofurandione, 4,5,6,7-tetrabromo-

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

Who needs to act, what to check, and whether SCIP matters

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

Use this when you want the hazard or legal basis behind the current status, not just the status label itself.

Alternatives

Potential substitutes and nearby molecules

Use this to branch into lower-pressure neighbors, same-class analogs, and candidate-list peers.

Changes

What changed over time

Use this when you want the timeline, not just the current state.

Sources

Verify where the data came from

Use this when you need to audit provenance before trusting a claim.

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.

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.