CAS 1314-56-3 · REACH · European Union

Phosphorus pentoxide (P2O5) under REACH

P2O5 (P4O10) · 五氧化二磷

Status: Registered. Phosphorus pentoxide is fully registered under REACH. **Distinguishing pattern: Production via combustion of yellow phosphorus batch 82 in dry air at ~300 C yielding P4O10 vapour, then condensed to crystalline P2O5 + alongside phosphorus chain (yellow P → P2O5 → H3PO4 thermal-process H3PO4 alternative to wet-process via phosphate rock) + drying / dehydrating agent in laboratory + chemical synthesis (cellulose dehydration, sugar fermentation, alkene polymerisation initiator, esterification catalyst) plus glass / ceramic flux plus phosphate-fertiliser P2O5-equivalent reporting unit plus fire-retardant downstream chains + moderate-to-high hazard profile (Skin Corr. 1A + Eye Dam. 1 + STOT SE 3 per harmonised CLP entry; verify exact harmonised classification against ECHA Annex VI to CLP Table 3.1 before relying).** NOT SVHC. NOT Annex XIV. NO active EU AD case on Chinese-origin P2O5 currently (verify against EUR-Lex https://eur-lex.europa.eu/ before invoicing).

Phosphorus pentoxide is fully REACH-registered with **moderate-to-high hazard profile** (Skin Corr. 1A + Eye Dam. 1 + STOT SE 3 + violent water-reaction). NOT SVHC, NOT Annex XIV. NO active EU AD. **Production via combustion of yellow phosphorus + alongside phosphorus chain** (yellow P → P2O5 → H3PO4 thermal-process). Drying / dehydrating agent + chemical synthesis + glass / ceramic flux + fire-retardant downstream chains. UN 1807 Class 8 PG II.

Listing and threshold

Substance Phosphorus pentoxide (P2O5) (CAS 1314-56-3), P2O5 (P4O10)
Regime EU Regulation (EC) No 1907/2006: Registration, Evaluation, Authorisation and Restriction of Chemicals
Jurisdiction European Union (EU-27 plus EEA: Iceland, Liechtenstein, Norway)
Status Registered
Tonnage threshold Registration required for any importer or manufacturer placing >1 t/year on the EU market

Classifications under this regime

  • Skin Corr. 1A (causes severe skin burns and eye damage): H314 per harmonised CLP (verify against ECHA Annex VI to CLP Table 3.1 before relying)
  • Eye Dam. 1: H318
  • STOT SE 3: H335
  • GHS pictograms: GHS05 (corrosion), GHS07 (exclamation)
  • IARC: Not classified
  • NOT subject to Drug Precursors or Explosives Precursors scheduling
  • ADR / RID: UN 1807 Class 8 PG II (corrosive)
  • **Reacts violently with water releasing heat** (forms phosphoric acid + heat)

Restrictions and conditions of use

  • NOT on REACH Annex XIV (verify against ECHA https://echa.europa.eu/authorisation-list)
  • NOT classified as SVHC (verify against ECHA https://echa.europa.eu/candidate-list-table)
  • NOT subject to any Annex XVII restriction
  • NO active EU AD case on Chinese-origin P2O5 currently (verify against EUR-Lex https://eur-lex.europa.eu/ before invoicing)
  • NOT in CBAM Phase 1 scope

Importer obligations

A non-EU producer cannot register directly under REACH. The EU importer of record must hold a registration or rely on an Only Representative (OR). Major Chinese P2O5 producers (typically integrated with phosphorus electric-arc furnace operations): Yunnan Yuntianhua, Guizhou Kailin Phosphate, Hubei Xingfa Group, Hubei Yihua, Wengfu Group; verify each producer-site pair against the producer's public website before relying on a specific plant.

Required documents

  • REACH registration number on EU side
  • SDS (Skin Corr. 1A + Eye Dam. 1 + STOT SE 3 hazard profile + violent water-reaction handling notes)
  • Customs entry HS code 280910 (phosphorus pentoxide)
  • ADR documentation for UN 1807 Class 8 PG II

Common compliance traps

The pitfalls that have bitten importers on this lane in the past. None of these is theoretical.

  • **Production: combustion of yellow phosphorus batch 82 in dry air at ~300 C; alternative thermal-process route to H3PO4**
  • **Alongside phosphorus chain (yellow P batch 82 → P2O5 → H3PO4 batch 64 thermal-process)**
  • Skin Corr. 1A + Eye Dam. 1 + STOT SE 3 + violent water-reaction (forms H3PO4 + heat)
  • NOT SVHC, NOT Annex XIV, NO active EU AD
  • **Drying / dehydrating agent + chemical synthesis (cellulose dehydration + sugar fermentation + alkene polymerisation + esterification catalyst) + glass / ceramic flux + phosphate-fertiliser P2O5-equivalent reporting unit + fire-retardant downstream chains**
  • Major Chinese producers (integrated with P electric-arc): Yunnan Yuntianhua, Guizhou Kailin, Hubei Xingfa, Hubei Yihua, Wengfu Group

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for phosphorus pentoxide (p2o5), see the CAS 1314-56-3 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the phosphorus pentoxide (p2o5) cornerstone hub covers the full sourcing chain.

For the structure and history of REACH, see the REACH glossary entry.

Need cross-jurisdiction compliance support on this substance? Run it through the REACH / TSCA / IECSC / AICIS / K-REACH checker, or send us the substance and the destination and we will quote FOB China and CIF / DDP landed including the regulatory work on the destination side.

Read next

Cross-jurisdiction profile and sourcing references

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