CAS number
CAS 7778-39-4 Arsenic acid
CAS 7778-39-4 · EC 231-901-9
Where CAS 7778-39-4 appears: every table entry that prints it among its identifiers, in the newest version of each act this record holds, and every recorded change to those entries. Many entries name a group of substances and print no number, so absence here is not absence from the law. Not legal advice.
Where it appears now
PIC Regulation Annex I, the entry for Arsenic acid
Last changed in the version in force , by Regulation (EU) 2026/1278, the act that change names · Annex I on this site
| Chemical | CAS No | EC No | CN code | Subcategory | Use limitation | Countries for which no notification is required |
|---|---|---|---|---|---|---|
| Arsenic acid | 7778-39-4 | 231-901-9 | ex28111980 | i(2) | sr |
REACH Annex XIV, Entry 24
Last changed in the version in force , by Regulation (EU) No 895/2014, the act that change names · Annex XIV on this site
| Entry Nr | Substance | Intrinsic property(ies) referred to in Article 57 | Transitional arrangements | Exempted (categories of) uses | Review periods | |
|---|---|---|---|---|---|---|
| Latest application date | Sunset date | |||||
| 24. | Arsenic acid EC No: 231-901-9 CAS No: 7778-39-4 | Carcinogenic (category 1A) | 22 February 2016 | 22 August 2017 | — | — |
Look up a number
Type a CAS or EC number, with or without its hyphens, or an Index No into the search box at the top of the page: it reads 50000 as CAS 50-00-0. Every number is also listed by act on the substances page.
Its history
· added · PIC Regulation Annex I, the entry for Arsenic acid
Recorded in the version in force , by Regulation (EU) 2026/1278, the act that change names. The change on its version page
| Identifiers | Chemical | CAS No | EC No | CN code | Subcategory | Use limitation | Countries for which no notification is required |
|---|---|---|---|---|---|---|---|
| Arsenic acidCAS 7778-39-4EC 231-901-9 | Arsenic acid | 7778-39-4 | 231-901-9 | ex28111980 | i(2) | sr |
· added · REACH Annex XIV, Entry 24
Recorded in the version in force , by Regulation (EU) No 895/2014, the act that change names. The change on its version page
| Identifiers | Entry Nr | Substance | Intrinsic property(ies) referred to in Article 57 | Transitional arrangements | Exempted (categories of) uses | Review periods | |
|---|---|---|---|---|---|---|---|
| Latest application date | Sunset date | ||||||
| Entry 24CAS 7778-39-4EC 231-901-9 | 24. | Arsenic acid EC No: 231-901-9 CAS No: 7778-39-4 | Carcinogenic (category 1A) | 22 February 2016 | 22 August 2017 | — | — |
Sources
- PIC Regulation: every version the record holds; rows read from EUR-Lex consolidated version 02012R0649-20261001, in force 1 October 2026 (external, EUR-Lex)
- REACH: every version the record holds; rows read from EUR-Lex consolidated version 02006R1907-20260622, detected 11 September 2026 (external, EUR-Lex)