EU cosmetic ingredients, restrictions and safety

Annex II Entry 1394 CMR30/07/2020

Diboron trioxide; boric oxide

Diboron trioxide; boric oxide is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.

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Prohibited substance— Annex II, EU Regulation 1223/2009

Entry: 1394

CMR

Record details

Chemical name

Diboron trioxide; boric oxide

Chemical / IUPAC name

Diboron trioxide; boric oxide

Regulatory information

Regulation

(EU) 2019/831

CMR

Category	Carcinogenic	Mutagenic	Reprotoxic
Cat. 1B	—	—	✓

Key data

CAS

EC

Annex

Entry number

1394

Direct matches are limited for this record, so nearby entries from Annex II are shown as well.

Annex II 1393

Nearby record in the same annex

N-Methyl-2-pyrrolidone; 1-methyl-2-pyrrolidone

CAS: 872-50-4

EC: 212-828-1

Annex II 1395

Nearby record in the same annex

Boric acid [1]; Boric acid [2]

CAS: 10043-35-3 [1] 11113-50-1 [2]

EC: 233-139-2 [1] 234-343-4 [2]

Annex II 1392

Nearby record in the same annex

1-Cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

CAS: 93107-30-3

EC: 413-760-7

Annex II 1396

Nearby record in the same annex

Borates, tetraborates, octaborates and boric acid salts and esters, including: Disodium octaborate …

CAS: 12008-41-2 [1]/ 12280-03-4 [2]/ 10377-81-8 [3]/ 68003-13-4 [4]/ 12712-38-8 [5]/ -[6]/ 1332-07-6 [7]/ 1330-43-4 [8]/ 12267-73-1 [9]/ 13840-56-7 [10]/ 1303-96-4 [11]/ 12179-04-3 [12]

EC: 234-541-0 [1]/ 234-541-0 [2]/ 233-829-3 [3]/ 268-109-8 [4]/ 603-184-6 [5]/ -[6]/ 215-566-6 [7]/ 215-540-4 [8]/ 235-541-3 [9]/ 237-560-2 [10]/ 215-540-4 [11]/ 215-540-4 [12]

Annex II 1391

Nearby record in the same annex

Acetaldehyde; ethanal

CAS: 75-07-0

EC: 200-836-8

Annex II 1397

Nearby record in the same annex

Perboric acid (H3BO2(O2)), monosodium salt trihydrate [1] Perboric acid, sodium salt, tetrahydrate …

CAS: 13517-20-9 [1], 37244-98-7 [2], 10486-00-7 [3], — [4], 15120-21-5 [5], 7632-04-4/10332-33-9/10486-00-7 [6], 11138-47-9 [7], 12040-72-1 [8], 10332-33-9 [9], 121-43-7 [10]

EC: 239-172-9 [1], 234-390-0 [2], — [3], — [4], 239-172-9 [5], 231-556-4 [6], 234-390-0 [7], 234-390-0 [8], — [9], 204-468-9 [10]

Annex II 1390

Nearby record in the same annex

2,2'-((3,3',5,5'-Tetramethyl-(1,1'-biphenyl)-4,4'-diyl)-bis(oxymethylene))-bis-oxirane

CAS: 85954-11-6

EC: 413-900-7

Annex II 1400

Nearby record in the same annex

Dibutyltin hydrogen borate

CAS: 75113-37-0

EC: 401-040-5

Annex II 1389

Nearby record in the same annex

Dichloromethane; methylene chloride

CAS: 75-09-2

EC: 200-838-9

Annex II 1401

Nearby record in the same annex

Nickel bis(tetrafluoroborate)

CAS: 14708-14-6

EC: 238-753-4

Annex II 1388

Nearby record in the same annex

Octamethylcyclotetrasiloxane; D4

CAS: 556-67-2

EC: 209-136-7

Annex II 1402

Nearby record in the same annex

Mancozeb (ISO); manganese ethylenebis(dithiocarbamate) (polymeric) complex with zinc salt

CAS: 8018-01-7

EC: 616-995-5

What Annex II means for Diboron trioxide; boric oxide

Diboron trioxide; boric oxide is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009. No concentration limit applies — the presence of this substance in any cosmetic product placed on the EU market is not permitted regardless of use level.

Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.

The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

Verify this substance is absent from all raw materials and finished formulations.
Request absence confirmation or CoA from raw material suppliers.
Document the screening result in the Product Information File (PIF).
This substance has CMR classification. Review the CMR table above and verify current Annex II/III status before use.

Frequently asked questions

Yes. Diboron trioxide; boric oxide is listed in Annex II of EU Cosmetics Regulation 1223/2009 as a prohibited substance. It must not be present in any cosmetic product placed on the EU market at any concentration.

CAS 1303-86-2 is the unique numerical identifier assigned to Diboron trioxide; boric oxide by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

Diboron trioxide; boric oxide has a CMR (carcinogenic, mutagenic or reprotoxic) classification under EU CLP Regulation. Under Article 15 of EU Cosmetics Regulation 1223/2009, CMR substances of category 1A or 1B are prohibited in cosmetics unless specifically permitted. Category 2 CMR substances may be used only if assessed safe by the SCCS. Always verify current annex status and any applicable derogations before use.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.

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Source note for Annex II record Diboron trioxide; boric oxide

This page summarizes one Annex II record for Diboron trioxide; boric oxide from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex II conditions for Diboron trioxide; boric oxide, but confirm any final regulatory decision against the current official annex wording and source files.

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