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Annex III Entry 3 17/10/2010

OXALIC ACID

Oxalic acid, its esters and alkaline salts

OXALIC ACID is listed in Annex III and may only be used under the conditions shown in this record. Maximum concentration in this record: 5%.

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Restricted substance— Annex III, EU Regulation 1223/2009
Max conc.: 5%
Entry: 3

Chemical identity and properties

PubChem 2D chemical structure for CAS 144-62-7
CAS 144-62-7PubChem CID 971

Oxalic Acid

Oxalic acid is an alpha,-dicarboxylic acid that is ethane substituted by carboxyl groups at positions 1 and 2. It has a role as a plant metabolite, a human metabolite and an algal metabolite. It is a conjugate acid of an oxalate and an oxalate(1-). — ChEBI

IUPAC name
oxalic acid
Molecular formula
C2H2O4
Molecular weight
90.03 g/mol
Exact mass
89.99530854 Da
XLogP3
-0.3
Topological polar surface area
74.6 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

ethanedioic acidAktisalAquisalOxiric acidKyselina stavelovaOxaalzuurOxalsaeureAcidum oxalicum
16 more reported names
Acide oxaliqueAcido ossalicoEthanedionic acidNCI-C55209Ethane-1,2-dioic acidNSC-62774Oxalic acid, anhydrous9E7R5L6H31CHEBI:16995Acid, Oxalichydron;oxalate2-oxo-2-oxonioacetateOxalic acid (aqueous)Oxalate, FerricOxalate, SodiumOxalate, Iron
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Maximum concentration

5%

Product type

Hair products

Other restrictions

Professional use

Warnings

For professional use only

INCI glossary name

OXALIC ACID

Chemical name

Oxalic acid, its esters and alkaline salts

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

Identified ingredients

Key data

CAS
144-62-7
EC
205-634-3
Annex
III
Entry number
3

Inventory links for OXALIC ACID

Inventory Restriction reference
Ref 33231

DIBUTYL OXALATE

CAS: 2050-60-4
EC: 218-092-8
Inventory Restriction reference
Ref 35766

OXALIC ACID

CAS: 144-62-7
EC: 205-634-3
Inventory Restriction reference
Ref 38007

SODIUM OXALATE

CAS: 62-76-0
EC: 200-550-3

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

Annex III 4
Nearby record in the same annex

AMMONIA

CAS: 7664-41-7 / 1336-21-6
EC: 231-635-3 / 215-647-6
Annex III 5
Nearby record in the same annex

Chloramine-T

CAS: 127-65-1
EC: 204-854-7

What Annex III means for OXALIC ACID

OXALIC ACID is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 10 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 11 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Ensure formulation concentration does not exceed: 5%
  • Confirm product type compatibility: Hair products
  • Include required warning statement on product label.
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

OXALIC ACID is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 144-62-7 is the unique numerical identifier assigned to OXALIC ACID 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.

The maximum concentration of 5% applies to the concentration of the substance in the ready-to-use cosmetic product. When the substance is supplied as part of a blend or mixture, the calculation must account for the contribution of all sources in the formulation. The combined concentration must not exceed the stated limit.

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 III record OXALIC ACID

This page summarizes one Annex III record for OXALIC ACID from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for OXALIC ACID, but confirm any final regulatory decision against the current official annex wording and source files.

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