Ingredient source facts

SODIUM HYDROXIDE: EU cosmetic annex conditions and formula evidence

SODIUM HYDROXIDE has identifier matches to Annex III in the acquired 18 May 2026 EU Cosmetics Regulation text. The table distinguishes the substance identity, product-use conditions and recorded limits. Confirm the exact substance/group scope, formula concentration and intended use before applying an entry. This does not certify formula safety or settle Great Britain requirements. The informative CosIng metadata and legal-table references differ; this page does not treat them as interchangeable.

Evidence retrieved 2026-10-06. Source versions and topic-specific limits are listed below.

Exact legal-entry matches and product-use conditions

Exact checksum-valid CAS and/or exact EC identifier in preserved legal identity cells. Group and substance scope are still conditional.

Each line below retains its own concentration basis, conditions and warnings. Blank source cells mean no condition was recorded in that cell; they do not establish unrestricted use.

Annex III · Entry 15a

Recorded identity: Potassium or sodium hydroxide ( 20 )

Matching CAS: 1310-73-2 · Matching EC: 215-185-5

Product use / body siteMaximum concentration and basisOther conditionsWarningsSource
(a) Nail cuticle solvent(a) 5 % ( 4 )Blank in source(a) Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children[2]
(b) Hair straightener2 % ( 4 )General useContains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children[2] [5]
(b) Hair straightener4,5 % ( 4 )Professional useFor professional use only Avoid contact with eyes Can cause blindness[2] [5] [6]
(c) pH adjuster for depilatoriesBlank in source(c) pH < 12,7(c) Keep out of reach of children Avoid contact with eyes[2] [7]
(d) Other uses as pH adjusterBlank in source(d) pH < 11Blank in source[2] [8]

Linked notes for this entry

  • ►M13 ( 4 ) The quantity of sodium, potassium or lithium hydroxide is expressed as weight of sodium hydroxide. In cases of mixtures, the sum should not exceed the limits given in column g. ◄ [3]
  • ►M13 ( 20 ) For other uses of potassium hydroxide, see Annex III, No 15d. ◄ [4]

The consolidated text is a dated reference. Current amendments, corrigenda and applicability dates must be checked. EU evidence does not resolve Great Britain rules.

Known facts and deciding inputs

Known context: EU. Ingredient identity is recorded; concentration, intended use, exposure and current legal conditions still need checking.

Source factRecorded valueWhat to check
INCI / recorded nameSODIUM HYDROXIDE [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
Common ingredients glossary nameSODIUM HYDROXIDE [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
CAS identifiers1310-73-2 [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
EC identifiers215-185-5 [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
Informative CosIng functionsBUFFERING, DENATURANT [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
Chemical nameSodium hydroxide [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.
CosIng annex referenceIII/15a [1]Check identity, concentration, exposure and use against the current legal annex and any amendments.

Resolve the entry against your actual formula

Use this checklist to gather your business or product details before speaking with a specialist. The items below explain what to record and suggest useful supporting documents. You can add your own answers in the editable project brief.

  1. Does the supplied material fall within these exact entries?

    Put your supplier CAS/EC, substance composition, salt/group membership, purity, physical form and intended function beside each matched entry. A matching identifier does not resolve every group or impurity condition.

    Useful evidence: Supplier specification, composition and certificates of analysis; the exact annex rows above.

  2. Which row governs the finished-product use?

    Compare the finished-product concentration, body site, rinse-off/leave-on use, consumer/professional setting and any exposure restrictions with each row. Preserve the units and calculation basis; do not transfer a limit from a different product-use row.

    Useful evidence: Quantitative formula and use instructions; a row-by-row condition and warning worksheet.

  3. Is a prohibition or trace question involved?

    For Annex II matches, review Article 14 before formulation decisions. Article 17 concerns a separate, conditional non-intended trace situation; it does not grant blanket permission to intentionally add a prohibited substance. Record origin and technical-avoidability evidence for specialist review.

    Useful evidence: Ingredient/impurity origin, manufacturing controls, trace quantities and the cited Article 17 text.

  4. What must reach the safety assessor and Responsible Person?

    Send the reconciled identity, condition table, exposure facts, supplier evidence and unresolved amendment/date questions. Agree formula, assessment and PIF responsibilities before notification or manufacturing handoff.

    Useful evidence: A dated formula-evidence matrix, supplier data, exposure description and document ownership list.

Work packages and dependencies

What needs to happen first

Questions for providers

Sources and data dates

Read the official document in context. The audit details identify the precise locators and preserved versions used for this page.

EUR-Lex — Regulation (EU) 2009/1223 ↗

Consolidated text dated 2026-05-18 · retrieved 2026-10-06

Audit details: precise locators and snapshot identifiers

Source key D05 · snapshot fc7ca1c1b06e5052fbfd81afd57c8ba69d4c215a4fc4a2a8385b9bff94a7b591

  • [2] HTML table[2] in substantive document container (extraction legal-html-tables-2) / own tr[53] · record 011e38017d1e6f4e7b04a5c75817701016f27d932482e07a68738081465f5334
  • [3] #E0023 / containing div (linked annex note) · record d3048c1fea1cc2640a7ba5a691bffd5248bd3391d5bb4f09a0a554f72a0ed0f5
  • [4] #E0039 / containing div (linked annex note) · record d6dec3f7fd609179a074126394028c6cd04bbd10831344fe0382777c7bdb4ae1
  • [5] HTML table[2] in substantive document container (extraction legal-html-tables-2) / own tr[54] · record b679be78c0de8dd346a5ea00e1dbf2cfcd614bd4c854f32d2ca4544ce7f2c1db
  • [6] HTML table[2] in substantive document container (extraction legal-html-tables-2) / own tr[55] · record 30d35b76a1c157c394e82e84878d299e815fd6a3a53fbe82a228641b272f2695
  • [7] HTML table[2] in substantive document container (extraction legal-html-tables-2) / own tr[56] · record 276cb60a246724339e0f0997a9a4fb6c22a066b5ea867ad83dda7494db1dd2e0
  • [8] HTML table[2] in substantive document container (extraction legal-html-tables-2) / own tr[57] · record 5908190f015a42510b7ce96feeb703412029c797bb91dd429ca292003a1f8e27
  • [9] #art_14 · record 9ffeb5c563a32fe8d532de5d352c05f8a9062e1c5d21fd326d5e6c2ea42a84f4
  • [10] #art_17 · record 8ad3194ae1fc45e70495aa637f90457139a0023680e2b880fc4c8a8b4d202c43
  • [11] #art_10 · record 49eb173406b736d6f0b855572abc53b0f52d9543a4d170affa8ae68d6e809718
  • [12] #art_11 · record ba70c2a84c1d6c70eb57a0fd892fcdf584f6142281b03c29be4bd20e6e83844d

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