What does the restriction note for SODIUM HYDROXIDE mean?

The restriction field for SODIUM HYDROXIDE reads: III/15a. This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

What other records share CAS 1310-73-2?

CAS 1310-73-2 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

InventoryRef 3789015/10/2010

SODIUM HYDROXIDE

Q: How do I check if my formula contains SODIUM HYDROXIDE?

Use the INCI Checker tool on CosIng Checker to paste your full ingredient list and scan it against all EU annex records and allergen flags in one step.

Sodium hydroxide

SODIUM HYDROXIDE is linked to 1 EU annex record on this page. Inventory note: III/15a.

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Inventory details for SODIUM HYDROXIDE

INCI name

SODIUM HYDROXIDE

INN name

sodium hydroxide

Ph. Eur. name

natrii hydroxidum

Description

Sodium hydroxide

Annex records for SODIUM HYDROXIDE

Annex III Restriction reference

Entry 15a

POTASSIUM HYDROXIDE / SODIUM HYDROXIDE

CAS: 1310-58-3 / 1310-73-2

EC: 215-181-3 / 215-185-5

Key data

CAS

1310-73-2

215-185-5

Restriction

III/15a

Function

BUFFERING DENATURANT

How SODIUM HYDROXIDE appears in the CosIng inventory

The CosIng inventory lists SODIUM HYDROXIDE as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

SODIUM HYDROXIDE is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

SODIUM HYDROXIDE appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for SODIUM HYDROXIDE reads: "III/15a". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, SODIUM HYDROXIDE carries the following function designation(s):

CAS 1310-73-2 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

View CAS records

Use the INCI Checker tool to paste your full ingredient list and scan it against all EU annex records and allergen flags in one step.

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Source note for SODIUM HYDROXIDE

This page combines the CosIng inventory entry for SODIUM HYDROXIDE with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research SODIUM HYDROXIDE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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Scan a full INCI list to detect SODIUM HYDROXIDE and any linked EU annex restrictions or allergen flags.

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Search similar ingredients

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