Safety data sheet reference · CAS 1310-73-2
Sodium hydroxide SDS
also: sodium hydroxide MSDS · safety data sheet · NaOH · CAS 1310-73-2 · EC 215-185-5 · caustic soda · lye
Official PDF from supplier
This page is a reference, not the legal document.
CAS number
1310-73-2
EC number
215-185-5
CLP Annex VI index
011-002-00-6
Molecular formula
HNaO
Molar mass
39.997 g/mol
§ 02 · Hazards identification
Harmonised EU classification
CLP Annex VI · Index 011-002-00-6. A supplier SDS may add self-classified hazards — this is the legal minimum.
Precautionary statements
§ 07 · Handling and storage
Computed storage verdict
Derived from CLP Annex VI classification and CAMEO reactive-group data — not copied from a PDF.
⚠ Strong Reducing Agent⚠ Water-Reactive
⛔ Never store with
↔ Keep separate
Full interactive verdict — reactions, gas release on contact, ADR forms →
§ 09 · Physical and chemical properties
Measured properties
The full physical-property table (melting/boiling point, flash point, explosion limits, vapour pressure, density) is being populated for this substance from ECHA registration data and will appear here as it lands.
§ 10 · Stability and reactivity
Reactive group (CAMEO/NOAA): Bases, Strong, Metal Hydrides, Metal Alkyls, Metal Aryls, and Silanes, Water and Aqueous Solutions. Our database documents 103 incompatible and 48 caution reaction-partner groups for sodium hydroxide — including which combinations release gas on contact. See the per-partner breakdown with gas release →
103
Incompatible
48
Caution
§ 13 · Disposal considerations
Dispose of waste and residues in accordance with local and national regulations — in the EU under the Waste Framework Directive 2008/98/EC. Never discharge to drains or municipal waste; hand contaminated packaging and unused product to an authorised waste-disposal company. The supplier's SDS section 13 lists the applicable waste codes for the specific product.
§ 14 · Transport information
Road transport — ADR 2025
UN number
UN 1823
Proper shipping name
SODIUM HYDROXIDE, SOLID
Class · PG
8 · II
Classification code
C6
Transport category
2
ADR labels
8
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
UN number
UN 1824
Proper shipping name
SODIUM HYDROXIDE SOLUTION
Class · PG
8 · II
Classification code
C5
Transport category
2
ADR labels
8
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
UN number
UN 1824
Proper shipping name
SODIUM HYDROXIDE SOLUTION
Class · PG
8 · III
Classification code
C5
Transport category
3
ADR labels
8
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
Source: UN ADR 2025 (ECE/TRANS/352), Table A. Road (ADR) only — for sea (IMDG) and air (IATA), consult the supplier's SDS §14.
MSDS vs SDS
MSDS vs SDS: is there a difference?
MSDS (Material Safety Data Sheet) is the older name for the same document. In the US, OSHA's Hazard Communication Standard (2012) adopted the GHS-standardised 16-section Safety Data Sheet; in the EU the format is set by REACH Annex II. So a "sodium hydroxide MSDS" and a "sodium hydroxide SDS" refer to the same document — today it is issued as an SDS. Full breakdown of the differences →
Other bases in our database
Compliance hub
From classification to SDS
The classification above corresponds to Section 2 of a Safety Data Sheet. Learn how a compliant 16-section SDS is structured and authored →
GHS label maker
Build the label for sodium hydroxide
Pictograms, signal word and H-statements combined into a compliant label layout →
§ 16 · Sources
- Classification: Regulation (EC) No 1272/2008 (CLP), Annex VI
- Transport: UN ADR 2025 (UNECE), Table A
- Reactivity: NOAA CAMEO Chemicals reactive-group matrix (public domain)
- Substance data: PubChem · ECHA
Reference aid only. This page summarises the harmonised EU classification and computed storage guidance — it is not a Safety Data Sheet and does not replace one. Always verify hazards, handling and storage against the supplier's SDS (sections 7 and 10) and local regulations before use. Page updated 2026-07-27.
Frequently asked questions
Is an MSDS the same as an SDS?
In practice, yes. MSDS (Material Safety Data Sheet) is the older name for the same document. In the US, OSHA's Hazard Communication Standard (2012) adopted the GHS-standardised 16-section Safety Data Sheet; in the EU the SDS format is set by REACH Annex II. A document you find labelled "sodium hydroxide MSDS" is today issued as an SDS.
What GHS pictograms does sodium hydroxide require?
Under the harmonised EU classification (CLP Annex VI), sodium hydroxide carries GHS05 with the signal word "Danger". Hazard statements: H314. A supplier's SDS may add self-classified hazards on top of this harmonised minimum.
What should sodium hydroxide never be stored with?
Based on its storage class (Bases), sodium hydroxide must not share storage with: Mineral acids; Organic acids; Oxidizing acids; Water-reactives. Verify against the supplier's SDS sections 7 and 10 before finalising storage.
Where can I download an official sodium hydroxide SDS PDF?
From your own supplier — an SDS is issued per product and supplier, so the correct PDF for an inspection is the one matching the product you actually purchased. The supplier links on this page lead to the official SDS libraries of major distributors.