Substance profile
Sodium peroxide
Sodium peroxide is a yellowish-white, granular powder.
01 · Identification
What Sodium peroxide is
Sodium peroxide is a yellowish-white, granular powder. Its molecular formula is Na2O2 and its molecular weight is 77.978 g/mol. It boils at 657 °C, melts at 460 °C, is soluble in water.
Under the GHS it carries the signal word Danger. It is classed as reactive agents - 1st degree.
02 · Identifiers
Sodium peroxide identifiers and molecular data
Sodium peroxide CAS number and EC number
Sodium peroxide molecular formula and molecular weight
03 · GHS classification
Sodium peroxide hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Sodium peroxide pictograms and signal word
Sodium peroxide hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Oxidising liquids or Oxidising solids | Category 1 | H271 | GHS03 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Sodium peroxide hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H271 | May cause fire or explosion; strong oxidiser. |
| H314 | Causes severe skin burns and eye damage. |
This page lists only the codes assigned to Sodium peroxide. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Sodium peroxide
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Sodium peroxide issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Sodium peroxide precautionary statements
CLP Annex VI assigns 5 precautionary statements to Sodium peroxide. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Sodium peroxide name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | натриев пероксид |
| Spanish español | Peróxido de sodio |
| Czech čeština | peroxid sodný |
| Danish dansk | natriumperoxid |
| German Deutsch | Natriumperoxid |
| Estonian eesti | naatriumperoksiid |
| Greek ελληνικά | υπεροξείδιο του νατρίου |
| English English | sodium peroxide |
| French français | peroxyde de sodium |
| Croatian hrvatski | natrijev peroksid |
| Italian italiano | perossido di sodio |
| Latvian latviešu | nātrija peroksīds |
| Lithuanian lietuvių | natrio peroksidas |
| Hungarian magyar | nátrium-peroxid |
| Maltese Malti | perossidu tas-sodju |
| Dutch Nederlands | natriumperoxide |
| Polish polski | nadtlenek sodu |
| Portuguese português | peróxido de sódio |
| Romanian română | peroxid de sodiu |
| Slovak slovenčina | peroxid sodný |
| Slovenian slovenščina | natrijev peroksid |
| Finnish suomi | natriumperoksidi |
| Swedish svenska | natriumperoxid |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Sodium peroxide GHS label elements
Everything CLP Annex VI fixes for Sodium peroxide, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Sodium peroxide
- May cause fire or explosion; strong oxidiser.
- Causes severe skin burns and eye damage.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Do NOT induce vomiting.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Sodium peroxide in the GHS label constructor →
07 · Health hazards
Sodium peroxide health hazards and exposure limits
Sodium peroxide hazard summary
Hazardous decomposition products include oxygen (increased fire hazard) and toxic oxides of sodium; Corrosive to skin, eyes, and upper respiratory tract; [CHEMINFO MSDS] Corrosive; Inhalation of high concentration can cause chemical pneumonitis; [MSDSonline]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Sodium peroxide properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Sodium peroxide boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 657 °C (1214.6 °F) | HSDB |
Sodium peroxide melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 460 °C (860 °F) | HSDB | |
| 675 °C (1247 °F) | DOE PAC |
Sodium peroxide density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 2.8 g/cm³ | ICSC | |
| 2.805 g/cm³ | at 20 °C | HSDB | |
| 2.805 g/cm³ | at 25 °C | DOE PAC |
Sodium peroxide solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | SOLUBLE IN ACID; INSOLUBLE IN ALKALI | HSDB | |
| Freely sol in water, forming sodium hydroxide and hydrogen peroxide, the latter quickly decomp into oxygen and water | HSDB | ||
| Solubility in water: reaction | ICSC |
Sodium peroxide lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Dangerous fire and explosion risk in contact with alcohols, acids. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Sodium peroxide fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Sodium peroxide fire potential
MIXTURES OF SODIUM PEROXIDE & COMBUSTIBLE, ORGANIC OR READILY OXIDIZABLE SUBSTANCES...IGNITE EASILY BY FRICTION OR ON CONTACT WITH A SMALL AMT OF WATER.
Source: Hazardous Substances Data Bank (HSDB)
Fire and explosion
REACTS VIGOROUSLY WITH WATER & IN LARGE QUANTITIES MAY REACT EXPLOSIVELY. ... MIXTURES OF SODIUM PEROXIDE AND COMBUSTIBLE, ORGANIC OR READILY OXIDIZABLE SUBSTANCES ARE EXPLOSIVE.
Source: HSDB
SEVERAL BOXES OF THE PEROXIDE...EXPLODED WITH GREAT VIOLENCE DURING HANDLING OPERATIONS. IT SEEMS LIKELY THAT CONTAMINATION WITH COMBUSTIBLE MATERIAL HAD OCCURRED. /MIXTURES OF SODIUM PEROXIDE WITH EACH OF THE FOLLOWING ARE EXPLOSIVE: ALUMINUM CHLORIDE, AMMONIUM PEROXODISULFATE, CALCIUM ACETYLIDE, HYDROXY COMPOUNDS, METALS, METALS WITH CARBON DIOXIDE, PHOSPHORUS TRICHLORIDE, CARBON, PHOSPHORUS, AND WATER./
Source: HSDB
10 · Handling and storage
Sodium peroxide storage and handling
Sodium peroxide safe storage
Store in an area without drain or sewer access. Separated from combustible substances, reducing agents, acids and powdered metals. Dry.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Sodium peroxide storage conditions
KEEP TIGHTLY CLOSED & PROTECTED FROM CONTACT WITH ORGANIC OR OXIDIZABLE SUBSTANCES.
Source: Hazardous Substances Data Bank (HSDB)
Sodium peroxide incompatible materials
REACTS VIOLENTLY WITH WATER, ORG MATTER, CHARCOAL, GLYCEROL, DIETHYL ETHER, OR PHOSPHORUS.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Sodium peroxide in the storage compatibility matrix →
11 · Transport
Sodium peroxide UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
Sodium peroxide under UN 1504 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| SODIUM PEROXIDE | 5.1 | O2 | I | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 5.1 is “Oxidizing substances” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Sodium peroxide | 5.1 | I | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 5.1 is “Oxidizer” (49 CFR 173.2).
12 · Questions
Sodium peroxide — frequently asked questions
What is the CAS number of Sodium peroxide?
The CAS number of Sodium peroxide is 1313-60-6. Its EC number is 215-209-4.
What is the chemical formula of Sodium peroxide?
The molecular formula of Sodium peroxide is Na2O2 and its molecular weight is 77.978 g/mol.
What does a Sodium peroxide label have to show?
Under CLP Annex VI the label for Sodium peroxide carries the pictograms Flame over circle and Corrosion and the signal word is Danger.
Is Sodium peroxide flammable?
CLP Annex VI assigns Sodium peroxide no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Sodium peroxide a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Sodium peroxide. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Sodium peroxide?
The boiling point reported for Sodium peroxide is 657 °C (1214.6 °F) (HSDB).
What is the melting point of Sodium peroxide?
The melting point reported for Sodium peroxide is 460 °C (860 °F) (HSDB).
How should Sodium peroxide be stored?
KEEP TIGHTLY CLOSED & PROTECTED FROM CONTACT WITH ORGANIC OR OXIDIZABLE SUBSTANCES. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Sodium peroxide
Keep going: substances starting with S, or search the whole database by name, CAS number, pictogram or signal word.