Substance profile
Sodium Chlorate
Sodium Chlorate is colorless cubic crystals.
01 · Identification
What Sodium Chlorate is
Sodium Chlorate is colorless cubic crystals. It melts at 248 °C.
Under the GHS it carries the signal word Danger.
02 · Identifiers
Sodium Chlorate identifiers and molecular data
Sodium Chlorate CAS number and EC number
03 · GHS classification
Sodium Chlorate hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Sodium Chlorate pictograms and signal word
Sodium Chlorate hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Oxidising liquids or Oxidising solids | Category 1 | H271 | GHS03 |
| Acute toxicity - oral GHS chapter 3.1 | Category 3 | H301 | GHS06 |
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 Chlorate hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H271 | May cause fire or explosion; strong oxidiser. |
| H301 | Toxic if swallowed. |
This page lists only the codes assigned to Sodium Chlorate. 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 Chlorate
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 Chlorate 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 Chlorate precautionary statements
CLP Annex VI assigns 4 precautionary statements to Sodium Chlorate. 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 Chlorate 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 хлорат |
| Spanish español | Clorato de sodio |
| Czech čeština | chlorečnan sodný |
| Danish dansk | natriumchlorat |
| German Deutsch | Natriumchlorat |
| Estonian eesti | naatriumkloraat |
| Greek ελληνικά | χλωρικό νάτριο |
| English English | sodium chlorate |
| French français | chlorate de sodium |
| Croatian hrvatski | natrijev klorat |
| Italian italiano | clorato di sodio |
| Latvian latviešu | nātrija hlorāts |
| Lithuanian lietuvių | natrio chloratas |
| Hungarian magyar | nátrium-klorát |
| Maltese Malti | klorat tas-sodju |
| Dutch Nederlands | natriumchloraat |
| Polish polski | chloran(V) sodu |
| Portuguese português | clorato de sódio |
| Romanian română | clorat de sodiu |
| Slovak slovenčina | chlorečnan sodný |
| Slovenian slovenščina | natrijev klorat |
| Finnish suomi | natriumkloraatti |
| Swedish svenska | natriumklorat |
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 Chlorate GHS label elements
Everything CLP Annex VI fixes for Sodium Chlorate, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Sodium Chlorate
- May cause fire or explosion; strong oxidiser.
- Toxic if swallowed.
- Do not eat, drink or smoke when using this product.
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Rinse mouth.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Sodium Chlorate in the GHS label constructor →
07 · Health hazards
Sodium Chlorate health hazards and exposure limits
Sodium Chlorate hazard summary
A strong oxidant and fire hazard on contact with organic substances; [Hawley] A fire and explosion hazard on contact with combustible and reducing materials; A skin, eye, and respiratory tract irritant; Can induce methemoglobinemia; May cause kidney injury; [ICSC] A skin, eye, and upper respiratory tract irritant; Ingestion of toxic doses can cause hemolysis, methemoglobinemia, cyanosis, acute renal failure, and liver injury; [HSDB] A strong oxidizing agent that reacts explosively with organic materials; An eye irritant; Ingestion can cause respiratory failure and injury to kidneys and liver; [CAMEO] Can cause combustion or explosion on contact with combustible or flammable substances; Ingestion may cause methemoglobinemia and kidney injury; [CHEMINFO] An eye and mild skin irritant; May cause skin sensitization; [eChemPortal: ERMA] An oxidizing agent; May cause explosion on contact with combustible material; An irritant; Can induce methemoglobinemia; [MSDSonline] See CHLORATES.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Sodium Chlorate carcinogenicity classification
Under the conditions of this 2-year drinking water study, there was some evidence of carcinogenic activity of sodium chlorate in male and female F344/N rats based on increased incidences of thyroid gland neoplasms. There was no evidence of carcinogenic activity of sodium chlorate in male B6C3F1 mice exposed to 500, 1,000, or 2,000 mg/L. There was equivocal evidence of carcinogenic activity of sodium chlorate in female B6C3F1 mice based on marginally increased incidences of pancreatic islet neoplasms.
Source: US National Toxicology Program · TR-517: Toxicology and Carcinogenesis Studies of Sodium Chlorate (CASRN 7775-09-9) in F344/N Rats and B6C3F1 Mice (Drinking Water Studies) (2005 )
An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.
08 · Physical and chemical properties
Sodium Chlorate 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 Chlorate melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 248 °C (478.4 °F) | HSDB | |
| 247.78 °C (478 °F) | CAMEO |
Sodium Chlorate density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 2.5 g/cm³ | HSDB | |
| 2.49 g/cm³ | at 15 °C | CAMEO |
Sodium Chlorate solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Sodium chloride diminishes solubility in water | HSDB | |
| Solubility in water, g/l at 20 °C: 1000 (freely soluble) | at 20 °C | ICSC | |
| 100 g/100 g water at 25 °C; slightly soluble in ethanol | at 25 °C | HSDB |
Sodium Chlorate vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | Negligible at room temperature | HSDB |
Sodium Chlorate corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | CORROSIVE TO ZINC & MILD STEEL | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Sodium Chlorate 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 Chlorate fire potential
STRONG OXIDIZER-MIXING WITH OTHER MATERIALS CAN PRODUCE FLAMMABLE ... MIXTURES. ... CLOTHING CONTAMINATED ... SHOULD NOT BE BURNED WITH ORDINARY PLANT WASTES IN INCINERATOR OR UNDER STEAM BOILERS. SODIUM CHLORATE MUST BE USED WITH WATER SOLUBLE FIRE RETARDANT SUCH AS SODIUM METABORATE, SODA ASH, MAGNESIUM CHLORIDE, OR UREA.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Sodium Chlorate storage and handling
Sodium Chlorate safe storage
Store only in original container. Store in an area without drain or sewer access. Separated from combustible substances, reducing agents and incompatible materials. Dry. Well closed. See Chemical Dangers.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Sodium Chlorate storage conditions
Store in cool, dry, fire resistant area, separate from ... solvents, oils, organic substances ,,, sulfides, powdered metals... . Do n ot contaminate food or feedstuffs by storage.
Source: Hazardous Substances Data Bank (HSDB)
Sodium Chlorate incompatible materials
A strong oxidizer. Reacts violently with combustibles, sulfuric acid, and reducing materials. Reacts with strong acids giving off carbon dioxide. Explosions may be caused by contact with ammonia salts, ammonium thiosulfate, antimony sulfide, arsenic, carbon, charcoal, organic matter, organic acids, thiocyanates, chemically active metals, oils, metal sulfides, nitrobenzene, powdered metals, sugar. Reacts with some organic contaminants forming shock-sensitive mixtures.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Sodium Chlorate in the storage compatibility matrix →
11 · Transport
Sodium Chlorate 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.
The same CAS number is shipped under more than one UN number. Which entry applies follows from the form and the concentration of the consignment — read the proper shipping name, not the CAS.
Sodium Chlorate under UN 1495 — 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 CHLORATE | 5.1 | O2 | II | |
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 chlorate | 5.1 | II | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 5.1 is “Oxidizer” (49 CFR 173.2).
Sodium Chlorate under UN 2428 — 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 CHLORATE, AQUEOUS SOLUTION | 5.1 | O1 | II | |
| SODIUM CHLORATE, AQUEOUS SOLUTION | 5.1 | O1 | III | |
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 chlorate, aqueous solution | 5.1 | II | |
| Sodium chlorate, aqueous solution | 5.1 | III | |
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 Chlorate — frequently asked questions
What is the CAS number of Sodium Chlorate?
The CAS number of Sodium Chlorate is 7775-09-9. Its EC number is 231-887-4.
What does a Sodium Chlorate label have to show?
Under CLP Annex VI the label for Sodium Chlorate carries the pictograms Flame over circle and Skull and crossbones and the signal word is Danger.
Is Sodium Chlorate flammable?
CLP Annex VI assigns Sodium Chlorate 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 Chlorate a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Sodium Chlorate. 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 melting point of Sodium Chlorate?
The melting point reported for Sodium Chlorate is 248 °C (478.4 °F) (HSDB).
How should Sodium Chlorate be stored?
Store in cool, dry, fire resistant area, separate from ... solvents, oils, organic substances ,,, sulfides, powdered metals... . Do n ot contaminate food or feedstuffs by storage. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Sodium Chlorate
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