Substance profile
Sodium Dichromate
Sodium Dichromate is light-brown to orange-red plates which are strongly hygroscopic and is odorless.
01 · Identification
What Sodium Dichromate is
Sodium Dichromate is light-brown to orange-red plates which are strongly hygroscopic and is odorless. It boils at 400 °C, melts at 357 °C.
Under the GHS it carries the signal word Danger. It is classed as carcinogens.
02 · Identifiers
Sodium Dichromate identifiers and molecular data
Sodium Dichromate CAS number and EC number
Sodium Dichromate molecular formula and molecular weight
03 · GHS classification
Sodium Dichromate hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Sodium Dichromate pictograms and signal word
Sodium Dichromate hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Oxidising liquids or Oxidising solids | Category 2 or 3 | H272 | GHS03 |
| Acute toxicity - oral GHS chapter 3.1 | Category 3 | H301 | GHS06 |
| Acute toxicity - dermal GHS chapter 3.1 | Category 4 | H312 | GHS07 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 1 or 2 | H330 | GHS06 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| Respiratory sensitisation GHS chapter 3.4 | Category 1 or 1A or 1B | H334 | GHS08 |
| Skin sensitisation GHS chapter 3.4 | Category 1 or 1A or 1B | H317 | GHS07 |
| Germ cell mutagenicity GHS chapter 3.5 | Category 1A or 1B | H340 | GHS08 |
| Carcinogenicity GHS chapter 3.6 | Category 1A or 1B | H350 | GHS08 |
| Specific target organ toxicity - repeated exposure GHS chapter 3.9 | Category 1 | H372 | GHS08 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
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 Dichromate hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H272 | May intensify fire; oxidiser. |
| H350 | May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H340 | May cause genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H360FD | May damage fertility. May damage the unborn child. |
| H330 | Fatal if inhaled. |
| H301 | Toxic if swallowed. |
| H312 | Harmful in contact with skin. |
| H372 | Causes damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H314 | Causes severe skin burns and eye damage. |
| H334 | May cause allergy or asthma symptoms or breathing difficulties if inhaled. |
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Sodium Dichromate. 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 Dichromate
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 Dichromate 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 Dichromate precautionary statements
CLP Annex VI assigns 22 precautionary statements to Sodium Dichromate. 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.
Disposal
What has to happen to the contents and the empty container.
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 Dichromate 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 дихромат |
| Spanish español | Dicromato de sodio |
| Czech čeština | dichroman sodný |
| Danish dansk | natriumdichromat |
| German Deutsch | Natriumdichromat |
| Estonian eesti | naatriumdikromaat |
| Greek ελληνικά | διχρωμικό νάτριο |
| English English | sodium dichromate |
| French français | dichromate de sodium |
| Croatian hrvatski | natrijev dikromat |
| Italian italiano | dicromato di sodio |
| Latvian latviešu | nātrija dihromāts |
| Lithuanian lietuvių | natrio dichromatas |
| Hungarian magyar | nátrium-dikromát |
| Maltese Malti | dikromat tas-sodju |
| Dutch Nederlands | natriumdichromaat |
| Polish polski | dichromian(VI) sodu |
| Portuguese português | dicromato de sódio |
| Romanian română | dicromat de sodiu |
| Slovak slovenčina | dichróman sodný |
| Slovenian slovenščina | natrijev dikromat |
| Finnish suomi | natriumdikromaatti |
| Swedish svenska | natriumdikromat |
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 Dichromate GHS label elements
Everything CLP Annex VI fixes for Sodium Dichromate, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Sodium Dichromate
- May intensify fire; oxidiser.
- May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- May cause genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- May damage fertility. May damage the unborn child.
- Fatal if inhaled.
- Toxic if swallowed.
- Harmful in contact with skin.
- Causes damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- Causes severe skin burns and eye damage.
- May cause allergy or asthma symptoms or breathing difficulties if inhaled.
- May cause an allergic skin reaction.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Obtain special instructions before use.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Avoid breathing dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Use only outdoors or in a well-ventilated area.
- Contaminated work clothing should not be allowed out of the workplace.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF ON SKIN:
- IF INHALED:
- IF exposed or concerned:
- Immediately call a POISON CENTER/doctor/…
- Call a POISON CENTER/doctor/… if you feel unwell.
- Get medical advice/attention.
- Get medical advice/attention if you feel unwell.
- Rinse mouth.
- Do NOT induce vomiting.
- If skin irritation or rash occurs:
- Wash with plenty of water/…
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Sodium Dichromate in the GHS label constructor →
07 · Health hazards
Sodium Dichromate health hazards and exposure limits
Sodium Dichromate hazard summary
A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; Can be absorbed through skin; May cause skin sensitization and asthma after prolonged contact; May cause kidney and liver injury; May cause perforated nasal septum; [ICSC] A skin and eye irritant; Can cause asthma-like respiratory irritation; A powerful oxidizing agent; [HSDB] Corrosive to skin and eyes; May cause skin and respiratory sensitization after prolonged contact; [CHEMINFO] See Chromium and linked occupational diseases.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Sodium Dichromate carcinogenicity classification
Cancer Classification: Group A Human Carcinogen by Inhalation; Group D Not Classifiable as to Human Carcinogenicity by Oral Route
Source: Hazardous Substances Data Bank (HSDB)
Evaluation: There is sufficient evidence in humans for the carcinogenicity of chromium(VI) compounds. Chromium(VI) compounds cause cancer of the lung. Also positive associations have been observed between exposure to Chromium(IV) compounds and cancer of the nose and nasal sinuses. There is sufficient evidence in experimental animals for the carcinogenicity of chromium(VI) compounds. Chromium(VI) compounds are carcinogenic to humans (Group 1). /Chromium(VI) compounds/
Source: Hazardous Substances Data Bank (HSDB)
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.
Sodium Dichromate occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | 0.005 [mg/m3], as Cr(VI) | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| IDLH | 15 mg Cr(VI)/m3 ; A potential occupational carcinogen. (NIOSH, 2024) | CAMEO Chemicals |
| IDLH | 250 mg/cu m (as Cr(II)). /Chromium(II) compounds (as Cr)/ | Hazardous Substances Data Bank (HSDB) |
| IDLH | 25 mg/cu m (as Cr(III)). /Chromium(III) compounds (as Cr)/ | Hazardous Substances Data Bank (HSDB) |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · Physical and chemical properties
Sodium Dichromate 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 Dichromate boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 400 °C (752 °F) | decomposes, decomposes | HSDB |
Sodium Dichromate melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 356.7 °C (674.1 °F) | HSDB | |
| 357.22 °C (675 °F) | CAMEO | ||
| 357 °C (674.6 °F) | ICSC |
Sodium Dichromate density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1 g/cm³ | HSDB | |
| 2.35 g/cm³ | Sodium chromate dihydrate | HSDB | |
| 2.35 g/cm³ | at 25 °C | CAMEO |
Sodium Dichromate solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Solubility in water, g/100ml at 20 °C: 236 (very good) | at 20 °C | ICSC |
| 513.2 g/L methanol at 19.4 °C | at 19.4 °C | HSDB | |
| In water, 187 g/100 g water at 25 °C | at 25 °C | HSDB |
Sodium Dichromate autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | Not flammable (USCG, 1999) | CAMEO |
Sodium Dichromate corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Corrosive because of oxidizing potency. | Chromate salts | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Sodium Dichromate 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 Dichromate fire potential
Violent reaction or ignition with boron + silicon (pyrotechnic); organic residues + sulfuric acid; 2-propanol + sulfuric acid; sulfuric acid + trinitrotoluene.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Sodium Dichromate storage and handling
Sodium Dichromate safe storage
Dry. Provision to contain effluent from fire extinguishing. Separated from combustible substances, reducing agents and food and feedstuffs. Well closed. Store in an area without drain or sewer access.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Sodium Dichromate storage conditions
Keep container tightly closed in a dry and well-ventilated place. Storage class (TRGS 510): Oxidizing hazardous materials /Sodium Dichromate Dihydrate/
Source: Hazardous Substances Data Bank (HSDB)
Sodium Dichromate incompatible materials
Incompatible materials: Strong reducing agents, alcohols. /Sodium Dichromate Dihydrate/
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Sodium Dichromate in the storage compatibility matrix →
11 · Questions
Sodium Dichromate — frequently asked questions
What is the CAS number of Sodium Dichromate?
The CAS number of Sodium Dichromate is 10588-01-9. Its EC number is 234-190-3.
What does a Sodium Dichromate label have to show?
Under CLP Annex VI the label for Sodium Dichromate carries the pictograms Flame over circle, Skull and crossbones, Corrosion, Health hazard and Environment and the signal word is Danger.
Is Sodium Dichromate flammable?
CLP Annex VI assigns Sodium Dichromate 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 Dichromate a carcinogen?
Yes. CLP Annex VI classifies Sodium Dichromate as a category 1A or 1B carcinogen and assigns it H350: may cause cancer.
What is the exposure limit for Sodium Dichromate?
The US occupational exposure limit reported for Sodium Dichromate is 0.005 [mg/m3], as Cr(VI) (Haz-Map, Information on Hazardous Chemicals and Occupational Diseases). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
What is the boiling point of Sodium Dichromate?
The boiling point reported for Sodium Dichromate is 400 °C (752 °F), decomposes, decomposes (HSDB).
What is the melting point of Sodium Dichromate?
The melting point reported for Sodium Dichromate is 356.7 °C (674.1 °F) (HSDB).
How should Sodium Dichromate be stored?
Keep container tightly closed in a dry and well-ventilated place. Storage class (TRGS 510): Oxidizing hazardous materials /Sodium Dichromate Dihydrate/ (Hazardous Substances Data Bank (HSDB))
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