Safety data sheet reference · CAS 7778-50-9

Potassium dichromate SDS

also: potassium dichromate MSDS · safety data sheet · K2Cr2O7 · CAS 7778-50-9 · EC 231-906-6

Danger · Category 2–3 Carc. 1 · Muta. 1 · Category 1–2 · +6 Aquatic Acute 1 · Aquatic Chronic 1

Flame Over Circle GHS03 Corrosion GHS05 Skull and Crossbones GHS06 Health Hazard GHS08 Environmental Hazard GHS09

Official PDF from supplier

Sigma-Aldrich ↗ Fisher Scientific ↗ Carl Roth ↗

This page is a reference, not the legal document.

CAS number

7778-50-9

EC number

231-906-6

CLP Annex VI index

024-002-00-6

Molecular formula

Cr2K2O7

Molar mass

294.18 g/mol

§ 02 · Hazards identification

Harmonised EU classification

CLP Annex VI · Index 024-002-00-6. A supplier SDS may add self-classified hazards — this is the legal minimum.

H272 May intensify fire; oxidiser. Oxidising liquid/solid — Category 2–3

H301 Toxic if swallowed. Acute toxicity, oral — Category 3 (Acute Tox. 3)

H312 Harmful in contact with skin. Acute toxicity, dermal — Category 4

H314 Causes severe skin burns and eye damage. Skin corrosion — Category 1 (Skin Corr. 1)

H317 May cause an allergic skin reaction. Skin sensitiser — Category 1 (Skin Sens. 1)

H330 Fatal if inhaled. Acute toxicity, inhalation — Category 1–2

H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled. Respiratory sensitiser — Category 1 (Resp. Sens. 1)

H340 May cause genetic defects. Germ cell mutagenicity — Category 1 (Muta. 1)

H350 May cause cancer. Carcinogenicity — Category 1 (Carc. 1)

H372 Causes damage to organs through prolonged or repeated exposure. STOT repeated exposure — Category 1 (STOT RE 1)

H400 Very toxic to aquatic life. Hazardous to aquatic environment, acute — Category 1 (Aquatic Acute 1)

H410 Very toxic to aquatic life with long lasting effects. Hazardous to aquatic environment, chronic — Category 1 (Aquatic Chronic 1)

Precautionary statements

P201 Obtain special instructions before use.

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

P270 Do not eat, drink or smoke when using this product.

P271 Use only outdoors or in a well-ventilated area.

P272 Contaminated work clothing should not be allowed out of the workplace.

P273 Avoid release to the environment.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P301 IF SWALLOWED: call a POISON CENTER or doctor if you feel unwell.

P302 IF ON SKIN: wash with plenty of water.

P304 IF INHALED: remove person to fresh air and keep comfortable for breathing.

P308 IF exposed or concerned: get medical advice/attention.

P310 Immediately call a POISON CENTER or doctor.

P312 Call a POISON CENTER or doctor if you feel unwell.

P313 Get medical advice/attention.

P314 Get medical advice/attention if you feel unwell.

P330 Rinse mouth.

P331 Do NOT induce vomiting.

P333 If skin irritation or rash occurs: get medical advice/attention.

P352 Wash with plenty of water.

P391 Collect spillage.

P501 Dispose of contents/container in accordance with local regulations.

§ 07 · Handling and storage

Computed storage verdict

Never store with 8 storage groups Oxidizers Acute toxics

Derived from CLP Annex VI classification and CAMEO reactive-group data — not copied from a PDF.

⚠ Strong Oxidizing Agent

⛔ Never store with

Cyanides & sulfides Flammable liquids Flammable solids Mineral acids Organic acids Organic peroxides & self-reactives Reactive metals Water-reactives

↔ Keep separate

Bases Compressed gases Oxidizing acids Oxidizers Acute toxics

Full interactive verdict — reactions, gas release on contact, ADR forms →

§ 09 · Physical and chemical properties

Measured properties

Melting point 397.8 °C

Relative density (water = 1) 2.676

Source: CAMEO Chemicals (NOAA, public domain); per-value source references stored in the database.

§ 10 · Stability and reactivity

Reactive group (CAMEO/NOAA): Oxidizing Agents, Strong, Salts, Basic. Our database documents 75 incompatible and 23 caution reaction-partner groups for potassium dichromate — including which combinations release gas on contact. See the per-partner breakdown with gas release →

Incompatible

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.

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 "potassium dichromate MSDS" and a "potassium dichromate SDS" refer to the same document — today it is issued as an SDS. Full breakdown of the differences →

Other oxidizers 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 potassium dichromate

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)
Physical properties: CAMEO Chemicals (NOAA, public domain) — per-value source references stored in the database
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 "potassium dichromate MSDS" is today issued as an SDS.

What GHS pictograms does potassium dichromate require?

Under the harmonised EU classification (CLP Annex VI), potassium dichromate carries GHS03 and GHS05 and GHS06 and GHS08 and GHS09 with the signal word "Danger". Hazard statements: H272, H350, H340, H360FD, H330, H301, H312, H372, H314, H334, H317, H400, H410. A supplier's SDS may add self-classified hazards on top of this harmonised minimum.

What should potassium dichromate never be stored with?

Based on its storage classes (Oxidizers, Acute toxics), potassium dichromate must not share storage with: Cyanides & sulfides; Flammable liquids; Flammable solids; Mineral acids; Organic acids; Organic peroxides & self-reactives; Reactive metals; Water-reactives. Verify against the supplier's SDS sections 7 and 10 before finalising storage.

Where can I download an official potassium dichromate 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.