Chemical
Potassium chlorate
CAS 3811-04-9 · EC 223-289-7 · ClKO3
- Signal word
- Danger
- CAS
- 3811-04-9
- EC number
- 223-289-7
- UK/EU status
- 1 rule
See UK and EU rules
Handle chemistry safely
Wear gloves and eye protection, work with good ventilation, and read the supplier’s safety data sheet before use. Hazard information here is a summary, not a replacement for it. Dispose of all photographic chemistry correctly, in line with local laws and your local authority’s guidance. Never mix waste solutions, and check the supplier’s safety data sheet before disposing of anything.
Hazards
Official EU classification (CLP Annex VI).
Harmonised classes: Ox. Sol. 1 (H271); Acute Tox. 3 (Oral) (H301).
Signal word: Danger
Oxidising · Acute toxicity
| Code | Hazard statement |
|---|---|
| H271 | May cause fire or explosion; strong oxidiser. |
| H301 | Toxic if swallowed. |
UK and EU rules
- UK Poisons Act 1972: REGULATED explosives precursor above 40% w/w – EPP licence required for members of the public (GOV.UK list of chemicals, checked 10 October 2026)
Photographic uses
- platinum/palladium contrast agent (traditional method)