Identification
| CAS number | 7722-84-1 |
|---|---|
| EC number | 231-765-0 |
| Physical form | liquid |
| Signal word | DANGER |
| Pictograms | GHS03 Oxidising; GHS05 Corrosive; GHS07 Harmful or irritant |
| Routes of exposure | skin, eyes, inhalation, ingestion |
Hazard classification
Harmonised classification from the GB mandatory classification list (index 008-003-00-9). The classification shown is for solutions of 70% and above. 50 to 70%: oxidising liquid category 2 and Skin Corr 1B. 35 to 50%: skin irritant, serious eye damage and respiratory irritant. 8 to 35%: serious eye damage only. 5 to 8%: eye irritant only. Hair developer at 3 to 12% therefore carries H318 or H319, not H314.
- Oxidising liquid, category 1
- Acute toxicity, category 4
- Skin corrosion, category 1A
Hazard statements
- H271 May cause fire or explosion; strong oxidiser.
- H302 Harmful if swallowed.
- H332 Harmful if inhaled.
- H314 Causes severe skin burns and eye damage.
Workplace exposure limit
| Reference period | ppm | mg/m³ |
|---|---|---|
| Long term (8 hour TWA) | 1 | 1.4 |
| Short term (15 minute) | 2 | 2.8 |
Products that contain it
Common products whose hazard data comes from this record. The concentration and form vary, so always check the product data sheet.
- Wella Welloxon Perfect developer (Wella). Cream peroxide at 1.9% to 12% (6 to 40 vol). Higher strengths damage eyes; wear gloves and eye protection when mixing.
- Schwarzkopf Igora Royal Oil Developer (Schwarzkopf). Cream peroxide, 3% to 12%.
- L'Oréal Oxydant Crème (L'Oréal Professionnel). Cream peroxide, 3% to 12%.
- Hydrogen peroxide 3% solution (Various). Dilute solution. Much lower hazard than the concentrate the substance record describes; check the label.
Common uses
- Hair colour developer
- Disinfection
- Bleaching
First aid
Skin and eyes: rinse with plenty of water. Eyes: get medical attention. Swallowed: rinse mouth and call NHS 111.
In an emergency call 999. For advice call NHS 111. Always follow section 4 of the safety data sheet for the product you have.
Storage
Cool, ventilated, original vented container, away from combustible materials and metals.
Sources
- HSE GB mandatory classification and labelling list (GB MCL), Index 008-003-00-9. Checked 8 September 2026.
- ECHA C&L Inventory, CAS 7722-84-1, ECHA 100.028.878. Checked 8 September 2026.
- HSE EH40/2005 Workplace exposure limits (2020 edition), Table 1. Checked 8 September 2026.
We do not host or copy manufacturer safety data sheets. Ask your supplier for the current sheet for the product you use.