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 |
What the two limits and the notations mean: workplace exposure limits and EH40 explained.
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.