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3. Hazards
A sealed Nickel-Metal Hydride cell is not hazardous on principle.
3.1 Physical
No risk if cells are used for its intended purpose and according to valid directions for use.
3.2 Chemical
In normal use, no chemical risk.
On some bad using conditions (high over charge, external short circuit…) and in case of a bad
functioning, some electrolyte can be removed from the cell by the security vent.
In these cases the risk is the caustic nature of electrolyte.
The toxic properties of the electrode materials are hazardous only if the materials are
released by damaging the cell or if exposed to fire.
Classification of dangerous substances contained into the cells.
SUBSTANCKES CLASSIFICATION
Name
EEC Number CAS
Number
Symbol Letter Identification
of danger
Special
risk(1)
Safety
advice(2)
Nickel
Hydroxide
028-008-x*
12054-48-7
Ni(OH)2 Xn Harmful R
20/22-43-
40
S 22/36
Cobalt
Hydroxide
21041-93-0 Co(OH)2 Xn Harmful R22-42/43 S22-24-37
Potassium
Hydroxide
019-002-00-81310-
58-3
KOH C Corrosive R 35 S 26-3 7/3 9 -45
(1) Nature of special risk
R 20/21/22: Harmful by inhalation, skin contact or if swallowed.
R 20/22: Harmful by inhalation or if swallowed.
R 35: Causes serious burns.
R 40: Possible risk of irreversible effects.
R 43: Many cause sensitizing by skin contact.
R 42/43: Many cause sensitizing by inhalation and skin contact.
(2) Safety advice
S 22: Do not breathe dust.
S 24: Avoid contact with skin.
S 26: In case of contact with eyes, rinse immediately with plenty of water and seek medical