CHROMIUM (VI) OXIDE

International Chemical Safety Cards

CHROMIUM (VI) OXIDE

ICSC: 1194

CHROMIUM (VI) OXIDE
Chromic trioxide
Chromic acid
Chromic anhydride
CrO₃
Molecular mass: 100.01
CAS # 1333-82-0
RTECS # GB6650000
ICSC # 1194
UN # 1463 (anhydrous)
EC # 024-001-00-0

TYPES OF HAZARD/ EXPOSURE	ACUTE HAZARDS/ SYMPTOMS	PREVENTION	FIRST AID/ FIRE FIGHTING
FIRE	Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion.	NO contact with combustible substances and reducing agents.	Powder, water spray, foam, carbon dioxide.
EXPLOSION			In case of fire: keep drums, etc., cool by spraying with water.

EXPOSURE		PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!	IN ALL CASES CONSULT A DOCTOR!
INHALATION	Cough. Laboured breathing. Shortness of breath. Sore throat. Wheezing.	Avoid inhalation of fine dust and mist. Ventilation (not if powder), local exhaust, or breathing protection.	Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention.
SKIN	Redness. Skin burns. Pain.	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse skin with plenty of water or shower.
EYES	Redness. Pain. Permanent loss of vision. Severe deep burns.	Safety spectacles, face shield, or eye protection in combination with breathing protection.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
INGESTION	Abdominal cramps.	Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Do NOT wash away into sewer. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Do NOT absorb in saw-dust or other combustible absorbents (extra personal protection: complete protective clothing including self-contained breathing apparatus).

Separated from combustible and reducing substances, food and feedstuffs, bases. Dry.

Do not transport with food and feedstuffs.
O symbol
T symbol
R: 49-8-25-35-43
S: 53-45
Note: E
UN Hazard Class: 5.1
UN Subsidiary Risks: 8
UN Packing Group: II

SEE IMPORTANT INFORMATION ON BACK

ICSC: 1194

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards

CHROMIUM (VI) OXIDE

ICSC: 1194

I

M

P

O

R

T

A

N

T

D

A

T

A

PHYSICAL STATE; APPEARANCE:
ODOURLESS, DARK RED DELIQUESCENT CRYSTALS, FLAKES, OR GRANULAR POWDER.

PHYSICAL DANGERS:

CHEMICAL DANGERS:
The substance decomposes above 250°C to chromic oxide and oxygen with increased fire hazard. The substance is a strong oxidant. Reacts violently with combustible substances and reducing agents causing fire and explosion hazard. In aqueous solution, is a strong acid which reacts with bases and is corrosive.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV (as Cr): ppm; 0.05 mg/m³ (ACGIH 1993-1994).

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation and through the skin, and by ingestion.

INHALATION RISK:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed, especially if powdered.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes, the skin and the respiratory tract.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis and chrome ulcers. Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation exposure may cause asthma-like reactions. See notes. The substance may have effects on the nasal septum , resulting in perforation. This substance is probably carcinogenic to humans.

PHYSICAL
PROPERTIES

Decomposes below boiling point at 250°C
Melting point: 197°C

Relative density (water = 1): 2.70
Solubility in water: good