CHROMIUM(VI)
OXIDE

ICSC: 1194

Date of Peer Review: October 2004

Chromic trioxide
Chromic acid
Chromic
anhydride

CAS #

1333-82-0

CrO3

RTECS #

GB6650000

Molecular mass:
100.0

UN #

1463

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.

NO water. In
case of fire in the surroundings: use appropriate extinguishing media.

EXPLOSION

EXPOSURE

PREVENT
DISPERSION OF DUST! AVOID ALL CONTACT!

IN ALL
CASES CONSULT A DOCTOR!

Inhalation

Cough.
Laboured breathing. Shortness of breath. Sore throat. Wheezing. Burning
sensation. Symptoms may be delayed (see Notes).

Closed
system and ventilation.

Fresh air,
rest. Half-upright position. Artificial respiration may be needed. Refer
for medical attention.

Skin

Redness.
Skin burns. Pain.

Protective
gloves. Protective clothing.

Remove
contaminated clothes. Rinse skin with plenty of water or shower. Refer for
medical attention.

Eyes

Redness.
Pain. Severe deep burns.

Safety
goggles, 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
pain. Burning sensation. Shock or collapse.

Do not eat,
drink, or smoke during work. Wash hands before eating.

Rinse mouth.
Do NOT induce vomiting. Refer for medical attention.

SPILLAGE DISPOSAL

PACKAGING & LABELLING

Do NOT let
this chemical enter the environment. Vacuum spilled material. OR Sweep
spilled substance into sealable 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. Personal
protection: complete protective clothing including self-contained
breathing apparatus.

Do not
transport with food and feedstuffs.
EU Classification

Symbol: O, T+, N
R: 45-46-9-24/25-26-35-42/43-48/23-62-50/53
S:
53-45-60-61
Note:
[E]
UN Classification
UN Hazard Class: 5.1
UN Subsidiary
Risks: 8
UN Pack Group: II

EMERGENCY RESPONSE

SAFE
STORAGE

Transport
Emergency Card: TEC (R)-51S1463
NFPA Code: H3; F0; R1; OX

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

IPCS
International
Programme on
Chemical
Safety

Prepared in the context of
cooperation between the International Programme on Chemical Safety
and the Commission of the European Communities © IPCS, CEC 2004

SEE IMPORTANT INFORMATION ON BACK

CHROMIUM(VI)
OXIDE

ICSC: 1194

IMPORTANT DATA

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

CHEMICAL DANGERS:
The
substance decomposes above 250°C to chromic oxide and oxygen, which
increases fire hazard. The substance is a strong oxidant and reacts
violently with combustible and reducing materials causing fire and
explosion hazard. The solution in water is a strong acid, it reacts
violently with bases and is corrosive.

OCCUPATIONAL EXPOSURE
LIMITS:
TLV: (as chromium, water-soluble Cr (VI) compounds) 0.05
mg/m³ as TWA; A1; BEI issued; (ACGIH 2004).
MAK: Sh; Carcinogen
category: 2; (DFG 2004).

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 is corrosive to the eyes, the skin and the
respiratory tract. Corrosive on ingestion.

EFFECTS OF LONG-TERM
OR REPEATED EXPOSURE:
Repeated or prolonged contact may cause skin
sensitization. Repeated or prolonged inhalation exposure may cause asthma.
The substance may have effects on the respiratory tract, kidneys,
resulting in nasal septum perforation, kidney impairment. This substance
is carcinogenic to humans. May cause heritable genetic damage to human
germ cells. Animal tests show that this substance possibly causes toxicity
to human reproduction or development.

PHYSICAL PROPERTIES

Decomposes
below boiling point at 250°C
Melting point: 197°C
Density: 2.7
g/cm³
Solubility in water: good

ENVIRONMENTAL DATA

The substance is very toxic to aquatic organisms. It is
strongly advised that this substance does not enter the environment.

NOTES

Rinse contaminated clothes (fire hazard) with plenty of water.
The symptoms of asthma often do not become manifest until a few hours have
passed and they are aggravated by physical effort. Rest and medical
observation are therefore essential. Anyone who has shown symptoms of
asthma due to this substance should avoid all further contact. Do NOT take
working clothes home. Depending on the degree of exposure, periodic
medical examination is suggested.

ADDITIONAL INFORMATION

LEGAL NOTICE

Neither the CEC nor the IPCS nor any person acting on
behalf of the CEC or the IPCS is responsible for the use which might
be made of this information

© IPCS, CEC
2004

See Also:
Toxicological Abbreviations