Chromic trioxide
Chromic acid
Chromic anhydride
CrO3
Molecular mass: 100.0
ICSC # 1194
CAS # 1333-82-0
RTECS # GB6650000
UN # 1463
EC # 024-001-00-0
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible but enhances combustion of other substances.
Many reactions may cause fire or explosion.
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NO contact with combustible substances and reducing agents.
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NO water.
In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
AVOID ALL CONTACT!
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IN ALL CASES CONSULT A DOCTOR!
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•Inhalation
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Cough.
Laboured breathing.
Shortness of breath.
Sore throat.
Wheezing.
Burning sensation.
Symptoms may be delayed (see Notes).
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Closed system and ventilation.
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Fresh air, rest.
Half-upright position.
Artificial respiration may be needed.
Refer for medical attention.
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•Skin
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Redness.
Skin burns.
Pain.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
Refer for medical attention.
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•Eyes
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Redness.
Pain.
Severe deep burns.
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Safety goggles,
or eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Burning sensation.
Shock or collapse.
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Rinse mouth.
Do NOT induce vomiting.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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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.
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Separated from
combustible and reducing substances,
bases
,
food and feedstuffs
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Dry.
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Do not transport with food and feedstuffs.
Note: E
O symbol
T+ symbol
N symbol
R: 45-46-9-24/25-26-35-42/43-48/23-62-50/53
S: 53-45-60-61
UN Hazard Class: 5.1
UN Subsidiary Risks: 8
UN Packing Group: II
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Important Data
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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
, 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).
OSHA PEL (as CrO3): C 0.1 mg/m3 See Appendix C
NIOSH REL (as Cr): Ca TWA 0.001 mg/m3 See Appendix A See Appendix C
NIOSH IDLH: Ca 15 mg/m3 {as Cr(VI)} See: 1333820
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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.
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Physical
Properties
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Decomposes below boiling point at 250°C
Melting point: 197°C
Density: 2.7
g/cm3
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Solubility in water:
good
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Environmental
Data
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The substance is very toxic to aquatic organisms.
It is strongly advised that this substance does not enter the environment.
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N O T E S
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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.
Transport Emergency Card: TEC (R)-51S1463
NFPA Code: H3; F0; R1; OX
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ADDITIONAL INFORMATION
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ICSC: 1194
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CHROMIUM(VI) OXIDE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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