Product Identification

Product Name

Chromium trioxide

Synonyms

Chromia
Chromic acid
Chromic anhydride
Chromic trioxide
Chromium oxide

Synonyms

Chromic (VI) acid
Chromium hydroxide oxide

CAS

1333-82-0

CAS

7738-94-5

Formula

CrH2O4

Formula

CrO3

Molecular Weight

99.99

Molecular Weight

118.02

EINECS

215-607-8

EINECS

231-801-5

RTECS

GB2450000

RTECS

GB6650000

RTECS Class

Mutagen

RTECS Class

Tumorigen; Mutagen; Reproductive Effector; Human Data

Merck

13,2256

Beilstein/Gmelin

15491 (G)

EC Index Number

024-001-00-0

EC Class

Oxidising; Carcinogenic Category 1; Toxic; Corrosive; Sensitising; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Chromic acid, solid is a dark purplish red solid.

Appearance

Dark red, bipyramidal prismatic crystals, flakes or granular powder, odorless, delinquescent.

Solubility in water

Very soluble

Melting Point

196

Density

2.70 g/cm3 (20 C)

Heat Of Vaporization

Usage

Medication (vet).

Usage

Chromium plating intermediate, medicine (caustic), process engraving, anodizing, ceramic glazes, colored glass, metal cleaning, inks, tanning, paints.

Vapor Density

3.4

Odor threshold

Odorless

First Aid Measures

Ingestion

Call a physician; do NOT induce vomiting.

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

Inhalation

Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.

Skin

Get medical aid. Wash clothing before reuse. Rinse area with large amounts of water for at least 15 minutes. Destroy contaminated shoes.

Skin

Immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Do not induce vomiting. Administer ascorbic acid (1 g per 0.135 G of elemental chromium). Neutralization is not indicated. Cautious gastric lavage with a small flexible tube is suggested by some authors.

Eyes

Get medical aid immediately. Extensive irrigation is required (at least 30 minutes).

Eyes

Wash eyes thoroughly for at least 15 min.; flush contacted skin areas with water; remove contaminated clothing and wash before reuse.

Handling and Storage

Storage

Do not store near combustible materials. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area.

Storage

Isolate. Protect from physical damage. Separate from combustible, organic or other readily oxidizable materials. Protect from moisture. Avoid storage on wooden floors.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with skin and eyes. Keep container tightly closed. Avoid contact with clothing and other combustible materials. Avoid ingestion and inhalation. Use with adequate ventilation. Discard contaminated shoes.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Inhalation

Inhalation of dust is toxic. Causes irritation and burns. Severe over exposure may result in death.

Inhalation

May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. May cause asthmatic attacks due to allergic sensitization of the respiratory tract.

Skin

May cause severe burns.

Skin

May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause irritation with burning pain, itching and redness. May cause deep, penetrating ulcers of the skin. May be absorbed through damaged or abraded skin in harmful amounts. Chronic exposure to water insoluble hexavalent chromium compounds has been shown to be associated with lung cancer and gastrointestinal tract tumors.

Eyes

May cause irreversible eye injury. Contact with eyes may cause severe irritation, and possible eye burns.

Eyes

See Skin.

Ingestion

Causes irritation and burns.

Ingestion

Harmful if swallowed. May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May cause liver and kidney damage.

Hazards

Containers may explode

Hazards

May explode from heat or contamination. Some may burn rapidly. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.

EC Risk Phrase

R 49 8 25 35 43 50/53

EC Safety Phrase

S 53 45 60 61

UN (DOT)

1463

Exposure Controls/Personal Protection

Personal Protection

Approved respirators, vaseline for lubrication of nostrils, rubberized outer wear and safety goggles are required. Rubber is poor and pva not recommended for gloves (cheea3 0001); white creams should not be relied upon. They can be used to cover unprotected area. Do not use organic clothes as part of outer wear, must be rubberized fabric.

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear a chemical apron. Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear a chemical apron. Wear appropriate protective gloves to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure Effects

Prolonged or repeated inhalation may cause nosebleeds, nasal congestion, erosion of the teeth, perforation of the nasal septum, chest pain and bronchitis. Prolonged or repeated eye contact may cause conjunctivitis. Prolonged or repeated skin contact may cause sensitization dermatitis and possible destruction and/or ulceration. Chronic ingestion may cause effects similar to those of acute ingestion. Chronic exposure to water insoluble hexavalent chromium compounds has been shown to be associated with lung cancer and gastrointestinal tract tumors.

Exposure Effects

The toxological properties of this substance have not been fully investigated.

Exposure limit(s)

TLV (as Cr) - 0.05 mg/m3 (ACGIH 1993-1994)

Exposure limit(s)

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

Poison Class

1*

Fire Fighting Measures

Fire Fighting

Flood with water. Apply water from as far a distance as possible.

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Strong oxidizer. Contact with combustible materials may cause a fire. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Wear appropriate protective clothing to prevent contact with skin and eyes. Wear a self-contained breathing apparatus (SCBA) to prevent contact with thermal decomposition products. Containers may explode in the heat of a fire. Extinguishing media: Use water only! Use extinguishing media most appropriate for the surrounding fire. Cool containers with flooding quantities of water until well after fire is out. DO NOT use dry chemicals, carbon dioxide, Halon or foams.

Fire Potential

Will ignite on contact with acetic acid and alcohol. Hazard may be quite evident; can ignite organic matter on contact.

Fire Potential

These substances will accelerate burning when involved in a fire.

Accidental Release Measures

Small spills/leaks

Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Neutralize spilled material with crushed limestone, soda ash, or lime. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.

Small spills/leaks

Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation. Do not use combustible materials such as paper towels to clean up spill.

Stability and Reactivity

Incompatibilities

Acetic Acid, acetic anhydride, acetone, alcohols, alkali metals, ammonia, arsenic, anthracene, benzene, bromine pentafluorine, butyric acid, camphor, chlorine trifluoride, chromous sulfide, diethyl ether, dimethyl formamide, glycerol, hydrogen sulfide, methyl alcohol, naphthalene,peroxyformic acid, phosphorus, potassium hexacyanoferrate, pyridine, selenium, sodium, sulfur, turpentine, ethyl alcohol and many hydrocarbons.

Incompatibilities

Keep away from acetic acid, acetic anhydride, acetone, alcohols, alkali metals.

Stability

Normally stable. Reactive under extreme conditions. Containers may explode when involved in fire. Violent reaction with powerful reducers.

Stability

Stable under normal temperatures and pressures.

Decomposition

Irritating and toxic fumes and gases, chromium dioxide.

Decomposition

Irritating and toxic fumes.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

1463

Hazard Class

5.1

Packing Group

II

HS Code

2819 10 00