Chromium dioxide

  • Chromium oxide
  • Chromium (IV) oxide
Formula
CrO2
Structure
Description
Brown-black powder.
Uses
Recording medium on high energy magnetic recording tape.

Registry Numbers and Inventories.
CAS
12018-01-8
EC (EINECS/ELINCS)
234-630-4
RTECS
GB6400000
RTECS class
Other
Merck
12,2290
Beilstein/Gmelin
18391 (G)
RCRA
D007
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CrO2
Formula mass
83.99
Melting point, °C
300
Density
4.83 g/cm3
Solubility in water
insoluble

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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.
Protection
Employees should be provided with and required to use impervious clothing, gloves, face shields (eight-inch min), and other appropriate protective clothing necessary to prevent repeated or prolonged skin contact with solids or liquids containing insol chromium salts. Employees should be provided with and required to use dust and splashproof safety goggles where solids or liquids containing insol chromium salts may contact the eyes. Chromium metal and insol chromium salts.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
Metastable in air.
Incompatibilities
Strong oxidizing agents.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Health.
Exposure limit(s)
IDHL: NIOSH considers all chromic acid and chromates (CrO3) compounds as
Exposure effects
Hepatic encephalopathy, cerebral edema, and coma may occur. Both trivalent and hexavalent chromium have been found to cross the placental barrier in hamsters and mice. Both were shown to enter the fetus during mid to late gestation. Developmental effects caused by both differed between hamster and mice. Fetal uptake of hexavalent chromium was much greater than that of the trivalent form. Effects on placental tissue could have also affected the fetus.
   Ingestion
Gastroenteritis and hemorrhage frequently occur immediately following oral ingestion.
   Inhalation
Pulmonary edema, pneumoconiosis, metal fume fever, and bronchial asthma may occur.
   Skin
Deep perforating ulcers and hypersensitivity dermatitis may be noted. Systemic toxicity has resulted from minimal dermal exposure.

First aid
 
   Ingestion
Dilution: 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.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Wash the exposed area with water or 10 to 20 percent ascorbic acid solution for 15 minutes. Consult a physician if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
USCG CHRIS Code
CCD