Product Identification

Product Name

Chromium carbide

Synonyms

Trichromium dicarbide

CAS

12012-35-0

Formula

C2Cr3

Molecular Weight

180.01

EINECS

234-576-1

Physical and Chemical Properties

Appearance

Odorless gray powder.

Solubility in water

Reacts

Melting Point

1890

Boiling Point

3800

Density

6.68 g/cm3 (20 C)

Usage

Used as a thermal spray material for protecting the underlying metal surface, and as an additive to corrosion-resistant and wear-resistant materials. It is used in coatings of bearings, seals, orifices, and valve seals, and as a fine-crystal phase in other sintered carbides.

First Aid Measures

Ingestion

Seek medical treatment.

Inhalation

Supply fresh air. If required, provide artificial respiration. Keep patient warm. Seek immediate medical advice.

Skin

Immediately wash with water and soap and rinse thoroughly. Seek immediate medical advice.

Eyes

Rinse opened eye for several minutes under running water. Then consult a doctor.

Handling and Storage

Storage

Store under dry inert gas. Protect from humidity and water. Keep container tightly sealed. Store in cool, dry conditions in well sealed containers.

Exposure Controls/Personal Protection

Personal Protection

Protective work clothing. Chemical protective gloves. Safety glasses or goggles.

Exposure Effects

Causes irritation of eyes, skin and mucous membranes. Chromium powder, chromium (II) and chromium (III) compounds may cause nausea, diarrhea, vomiting, skin and eye irritation and pneumoconiosis. Although less likely than Cr(VI) compounds, the NTP considers all chromium to be potentially carcinogenic.

Exposure limit(s)

NIOSH PEL: 0.5 mg/m3 (as Cr)

Fire Fighting Measures

Fire Fighting

Extinguish with CO2, sand, extinguishing powder. Do not use water. Wear self-contained respirator. Wear fully protective impervious suit.

Fire Potential

Contact with water releases flammable gases.

Accidental Release Measures

Small spills/leaks

Ensure adequate ventilation. Keep away from ignition sources.

Stability and Reactivity

Incompatibilities

Acids, bases, water/moisture.

Stability

Decomposition will not occur if used and stored according to specifications.

Decomposition

Toxic metal oxide fumes, methane.

Combustion Products

Toxic metal oxide fumes.

Transport Information

UN Number

3178

Hazard Class

4.1

Packing Group

III

Hazards Identification

EC Risk Phrase

R: 11

UN (DOT)

3178