CHROMIUM AND INORGANIC COMPOUNDS 

METALLIC CHROMIUM, Cr(O) 

CAS number: 7440-47-3  

Chemical structure: Cr  

TLV–TWA, 0.5 mg/m³, as Cr(O), Inhalable particulate matter 

TRIVALENT CHROMIUM COMPOUNDS, Cr(III) 

CAS number: Various (see Table 1) 

Chemical structures: Various (see Table 1)  

TLV–TWA, 0.003 mg/m³, as Cr(III), Inhalable particulate matter 

Respiratory Sensitization (RSEN) (water-soluble compounds only) and Dermal Sensitization (DSEN) (water-soluble compounds only) 

A4 — Not Classifiable as a Human Carcinogen 

HEXAVALENT CHROMIUM COMPOUNDS, Cr(VI)  

CAS number: Various (see Table 1) 

Chemical structures: Various (see Table 1)  

TLV–TWA, 0.0002 mg/m³, as Cr(VI), Inhalable particulate matter 

TLV–STEL, 0.0005 mg/m³, as Cr(VI), Inhalable particulate matter 

Respiratory Sensitization (RSEN) and Dermal Sensitization (DSEN)  

Skin (water-soluble compounds only) 

A1 — Confirmed Human Carcinogen 

CHROMYL CHLORIDE 

CAS number: 14977-61-8 

Chemical structure:  

TLV–TWA, 0.0001 ppm (0.0002 mg/m³), as Cr(VI), Inhalable fraction and vapor 

TLV–STEL, 0.00025 ppm (0.0005 mg/m³), as Cr(VI), Inhalable fraction and vapor 

Respiratory Sensitization (RSEN) and Dermal Sensitization (DSEN) 

Skin 

A1 — Confirmed Human Carcinogen 

CHROMITE ORE PROCESSING (see Hexavalent and Trivalent Chromium Compounds) 

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