Chromic acid and chromates
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CAS
1333-82-0 (CrO3)
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CrO3 (acid)
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RTECS
GB6650000 (CrO3)
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Synonyms & Trade Names
Chromic acid (CrO3): Chromic anhydride, Chromic oxide, Chromium(VI) oxide (1:3), Chromium trioxide
Synonyms of chromates (i.e., chromium(VI) compounds) such as zinc chromate vary depending upon the specific compound.
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DOT ID & Guide
1755 / 154 (acid solution)
1463 / 141 (acid, solid)
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Exposure
Limits
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NIOSH REL (as Cr): Ca TWA 0.001 mg/m3 See Appendix A See Appendix C
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OSHA PEL (as CrO3): C 0.1 mg/m3 See Appendix C
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IDLH
Ca [15 mg/m3 {as Cr(VI)}]
See: 1333820
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Conversion
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Physical Description
CrO3: Dark-red, odorless flakes or powder. [Note: Often used in an aqueous solution (H2CrO4).]
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MW: 100.0
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BP: 482°F (Decomposes)
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MLT: 387°F (Decomposes)
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Sol: 63%
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VP: Very low
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IP: NA
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Sp.Gr: 2.70 (CrO3)
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Fl.P: NA
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UEL: NA
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LEL: NA
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CrO3: Noncombustible Solid, but will accelerate the burning of combustible materials.
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Incompatibilities & Reactivities
Combustible, organic, or other readily oxidizable materials (paper, wood, sulfur, aluminum, plastics, etc.); corrosive to metals
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Measurement Methods
NIOSH 7600, 7604, 7605, 7703, 9101; OSHA ID103, ID215, W4001
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation respiratory system; nasal septum perforation; liver, kidney damage; leukocytosis (increased blood leukocytes), leukopenia (reduced blood leukocytes), eosinophilia; eye injury, conjunctivitis; skin ulcer, sensitization dermatitis; [potential occupational carcinogen]
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Target Organs
Blood, respiratory system, liver, kidneys, eyes, skin
Cancer Site
[lung cancer]
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See also: INTRODUCTION See ICSC CARD: 1194 See MEDICAL TESTS: 0051
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