Chromic acid and chromates |
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. |
CAS No. 1333-82-0 (CrO3) |
RTECS No. GB6650000 (CrO3) |
DOT ID & Guide 1755 154 (acid solution)
1463 141 (acid, solid) |
FormulaCrO3 (acid) |
Conversion |
IDLH Ca [15 mg/m3 {as Cr(VI)}]
See: 1333820 |
Exposure Limits NIOSH REL (as Cr): Ca TWA 0.001 mg/m3 See Appendix A See Appendix C
OSHA PEL (as CrO3): TWA 0.005 mg/m3 See Appendix C |
Measurement Methods
NIOSH 7600 , 7604 , 7605 , 7703 , 9101;
OSHA ID103 , ID215 , W4001
See: NMAM or OSHA Methods |
Physical Description CrO3: Dark-red, odorless flakes or powder. [Note: Often used in an aqueous solution (H2CrO4).] |
MW: 100.0 |
BP: 482°F (Decomposes) |
MLT: 387°F (Decomposes) |
Sol: 63% |
VP: Very low |
IP: NA |
Sp.Gr: 2.70 (CrO3) |
Fl.P: NA |
UEL: NA |
LEL: NA |
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| CrO3: Noncombustible Solid, but will accelerate the burning of combustible materials. |
Incompatibilities & Reactivities Combustible, organic, or other readily oxidizable materials (paper, wood, sulfur, aluminum, plastics, etc.); corrosive to metals |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
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] |
Target Organs Blood, respiratory system, liver, kidneys, eyes, skin |
Cancer Site[lung cancer] |
Personal Protection/Sanitation (See protection codes)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench |
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately |
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 |
| See also: INTRODUCTION See ICSC CARD: 1194 See MEDICAL TESTS: 0051 |
