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| Chromium metal | CAS 7440-47-3 | ||
| Cr | RTECS GB4200000 | ||
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Synonyms & Trade Names Chrome, Chromium |
DOT ID & Guide |
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Exposure Limits |
NIOSH REL: TWA 0.5 mg/m3 See Appendix C | ||
| OSHA PEL*: TWA 1 mg/m3 See Appendix C [*Note: The PEL also applies to insoluble chromium salts.] | |||
| IDLH 250 mg/m3 (as Cr) See: 7440473 | Conversion | ||
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Physical Description Blue-white to steel-gray, lustrous, brittle, hard, odorless solid. |
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MW: 52.0 |
BP: 4788°F |
MLT: 3452°F |
Sol: Insoluble |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 7.14 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Solid in bulk form, but finely divided dust burns rapidly if heated in a flame. | |||
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Incompatibilities & Reactivities Strong oxidizers (such as hydrogen peroxide), alkalis |
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Measurement Methods NIOSH 7024; OSHA ID121, ID125G See: NMAM or OSHA Methods |
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Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash Breathing: Respiratory support Swallow: Medical attention immediately |
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Important additional information about respirator selection Respirator Recommendations NIOSH Up to 2.5 mg/m3: (APF = 5) Any dust and mist respirator* Up to 5 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators*/(APF = 10) Any supplied-air respirator* Up to 12.5 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter* Up to 25 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter*/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 250 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode Emergency or planned entry into unknown concentrations or IDLH conditions: (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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, skin; lung fibrosis (histologic) | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION See ICSC CARD: 0029 See MEDICAL TESTS: 0052 |