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| Hafnium | CAS 7440-58-6 | ||
| Hf | RTECS MG4600000 | ||
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Synonyms & Trade Names Celtium, Elemental hafnium, Hafnium metal |
DOT ID & Guide 1326 170 (powder, wet) 2545 135 (powder, dry) |
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Exposure Limits |
NIOSH REL*: TWA 0.5 mg/m3 [*Note: The REL also applies to other hafnium compounds (as Hf).] | ||
| OSHA PEL*: TWA 0.5 mg/m3 [*Note: The PEL also applies to other hafnium compounds (as Hf).] | |||
| IDLH 50 mg/m3 (as Hf) See: 7440586 | Conversion | ||
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Physical Description Highly lustrous, ductile, grayish solid. |
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MW: 178.5 |
BP: 8316°F |
MLT: 4041°F |
Sol: Insoluble |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 13.31 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Explosive in powder form (either dry or with <25% water); finely divided powder can be ignited by static electricity or even SPONTANEOUSLY. | |||
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Incompatibilities & Reactivities Strong oxidizers, chlorine |
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Measurement Methods NIOSH S194 (II-5); OSHA ID121 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately |
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Important additional information about respirator selection Respirator Recommendations NIOSH/OSHA 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 supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode*/(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 50 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 In animals: irritation eyes, skin, mucous membrane; liver damage | |
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Target Organs
Eyes, skin, mucous membrane, liver |
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| See also: INTRODUCTION See ICSC CARD: 0847 |