# NIOSH Pocket Guide to Chemical Hazards
Zirconium compounds (as Zr) | CAS 7440-67-7 (Metal)
Zr (Metal) | RTECS ZH7070000 (Metal)
Synonyms & Trade Names Zirconium metal: Zirconium Synonyms of other zirconium compounds vary depending upon the specific compound. | DOT ID & Guide 1358 170 (powder, wet) 1932 135 (scrap) 2008 135 (powder, dry)
Exposure Limits | NIOSH REL*: TWA 5 mg/m3 ST 10 mg/m3 [*Note: The REL applies to all zirconium compounds (as Zr) except Zirconium tetrachloride.]
OSHA PEL†: TWA 5 mg/m3
IDLH 50 mg/m3 (as Zr) | Conversion
Physical Description Metal: Soft, malleable, ductile, solid or gray to gold, amorphous powder.
MW: 91.2 | BP: 6471°F | MLT: 3375°F | Sol: Insoluble
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 6.51 (Metal)
Fl.P: NA | UEL: NA | LEL: NA |
Metal: Combustible, but solid form is difficult to ignite; however, powder form may ignite SPONTANEOUSLY and can continue burning under water.
Incompatibilities & Reactivities Potassium nitrate, oxidizers [Note: Fine powder may be stored completely immersed in water.]
Measurement Methods NIOSH 7300; OSHA ID121
Personal Protection & Sanitation Recommendations regarding personal protective clothing vary depending upon the specific compound. Recommendations regarding eye protection vary depending upon the specific compound. Recommendations regarding washing the skin vary depending upon the specific compound. Recommendations regarding the removal of personal protective clothing that becomes wet or contaminated vary depending upon the specific compound. Recommendations regarding the daily changing of personal protective clothing vary depending upon the specific compound. Recommendations regarding the need for eyewash or quick drench facilities vary depending upon the specific compound. | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 25 mg/m3: (APF = 5) Any dust and mist respirator Up to 50 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter/(APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 10) Any supplied-air respirator/(APF = 50) Any self-contained breathing apparatus with a full facepiece 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
Exposure Routes inhalation, skin and/or eye contact
Symptoms Skin, lung granulomas; in animals: irritation skin, mucous membrane; X-ray evidence of retention in lungs
Target Organs Skin, respiratory system
See also: INTRODUCTION