# NIOSH Pocket Guide to Chemical Hazards
Barium sulfate | CAS 7727-43-7
BaSO4 | RTECS CR0600000
Synonyms & Trade Names Artificial barite, Barite, Barium salt of sulfuric acid, Barytes (natural) | DOT ID & Guide 1564 154 (barium compounds, n.o.s.)
Exposure Limits | NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
OSHA PEL†: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
IDLH N.D. | Conversion
Physical Description White or yellowish, odorless powder.
MW: 233.4 | BP: 2912°F (Decomposes) | MLT: 2876°F | Sol(64°F): 0.0002%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 4.25-4.5
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities Phosphorus, aluminum [Note: Aluminum in the presence of heat can cause an explosion.]
Measurement Methods NIOSH 0500, 0600
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: Daily Remove: No recommendation Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, nose, upper respiratory system; benign pneumoconiosis (baritosis)
Target Organs Eyes, respiratory system
See also: INTRODUCTION