# NIOSH Pocket Guide to Chemical Hazards
Marble | CAS 1317-65-3
CaCO3 | RTECS EV9580000
Synonyms & Trade Names Calcium carbonate, Natural calcium carbonate [Note: Marble is a metamorphic form of calcium carbonate.] | DOT ID & Guide
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 Odorless, white powder.
MW: 100.1 | BP: Decomposes | MLT: 1517-2442°F (Decomposes) | Sol: 0.001%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 2.7-2.9
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities Fluorine, magnesium, acids, alum, ammonium salts
Measurement Methods NIOSH 0500, 0600
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: Fresh air
Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane, upper respiratory system; cough, sneezing, rhinorrhea (discharge of thin mucus); lacrimation (discharge of tears)
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION