# NIOSH Pocket Guide to Chemical Hazards
Kaolin | CAS 1332-58-7
| RTECS GF1670500
Synonyms & Trade Names China clay, Clay, Hydrated aluminum silicate, Hydrite, Porcelain clay [Note: Main constituent of Kaolin is Kaolinite (Al2Si2O5(OH)4).] | 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 White to yellowish or grayish powder. [Note: When moistened, darkens & develops a clay-like odor.]
MW: varies | BP: ? | MLT: ? | Sol: Insoluble
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 1.8-2.6
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities None reported
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 Breathing: Fresh air
Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms Chronic pulmonary fibrosis, stomach granuloma
Target Organs respiratory system, stomach
See also: INTRODUCTION