# NIOSH Pocket Guide to Chemical Hazards
Perlite | CAS 93763-70-3
| RTECS SO5254000
Synonyms & Trade Names Expanded perlite [Note: An amorphous material consisting of fused sodium potassium aluminum silicate.] | 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, light-gray to glassy-black solid. [Note: Expanded perlite is a fluffy, white particulate.]
MW: varies | BP: ? | MLT: >2000°F | Sol: <1%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 2.2-2.4 (crude) 0.05-0.3 (expanded)
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 Irritation eyes, skin, throat, upper respiratory system
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION