# NIOSH Pocket Guide to Chemical Hazards
Calcium silicate | CAS 1344-95-2
CaSiO3 | RTECS VV9150000
Synonyms & Trade Names Calcium hydrosilicate, Calcium metasilicate, Calcium monosilicate, Calcium salt of silicic acid, Wollastonite (mineral) | 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 or cream-colored, free-flowing powder. [Note: The commercial product is prepared from diatomaceous earth & lime.]
MW: 116.2 | BP: ? | MLT: 2804°F | Sol: 0.01%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 2.9
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities None reported [Note: After prolonged contact with water, solution reverts to soluble calcium salts & amorphous silica.]
Measurement Methods NIOSH 7020; OSHA ID121
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, upper respiratory system
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION