NIOSH Pocket Guide to Chemical Hazards

Calcium silicate

CAS 1344-95-2


RTECS VV9150000
Synonyms & Trade Names
Calcium hydrosilicate, Calcium metasilicate, Calcium monosilicate, Calcium salt of silicic acid, Wollastonite (mineral)
DOT ID & Guide


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. See: IDLH INDEX 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)

Sp.Gr: 2.9
Fl.P: 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
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
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

Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 1401