September 2010
NIOSH Publication Number 2010-168c

Calcium silicate

Synonyms & Trade Names
Calcium hydrosilicate, Calcium metasilicate, Calcium monosilicate, Calcium salt of silicic acid
CAS No.
1344-95-2
RTECS No.
VV9150000
DOT ID & Guide
Formula
CaSiO3
Conversion
IDLH
N.D.
See: IDLH INDEX
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)
Measurement Methods

NIOSH ID121
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.]
Exposure Routes
inhalation, skin and/or eye contact
Symptoms
irritation eyes, skin, upper respiratory system
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
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

Not available.

Important additional information about respirator selection

See also: INTRODUCTION   See ICSC CARD: 1401