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Gypsum

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Synonyms & Trade Names
Calcium(II) sulfate dihydrate, Gypsum stone, Hydrated calcium sulfate, Mineral white [Note: Gypsum is the dihydrate form of calcium sulfate; Plaster of Paris is the hemihydrate form.]
CAS No.
13397-24-5
RTECS No.
MG2360000
DOT ID & Guide
Formula
CaSO₄ • 2H₂O
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 0500 , 0600
See: NMAM or OSHA Methods
Physical Description
White or nearly white, odorless, crystalline solid.
Molecular Weight
172.2
Boiling Point
?
Melting Point
262-325°F (Loses H2O)
Solubility
(77°F): 0.2%
Vapor Pressure
0 mmHg (approx)
Ionization Potential
NA
Specific Gravity
2.32
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Noncombustible Solid
Incompatibilities & Reactivities
Aluminum (at high temperatures), diazomethane
Exposure Routes
inhalation, skin and/or eye contact
Symptoms
irritation eyes, skin, mucous membrane, upper respiratory system; cough, sneezing, rhinorrhea (discharge of thin nasal mucus)
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

Breathing:Fresh air
Respirator Recommendations

Not available.

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 1215
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health