Calcium sulfate

  • Drierite
Formula
CaSO4
Structure
Description
White, odorless powder. Mineral form is crystalline and color varies, hygroscopic.
Uses
Heavy clay soil conditioner. Drying agent.

Registry Numbers and Inventories.
CAS
7778-18-9
EC (EINECS/ELINCS)
231-900-3
S 22 24/25
RTECS
WS6920000
RTECS class
Other
Merck
13,1711
Beilstein/Gmelin
8293 (G)
EPA OPP
5602
Swiss Giftliste 1
G-4692
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CaO4S
Formula mass
136.14
Melting point, °C
1350
Vapor pressure, mmHg
8 (1000 C)
Density
2.964 g/cm3 (20 C)
Solubility in water
0.25 g/L

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Does not meet criteria
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions.
Disposal code
14
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents - diazomethane vapor - strong acids - aluminum when heated - mixtures of calcium sulfate and phosphorus ignites at high temperatures.
Decomposition
Oxides of sulfur.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Use extinguishing media most appropriate for the surrounding fire.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
Poison_Class
-
Exposure effects
Inhalation of dust may cause chronic rhinitis.
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. Inhalation of dust may cause respiratory tract irritation. Exposure may result in laryngitis, pharyngitis, impaired sense of smell and taste, bleeding from nose, and reactions of trachea, and bronchial membranes.
   Skin
May cause skin irritation.
   Eyes
Dust may cause mechanical irritation. May cause conjunctivitis.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
HS Code
2833 29 90