Calcium sulfate

  • Drierite
Formula CaSO4
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
EC Safety Phrase S 22 24/25
RTECS WS6920000
RTECS class Other
Merck 13,1711
Beilstein/Gmelin 8293 (G)
EPA OPP 5602
Swiss Giftliste 1 G-4692
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed
Korea ECL Listed

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.
WHMIS 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 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.
NFPA Health 1
  Flammability 0  
  Reactivity 0  

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.

HS Code 2833 29 90