Calcium sulfide

Formula
CaS
Structure
Description
White-yellow cubic crystals, hygroscopic
Uses
Substance is used in phosphors.

Registry Numbers and Inventories.
CAS
20548-54-3
EC (EINECS/ELINCS)
243-873-5
EC Index Number
016-004-00-0
EC Class
Contact with acids liberates toxic gas; Irritant; Dangerous for the Environment
Merck
12,1754
Beilstein/Gmelin
13645 (G)
Swiss Giftliste 1
G-7053
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CaS
Formula mass
72.14
Melting point, °C
2450
Density
2.4 - 2.5 g/cm3
Solubility in water
Decomposes
Thermal expansion
0.000017/K

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. 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
Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal.
Stability
Unstable. Oxidizes in dry air; decomposes in moist air.
Incompatibilities
Chromyl chloride, lead dioxide, potassium chlorates, oxidizing agents, potassium nitrate.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide, calcium hydroxide.

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.
Poison_Class
2
Exposure effects
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
The toxicological properties of this substance have not been fully investigated.
   Skin
No information regarding skin irritation and other potential effects was found.
   Eyes
No information regarding eye irritation and other potential effects was found.

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.
   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 immediately. 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.