Barium sulfate

  • Blanc fixe
  • Barytes
Formula
BaSO4
Structure
Description
Fine, heavy, yellowish powder or white polymorphous crystals.
Uses
Manufacture photographic papers, artificial ivory, cellophane, filler for rubber, linoleum, oil cloth, polymeric fibers & resins, paper, lithographic inks, as a water coloring pigment for colored paper, in wallpaper, as a size for modifying colors of other pigments, in heavy concrete for radioactive shield.

Registry Numbers and Inventories.
CAS
7727-43-7
EC (EINECS/ELINCS)
231-784-4
S 22 24/25
RTECS
CR0600000
RTECS class
Tumorigen; Drug; Mutagen
UN (DOT)
1564
Merck
13,997
Beilstein/Gmelin
8297 (G)
RCRA
D005
EPA OPP
7502
Swiss Giftliste 1
G-1826
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
BaO4S
Formula mass
233.40
Melting point, °C
1345
Decomposition point, °C
1580
Density
4.5 g/cm3 (25 C)
Solubility in water
Insoluble
Dielectric constant
10.25
Thermal expansion
7.5E-5/K (20 C)
Heat of fusion
40.6 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Do not get on skin or in eyes. Do not ingest or inhale.
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 impervious gloves. 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 at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Aluminum + heat.
Decomposition
Oxides of sulfur, barium fume.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Material will not burn. Extinguishing media: Use extinguishing media most appropriate for the surrounding fire.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
When heated to decompose it emits toxic fumes of sox.
Health
0
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: ppm; 10 mg/m3 (ACGIH 1996). OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp) NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
Poison_Class
-
Exposure effects
Repeated exposure may cause baritosis characterized by deposition of particulate matter in the lung.
   Ingestion
No hazard expected in normal industrial use.
   Inhalation
No hazard expected in normal industrial use.
   Skin
Dust may cause mechanical irritation.
   Eyes
Dust may cause mechanical irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. Get medical aid.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1564
Response guide
Hazard class
6.1
Packing Group
II; III
 
HS Code
2833 27 00