Tetrabromosilane

  • Silicon tetrabromide
  • Perbromosilane
Formula
SiBr4
Structure
Description
Colorless, fuming liquid with an acrid odor.

Registry Numbers and Inventories.
CAS
7789-66-4
EC (EINECS/ELINCS)
232-182-4
R: 14 36/37/38
S: 7/8 26
UN (DOT)
3264
Merck
12,8643
Canada DSL/NDSL
NDSL
US TSCA
Listed
Korea ECL
Listed

Properties.
Formula
Br4Si
Formula mass
347.7
Melting point, °C
5
Boiling point, °C
154
Vapor pressure, mmHg
4.2 (25 C)
Density
2.812 g/cm3 (25 C)
Solubility in water
Reacts violently
Refractive index
1.5685 (13 C)
Partition coefficient, pKow
5.86
Heat of vaporization
38.9 kJ/mol

Hazards and Protection.
Storage
Store under dry inert gas. Keep container tightly sealed. Store in cool, dry conditions in well sealed containers.
Protection
Protective work clothing. Chemical protective gloves/full face protection. Safety glasses or goggles.
Small spills/leaks
Absorb with liquid-binding material (sand, diatomite, acid binders, universal binders, sawdust). Ensure adequate ventilation. Do not flush with water or aqueous cleansing agents.
Stability
Decomposition will not occur if used and stored according to specifications.
Incompatibilities
Water/moisture.
Decomposition
Reacts violently with water. Produces hydrogen bromide.

Fire.
Fire fighting
Product is not flammable. Use fire fighting measures that suit the surrounding fire. DO NOT use water. Wear self-contained respirator. Wear fully protective impervious suit.
Hazards
Reacts violently with water.
Health
3
 
Flammability
0
 
 
Reactivity
2
 
 
Special
W

Health.
Exposure effects
   Ingestion
Ingestion may cause damage to the mouth, throat and esophagus.
   Inhalation
Inhalation may result in respiratory effects such as inflammation, edema, and chemical pneumonitis. May cause coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting.
   Skin
May cause skin burns or irritation depending on the severity of the exposure.
   Eyes
Eye contact may result in permanent damage and complete vision loss.

First aid
 
   Ingestion
Seek medical treatment.
   Inhalation
Supply fresh air. If required, provide artificial respiration. Keep patient warm. Seek immediate medical advice.
   Skin
Immediately wash with water and soap and rinse thoroughly. Seek immediate medical advice.
   Eyes
Rinse opened eye for several minutes under running water. Then consult a doctor.

Transport.
UN number
3264
Response guide
Hazard class
8
Packing Group
II