Silicon(IV) bromide 

Synonym: Tetrabromosilane, Silicon tetrabromide, Silicon bromide, SiBr4

CAS Number 7789-66-4 | MDL Number MFCD00049530 | EC Number 232-182-4

Silicon Bromide

Product codeSI9664
CAS number7789-66-4
Assay (purity)99%+
Purity methodby titration: %Br=91.0-92.8
Metal purity99.99+%-Si
Molecular weight347.70
Appearancecolorless liquid
Boiling point153 °C
Melting point5 °C
Molecular formulaBr4Si
Linear formulaSiBr4
Packagingglassware/metal containers/bubblers

Silicon(IV) bromide due to it’s close similarity to Silicon Tetrachloride has several unique features, applicable in the production of ultrapure silicon for the manufacture of semiconductor devices. This product has an advantage over SiCl4 in the speed of silicon deposition. Pyrolysis of Silicon(IV) bromide followed by treatment with ammonia yields Silicon Nitride (Si3N4) coatings. This hard compound is used for ceramics, sealants, and the production of many cutting tools. It is also used in water treatment, chemical analysis and in ultra high purity for certain crystal growth applications. Synthesis of this product has been reported (see the links below).

Ereztech manufactures and sells of Silicon(IV) bromide in small and bulk volumes. Glass ampules and bottles or metal ampules and bubblers are available for packaging. For additional information or details about purchasing Silicon(IV) bromide contact us at

Safety information

Hazardous class8
Packing groupII
Signal wordDANGER
Hazard statementsH314-H318
Precautionary statements

P260-P264-P280-P301 + P330 + P331-P301 + P330 + P331-P303 + P361 + P353-P304 + P340-P305 + P351 + P338- P310-P403 + P233 + P235-P405-P501

Transport descriptionCORROSIVE LIQUID, ACIDIC, INORGANIC, N.O.S. (Silicon(IV) bromide)
In TSCA registryYes

First Aid Measures

General adviceConsult a physician. Show this safety data sheet to the doctor in attendance. Move out of dangerous area.
Eye contactRinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Skin contactWash off with soap and plenty of water. Consult a physician.
InhalationIf breathed in, move person into fresh air. If not breathing, give artificial respiration. Consult a physician.
If swallowedDo NOT induce vomiting. Never give anything by mouth to an unconscious person. Rinse mouth with water. Consult a physician.


Certificates of analysis (CoA)

If you don’t see the needed lot of Silicon(IV) bromide below please contact customer support at

Lot# 005/613 Lot# 234RP2Si56419

External identifiers for Tetrabromosilane 

Pubchem CID82247
IUPAC NameSilicon tetrabromide
InchI IdentifierInChI=1S/Br4Si/c1-5(2,3)4

Known applications and external links

With Silicon(IV) bromide other customers often ask:

Ereztech synthesizes and sells additional Si-compounds.

To purchase Silicon(IV) bromide contact us at