Are silicon tribromide and tribromosilane the same substance with the same CAS number?

Yes. Silicon tribromide and tribromosilane are different naming conventions for the same compound and correspond to the same CAS‑registered substance.

Is silicon tribromide intended for industrial deposition processes rather than laboratory synthesis only?

Silicon tribromide is typically used as an industrial chemical precursor in controlled thin‑film deposition systems where defined silicon source reactivity is required.

Silicon Tribromide CAS 7789-68-6

Silicon Tribromide is an inorganic chemical compound, silicon precursor, and halosilane intermediate used in controlled semiconductor manufacturing processes. Identified by CAS 7789-68-6, its reactive Si–Br bonds enable gas‑phase decomposition and surface reactions under defined conditions, allowing silicon incorporation through thermally or plasma‑activated mechanisms. In industrial production environments, it is commonly applied in thin‑film deposition processes, where precise precursor chemistry is required for silicon‑containing layer formation. The material is supplied with competitive factory pricing, supports customized specifications, and is provided with complete MSDS, TDS, COA documentation for bulk supply.

CAS: 7789-57-3
Synonyms: Silicon tribromide, Tribromosilane, Tris(bromo)silane, Hydrogentribromosilane
Einecs: 232-182-4
Molecular Formula: HSiBr3
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packaging

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Product Description

1 Physicochemical properties

2 Application Areas

3 Storage conditions

4 Safety precautions

Physicochemical properties

Property	Description
Chemical Name	Silicon Tribromide
Synonyms	Tetrabromosilane; Silicon Bromide; Tetrabromo-silan; Silane, Tetrabromo-
CAS Number	7789-66-4
Molecular Formula	HSiBr3
Molecular Weight	347.7 g/mol
Appearance	Colorless to pale yellow liquid (turns yellow in air)
Odor	Unpleasant odor
Density	2.8 g/mL at 25 °C (lit.)
Melting Point	5 °C (lit.)
Boiling Point	153 °C (lit.)
Refractive Index	1.5627
Solubility	Reacts with water to decompose into HBr and silicic acid, with evolution of heat
Stability	Stable under normal conditions, but reacts rapidly with moisture, water, and protic solvents
Hazard Class	Corrosive (C)
UN Number	UN 3264 8/PG 2
Safety Precautions	Keep away from heat, sparks, and open flames. Store in a cool, dry, and well-ventilated area. Use appropriate personal protective equipment (PPE) such as gloves, goggles, and protective clothing when handling.

Application Areas

Organic synthesis: used as a brominating agent for the preparation of organic bromides or as a catalyst.
Semiconductor industry: used for surface treatment of silicon wafers or chemical vapor deposition (CVD).
Photolithography technology: used for etching or doping in microelectronic manufacturing

Storage conditions

Environmental requirements: Store in a cool, dry, well ventilated warehouse, away from sources of fire and heat.
Packaging requirements: Use glass or metal containers with good sealing to avoid contact with moisture.
Temperature control: It is recommended that the warehouse temperature be ≤ 30 ℃ and the relative humidity be ≤ 75%.
Isolation storage: Store separately from oxidants, acids, and bases to prevent reactions.

Safety precautions

Personal protection: Wear a gas mask, chemical protective gloves, goggles, and corrosion-resistant protective clothing during operation.
Operating environment: Conduct experiments in a fume hood to avoid inhaling vapors.
Fire and explosion prevention: Keep away from open flames and high temperatures, smoking is prohibited.
Leakage treatment: Minor leakage: Collect and treat with sand and dry lime after adsorption. Large amount of leakage: build a dike, cover it with foam, and transfer it with explosion-proof pump.

FAQ - Technical & Supply Chain

Q:
Are silicon tribromide and tribromosilane the same substance with the same CAS number?

A: Yes. Silicon tribromide and tribromosilane are different naming conventions for the same compound and correspond to the same CAS‑registered substance.
Q:
Is silicon tribromide intended for industrial deposition processes rather than laboratory synthesis only?

A: Silicon tribromide is typically used as an industrial chemical precursor in controlled thin‑film deposition systems where defined silicon source reactivity is required.

Documents

Documents and Product Support

For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.

COA for batch-based quality reference
TDS for key physical and chemical information
SDS / MSDS for handling, storage, and safety reference
Packing information for sample, trial, and bulk orders
Technical communication based on application and specification requirements

Quotation

Information to Confirm Before Quotation

Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.

Product name and CAS number
Application or intended end use
Required purity, grade, or specification
Sample quantity, trial order, or bulk demand
Preferred packing form or net weight
Destination country or port
Required documents or compliance expectations

Storage & Handling

Packaging, Storage, and Handling Notes

Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.

Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.

Supply Support

Sample, Bulk Order and Repeat Supply Support

Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.

For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.

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Inorganic Bromide Silicon Bromide Silicon Halide

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