Hazard Overview: Silicon tetrachloride is strongly corrosive and presents acute toxicity hazards, including inhalation exposure. Water or moisture contact can cause a vigorous reaction and release hydrogen chloride fumes. Confirm the applicable hazard categories and label statements in the current SDS.
Handling: Use closed, dry transfer equipment with suitable ventilation and moisture exclusion. Select chemical-resistant protective clothing, eye and face protection, gloves, and respiratory protection according to the current SDS and the assessed operation.
Storage: Keep compatible containers tightly closed under dry, ventilated conditions, protected from moisture and heat. Follow the supplied grade's instructions for inert gas protection, container materials, and incompatible substances.
Transport Reference: UN 1818, SILICON TETRACHLORIDE; Class 8; Packing Group II. Confirm shipment classification, approved packaging, and labeling against the current SDS and applicable transport rules.
Emergency and Waste Procedures: Follow the current SDS and site procedures for exposure, leaks, spills, and waste handling. Water-reactive material requires trained response personnel and appropriate equipment.
Tetrachlorosilane CAS 10026-04-7
Silicon Tetrachloride (Tetrachlorosilane) CAS 10026-04-7 from Aure Chemical
Silicon tetrachloride, also known as tetrachlorosilane or STC, CAS 10026-04-7, is a molecular chlorosilane with the formula SiCl₄. This colorless, moisture-reactive liquid is used as a precursor for synthetic silica, optical-fiber preforms, and other silicon-containing materials. Product selection requires review of molecular impurities, trace elements, and the intended process. Aure Chemical supports China chemical sourcing and international export requirements through specification review, quality documentation, supplier coordination, and logistics planning.
Basic Information of Silicon Tetrachloride
The following information identifies silicon tetrachloride and summarizes selected reference properties. Quality limits and results from one production lot are presented in the Reference Quality Analysis section below.
| CAS No. | 10026-04-7 |
|---|---|
| EC No. | 233-054-0 |
| Molecular Formula | SiCl₄ |
| Molecular Weight | 169.90 g/mol |
| Appearance | Colorless, transparent liquid |
| Odor | Pungent |
| Melting Point | Approximately −70 °C (reference) |
| Boiling Point | Approximately 57.6 °C (reference) |
| Density | 1.483 g/mL at 25 °C (reference) |
| Water Reactivity | Reacts vigorously with water and moisture, releasing hydrogen chloride and forming silica-containing hydrolysis products |
| Flammability | Non-combustible according to reference safety data; water reactivity remains a significant handling hazard |
| Corrosivity | Corrosive to skin, eyes, and the respiratory tract |
| Transport Reference | UN 1818, SILICON TETRACHLORIDE, Class 8, Packing Group II; confirm against the current product SDS and applicable transport requirements |
| Chemical Structure |  |
Physical properties are reference information and are separate from batch acceptance criteria. Confirm the required purity basis, impurity limits, analytical methods, and packaging compatibility when qualifying a grade.
Reference Quality Analysis
The following parameters provide a technical reference for evaluating silicon tetrachloride, including appearance, reported purity, selected molecular impurities, wavenumber-based analytical entries, and trace element mass fractions. All results below relate to one production lot.
Appearance, Purity & Molecular Impurity Profile
| Test Item | Reported Specification | Reference Result |
|---|---|---|
| Appearance | Colorless, transparent liquid | Colorless, transparent liquid |
| Purity | > 99.9999% | > 99.9999% |
| Trichlorosilane | < 1 ppm | Not detected |
| Dichlorosilane | < 1 ppm | Not detected |
| Trimethylchlorosilane | < 1 ppm | Not detected |
| Methyltrichlorosilane | < 1 ppm | Not detected |
| High-boiling components | < 1 ppm | Not detected |
“Not detected” reproduces the wording of the reference report. Detection limits are not specified, and these results should not be interpreted as zero concentration.
Wavenumber-Based Parameters (Reported Values)
The reference report lists the following percentage values at specified wavenumbers. It does not identify whether the percentages represent transmittance or another measurement. The labels and values are therefore reproduced as reported and should not be interpreted as impurity mass percentages.
| Test Item | Reported Specification | Reference Result |
|---|---|---|
| SiCl₃OH (3666 cm⁻¹) | > 98% | 99.65% |
| CH aromat (3100–3020 cm⁻¹) | > 99% | 99.64% |
| CH aliphat (2970–2925 cm⁻¹) | > 98% | 99.63% |
| HCl diss (2860–2830 cm⁻¹) | > 98% | 99.62% |
| CO₂ diss (2338 cm⁻¹) | > 97% | 99.55% |
| Si(NCO)₄ (2295 cm⁻¹) | > 97% | 99.51% |
| SiHCl₃ (2257 cm⁻¹) | > 99% | 99.17% |
| Si(CH₃)Cl₃ (2023 cm⁻¹) | > 99% | 99.21% |
| Si₂OCl₆ (1540 cm⁻¹) | > 99% | 99.19% |
Trace Element Analysis
The following elemental results are reported as mass fractions in ppb. The individual specification limits and reporting precision are retained.
| Test Item | Reported Specification | Reference Result |
|---|---|---|
| Titanium (Ti) | < 0.1 ppb | < 0.10 ppb |
| Chromium (Cr) | < 0.3 ppb | < 0.10 ppb |
| Vanadium (V) | < 0.1 ppb | < 0.10 ppb |
| Iron (Fe) | < 1 ppb | 0.15 ppb |
| Nickel (Ni) | < 0.3 ppb | < 0.10 ppb |
| Aluminum (Al) | < 0.1 ppb | < 0.10 ppb |
| Cobalt (Co) | < 0.1 ppb | < 0.10 ppb |
| Copper (Cu) | < 0.1 ppb | < 0.10 ppb |
| Zinc (Zn) | < 0.1 ppb | < 0.10 ppb |
| Boron (B) | < 0.1 ppb | < 0.10 ppb |
| Manganese (Mn) | < 0.1 ppb | < 0.10 ppb |
| Germanium (Ge) | < 0.1 ppb | < 0.10 ppb |
| Phosphorus (P) | < 0.1 ppb | < 0.10 ppb |
The report does not state the analytical methods or the calculation basis for the reported purity. Please request clarification of these details, including the meaning of the wavenumber-based percentage values, where required for technical qualification.
These analytical values are provided for preliminary evaluation and do not guarantee specifications or results for every shipment. Contact Aure Chemical to confirm the applicable grade, quality requirements, and relevant batch-specific Certificate of Analysis (COA) before ordering.
Primary Applications of Silicon Tetrachloride
Silicon tetrachloride is used in processes that convert its silicon-chlorine functionality into silica, silicon, or other silicon compounds. Each application requires its own precursor specification and process qualification.
Optical-Fiber Preform Manufacturing:
Used as a volatile silicon precursor in vapor-phase processes that form silica for optical-fiber preforms. Molecular impurity screening and trace element control are relevant to precursor qualification; final optical performance depends on the complete material specification and manufacturing process.
Synthetic Fused Silica and Quartz Glass:
Used to produce synthetic silica glass for optical components and other technical glass applications. Appropriate precursor selection requires review of the impurity profile and the intended glass production process.
Fumed Silica Production:
Used as a raw material for pyrogenic silica through flame hydrolysis. The resulting silica can be formulated for applications such as rheology control and reinforcement, subject to the specification of the finished silica.
Silicon Deposition Processes:
Evaluated as a silicon source in selected chemical vapor deposition and epitaxial deposition processes. Semiconductor or photovoltaic use requires confirmation of process compatibility and application-specific impurity limits beyond the reference data shown here.
Silicon-Containing Chemical Synthesis:
Used as a starting material in selected routes to alkoxysilanes and other silicon compounds. Its reactive Si-Cl bonds require controlled reaction conditions and effective management of hydrogen chloride generated during conversion.
Aure Chemical: Silicon Tetrachloride Sourcing and Export Support
Aure Chemical is a chemical trading and export supply business. We coordinate with suppliers to review proposed silicon tetrachloride grades and the supporting documentation against buyer requirements.
Product Specification Review: Compare reported purity, molecular impurity limits, and trace element requirements with the proposed commercial grade.
Analytical Documentation: Coordinate requests for the relevant COA, available test method information, and clarification of reporting limits or measurement definitions.
Supplier Coordination: Confirm grade availability, order quantity, packaging options, and production or dispatch timing for the specific inquiry.
Packaging and Export Logistics: Coordinate compatible packaging, labeling, transport documentation, and shipping arrangements according to the current product SDS, destination, and carrier requirements.
Safety Documentation: Coordinate access to the current SDS for the proposed grade and supporting handling information. Facility procedures and application suitability should be assessed by the buyer's qualified technical personnel.
For a sourcing inquiry, please provide the intended application, required purity basis, individual impurity limits, order quantity, preferred packaging, and destination.
Safety, Handling & Documentation
Obtain the current SDS for the supplied grade before handling, storage, or transport. This overview does not replace the product SDS, workplace risk assessment, or emergency procedures.
Packaging
200 L steel drum
Final packaging, capacity and net weight are confirmed in the quotation and order.
