Explore fully audited industrial materials, including electronic gases, atomized reactive metal powders, and high-performance crosslinking agents manufactured under ISO 9001 standards.
A deep technical analysis into tetrahedral fluorocarbon bonding, reaction kinetics, and fundamental thermodynamic parameters essential for sub-nanometer etching and dielectric applications.
The chemical formula for carbon tetrafluoride is CF₄ (CAS Registry Number: 75-73-0, UN 1982). Representing the simplest perfluorocarbon (PFC), CF₄ belongs to the halomethane family and is structurally organized as a symmetrical, non-polar tetrahedral molecule. The central carbon atom undergoes sp³ hybridization, forming four localized, equivalent σ-bonds with peripheral fluorine atoms at tetrahedral angles of 109.5°. Due to the remarkable electronegativity differential between carbon (2.55 on the Pauling scale) and fluorine (3.98), each individual C–F bond possesses a profound dipole moment; however, the vector summation of these four bond dipoles cancels out perfectly, granting the overall molecule zero net dipole moment.
This molecular configuration accounts for the extraordinary stability of carbon tetrafluoride. The C–F bond dissociation energy averages approximately 544 kJ/mol (130 kcal/mol), one of the strongest single covalent bonds in synthetic chemistry. As a direct consequence, CF₄ exhibits exceptional chemical inertia: it does not undergo hydrolysis in moisture, remains non-reactive with strong acids or bases at ambient temperatures, and resists thermal decomposition up to temperatures exceeding 800°C. In the industrial gas sector, carbon tetrafluoride is also classified under the ASHRAE designation R-14 (Freon-14).
| Thermodynamic & Physical Property | Standard Metric Value | Imperial / Engineering Units | Testing & Analytical Reference |
|---|---|---|---|
| Molecular Formula & Weight | CF₄ · 88.0043 g/mol | 88.0043 lb/lb-mol | High-Resolution Mass Spectrometry |
| Boiling Point (101.325 kPa) | -128.06 °C (145.09 K) | -198.51 °F | Cryogenic Distillation Equilibria |
| Freezing / Melting Point | -183.6 °C (89.55 K) | -298.48 °F | Triple Point Calorimetry |
| Critical Temperature (Tc) | -45.64 °C (227.51 K) | -50.15 °F | PVT Phase Isotherm Apparatus |
| Critical Pressure (Pc) | 3.74 MPa (37.4 bar) | 542.4 psia | High-Pressure Transducer Validation |
| Gas Density (15 °C, 1 atm) | 3.72 kg/m³ (3.05× air) | 0.232 lb/ft³ | ASTM D3588 Gas Chromatography |
| Liquid Density (-130 °C) | 1603 kg/m³ | 100.07 lb/ft³ | Cryogenic Pycnometry |
| Standard Enthalpy of Formation (ΔHf°) | -933.2 kJ/mol | -223.0 kcal/mol | Fluorine Bomb Calorimetry |
| Ozone Depletion Potential (ODP) | 0.00 (Zero ODP) | 0.00 | WMO Scientific Assessment |
| Global Warming Potential (GWP₁₀₀) | 6,630 (IPCC AR5) / 7,380 (AR6) | Atmospheric Lifetime: ~50,000 Years | FTIR Infrared Absorption Bands |
Comparative analysis of direct element fluorination, catalytic halogen exchange, and halocarbon cracking utilized in Chinese chemical manufacturing centers.
Reaction: C (s) + 2F₂ (g) → CF₄ (g) + ΔH (-933 kJ/mol)
Direct reaction between high-surface-area activated porous carbon or silicon carbide and elemental fluorine gas inside a fluidized-bed nickel-alloy reactor. Highly exothermic; requires fluid bed heat exchangers or inert gas diluents to prevent runaway runaway graphite combustion and C₂F₆, C₃F₈ byproduct formation.
Reaction: CCl₄ / CHCl₃ + HF → CF₄ + HCl
Vapor-phase reaction between chloromethanes (such as carbon tetrachloride CCl₄ or dichlorodifluoromethane CCl₂F₂) and anhydrous hydrogen fluoride (AHF) catalyzed by chromium oxide (Cr₂O₃) or aluminum fluoride (AlF₃) at 300°C–450°C. Dominates large-scale continuous manufacturing across integrated Chinese production clusters.
Reaction: (-CF₂-CF₂-)ₙ + Heat / Plasma → CF₄ + C₂F₄
Controlled thermal or plasma dissociation of virgin polytetrafluoroethylene (PTFE) scrap or fluoroalkyl oligomers under oxygen-free conditions at temperatures exceeding 700°C. Provides a circular economy route, producing high-grade crude CF₄ that undergoes subsequent fractional cryo-purification.
In modern high-capacity plants operated by leading Chinese manufacturers, the catalytic fluorination of chlorocarbons represents over 75% of domestic production volume. By utilizing vertically integrated upstream pipelines of anhydrous hydrogen fluoride (AHF) directly from inland acid-grade fluorspar reserves, Chinese chemical complexes generate crude CF₄ gas streams with 98.0%–99.2% assay. The critical industrial barrier is not merely synthesis, but the downstream removal of volatile contaminants: moisture (H₂O), trace air gases (N₂, O₂, Ar), fluorinated ethers, fluoroform (CHF₃), hexafluoroethane (C₂F₆), and acid halides (HF, COF₂).
Detailed evaluation of CF₄ in front-end wafer fabrication, photovoltaic texturing, advanced flat-panel displays, and ultra-deep cryogenic refrigeration loops.
In advanced node fabrication (sub-14nm, FinFET, and 3D NAND flash memory), CF₄ is dissociated within inductively coupled plasma (ICP) or capacitively coupled plasma (CCP) reactors to generate reactive atomic fluorine (F*) and CF₃⁺ ions. These species react with silicon dioxide (SiO₂), silicon nitride (Si₃N₄), and tungsten silicide layers via the chemical reaction: SiO₂ + CF₄ → SiF₄ ↑ + CO₂ ↑. This yields volatile byproducts that are evacuated, providing vertical anisotropic etching profiles with sub-nanometer sidewall accuracy.
Within high-efficiency monocrystalline TOPCon and Heterojunction (HJT) solar cell production, CF₄ blended with oxygen (O₂) is injected during the dry plasma edge isolation process. It etches away the parasitic emitter layer formed along the periphery of silicon wafers during phosphorus diffusion, preventing catastrophic short circuits. Concurrently, CF₄ texturing creates micro-scale roughness on the wafer surface, decreasing light reflectance and elevating module photoelectric conversion efficiency.
During the deposition of dielectric films via Plasma Enhanced Chemical Vapor Deposition (PECVD), heavy residual buildup accumulates along the aluminum or quartz reactor chamber walls. CF₄/O₂ plasma mixes break down these hard ceramic crusts into volatile gases without requiring manual disassembly. This minimizes fab tool downtime, eliminates particulate contamination in subsequent wafer batches, and protects capital-intensive lithography clusters.
With an atmospheric boiling point of -128°C and critical temperature of -45.6°C, CF₄ (R-14) is applied as the low-temperature stage working fluid in multi-stage cascade refrigeration cycles. It achieves continuous working temperatures between -120°C and -150°C. Typical deployments include biomedical bio-banking of cryo-preserved stem cells, cryogenic gas liquefaction, deep-space optical detector thermal sinks, and aerospace simulation environmental chambers.
Exposing advanced technical polymers, polyolefin fuel tanks, PTFE filtration membranes, and elastomer seals to mild CF₄ plasma modifies the topmost surface chemistry without impacting bulk mechanical flexibility. Fluorine radicals replace superficial hydrogen atoms, generating a dense, chemically impervious fluorinated barrier layer that dramatically suppresses hydrocarbon fuel permeation and enhances chemical corrosion resistance.
In nuclear instrumentation and particle physics experiments (such as wire chambers, Time Projection Chambers, and Cherenkov counters), high-purity carbon tetrafluoride is utilized as a primary scintillation and drift counting gas. CF₄ offers high electron drift velocity, low diffusion constants, and robust quenching against micro-discharges, allowing fast particle tracking under intense beam radiation.
How leading Chinese synthesis facilities eliminate sub-ppm volatile organic impurities, moisture, and critical fluorocarbon contaminants to satisfy tier-1 semiconductor demands.
In electronic applications, the difference between 99.9% (3N) industrial-grade CF₄ and 99.999% (5N) or 99.9999% (6N) electronic-grade gas is the threshold between acceptable silicon yield and catastrophic wafer loss. Sub-ppm levels of moisture (H₂O) form hydrofluoric acid (HF) in gas delivery lines, causing valve seizure and particulate defects. Oxygen and carbon monoxide contaminants alter the optical emission spectrometry (OES) endpoint detection within plasma chambers, skewing selective etch ratios between SiO₂ and Si₃N₄.
| Impurity Parameter | Industrial Grade (3N / 4N) | Electronic Grade (5N) | Semiconductor VLSI Grade (5N5) | Analytical Instrument Method |
|---|---|---|---|---|
| Assay Purity (CF₄) | ≥ 99.9% | ≥ 99.999% | ≥ 99.9995% (up to 99.9999%) | Gas Chromatography (TCD / DID) |
| Oxygen (O₂) + Argon (Ar) | ≤ 100.0 ppmv | ≤ 1.0 ppmv | ≤ 0.2 ppmv | Trace Zirconia / Electrochemical O₂ |
| Nitrogen (N₂) | ≤ 300.0 ppmv | ≤ 3.0 ppmv | ≤ 0.5 ppmv | Gas Chromatography with DID / PDHID |
| Moisture (H₂O) | ≤ 10.0 ppmv | ≤ 1.0 ppmv | ≤ 0.2 ppmv | Cavity Ring-Down Spectroscopy (CRDS) |
| Carbon Monoxide (CO) | ≤ 10.0 ppmv | ≤ 0.5 ppmv | ≤ 0.1 ppmv | Fourier-Transform Infrared (FTIR) |
| Carbon Dioxide (CO₂) | ≤ 20.0 ppmv | ≤ 0.5 ppmv | ≤ 0.1 ppmv | Fourier-Transform Infrared (FTIR) |
| Other Halocarbons (C₂F₆, CHF₃) | ≤ 50.0 ppmv | ≤ 3.0 ppmv | ≤ 0.5 ppmv | GC-Mass Spectrometry (GC-MS) |
| Acidity (calculated as HF) | ≤ 1.0 ppmv | ≤ 0.1 ppmv | ≤ 0.05 ppmv | Ion Chromatography (IC) |
Understanding the structural cost foundations, fluorspar reserves, and current wholesale pricelist indicators across China's specialty gas hubs.
The global production ecosystem for carbon tetrafluoride is fundamentally tethered to the availability of acid-grade fluorspar (calcium fluoride, CaF₂ > 97%). Fluorspar is reacted with concentrated sulfuric acid to generate anhydrous hydrogen fluoride (AHF), the basic feedstock for nearly all industrial fluorochemicals. The People's Republic of China controls over 60% of the world's mineable fluorspar reserves and refined AHF production capacity, located primarily across the mineral-rich geological belts of Jiangxi, Zhejiang, Fujian, and Inner Mongolia.
This geographic concentration creates an insurmountable supply chain moat. While non-integrated international gas blenders must import high-cost AHF or crude PFC feedstocks across long transoceanic routes—exposing them to ocean freight volatility, geopolitical tariffs, and customs bottlenecks—Chinese manufacturers like Yanxatech operate adjacent to upstream fluorination clusters. This allows direct pipeline delivery of raw reactants, dramatically depressing the unit production cost per kilogram.
| Purity Grade Specification | Primary Industrial Sector | Standard Packaging Vessel | Indicative Price Benchmark (FOB China Port)* | Typical Order Lead Time |
|---|---|---|---|---|
| Industrial Grade (99.9% / 3N) | Polymer Treatment, Cryogenic R-14 | 40L / 47L Steel Cylinder (25-30 kg) | $11.50 – $14.80 / kg | 7 – 10 Business Days |
| Photovoltaic Grade (99.99% / 4N) | Solar Cell Edge Isolation, Flat Panel | 47L / 50L High-Pressure Cylinder | $15.20 – $19.50 / kg | 10 – 14 Business Days |
| Electronic Grade (99.999% / 5N) | Legacy Wafer Fab, SiN/SiO₂ Etch | 47L Cylinder (CGA 580 / DISS 638) | $22.00 – $28.50 / kg | 14 – 18 Business Days |
| VLSI / ULSI Grade (99.9995%+ / 5N5) | Advanced 3nm/5nm Logic, 3D NAND | 47L Cr-Mo / Electropolished 316L | $32.00 – $44.00 / kg | 18 – 25 Business Days |
| Bulk Supply Ton-Tank (5N) | High-Volume Fab Mega-Projects | Y-Ton Tank (400 kg – 600 kg net) | $18.80 – $24.00 / kg | 25 – 30 Business Days |
*Disclaimer: Benchmark pricing is indicative for enterprise FCL/LCL orders; final contract pricing fluctuates based on global fluorspar raw material indices, energy costs, cylinder lease terms, and requested batch certification documentation.
International regulatory standards, valve engineering, safety management, and localized customer support framework provided by Yanxatech.
Carbon tetrafluoride is classified under UN Model Regulations as UN 1982, Class 2.2 Non-Flammable, Non-Toxic Gas. While chemically non-toxic and non-flammable, CF₄ is a heavy asphyxiant gas stored under elevated pressure (typically 10.0–13.7 MPa / 1,450–2,000 psi). Shipments require maritime IMDG Code certification, authorized stowage Category A, and compliant GHS hazard labeling.
We supply seamless manganese-steel and chromium-molybdenum steel cylinders engineered to ISO 9809-1 / DOT-3AA specifications. Internal cylinder walls for electronic grades undergo ultrasonic cleaning, vacuum baking at 150°C, and passivation. Cylinders are fitted with brass or stainless steel valves including CGA 580, CGA 320, DISS 638, or DIN 477 No. 6 connections according to regional destination standards.
Every export lot is accompanied by a comprehensive Batch Certificate of Analysis (COA) detailing exact GC-DID trace impurity levels, a GHS 16-section Safety Data Sheet (SDS), and a Certificate of Origin. We facilitate third-party pre-shipment inspections (SGS, TÜV, Bureau Veritas) at Chinese departure ports (Shanghai, Qingdao, Ningbo) to guarantee zero specification discrepancies.
Direct answers to core inquiries regarding formula parameters, shelf life, cylinder return programs, and cross-border delivery.
The chemical formula is CF₄ (one carbon atom covalently bonded to four fluorine atoms in a symmetrical sp³ tetrahedral geometry). Its international CAS Registry Number is 75-73-0, EINECS Number is 200-896-5, and UN transportation code is UN 1982.
CF₄ provides an optimal balance between fluorine-radical generation and fluoropolymer deposition. When cracked in plasma, it yields active F* radicals that readily volatilize SiO₂ into SiF₄ gas. Compared to higher fluorocarbons (such as C₄F₈ or C₄F₆), CF₄ exhibits lower polymer-forming tendencies, making it easier to control in high-throughput etching.
Moisture (H₂O) is the most critical impurity in sub-micron semiconductor fabrication. In the presence of high-frequency plasma or high pressure, H₂O reacts with fluorinated intermediates to produce anhydrous HF, eroding gas manifolds, degrading silicon wafer uniformity, and generating micro-corrosion pits on chamber surfaces. Yanxatech restricts moisture to < 0.2 ppm in 5N5 grades.
Pricing is governed by three primary pillars: (1) Spot market pricing of upstream acid-grade fluorspar and anhydrous hydrofluoric acid (AHF); (2) Purity specification overhead, as moving from 4N to 5N5 requires multi-column cryogenic distillation with lower gas yields; and (3) International certified packaging compliance (DOT/ISO cylinders) and maritime dangerous-goods surcharges.
Yes. Depending on destination semiconductor fab standards or regional gas codes, we assemble and deliver cylinders with brass or 316L stainless steel valves conforming to CGA 580, CGA 320, DISS 638, DIN 477 No. 6, or JIS B 8246 standards, verified for ultra-high-leak integrity via helium mass spectrometry.
Because of its immense thermodynamic stability (C–F bond of 544 kJ/mol), carbon tetrafluoride itself does not chemically degrade over time. In certified, properly passivated steel cylinders, the guaranteed specification shelf life is 36 months. Cylinders must be stored in cool, dry, well-ventilated dedicated chemical warehouses below 50°C (122°F), protected from direct solar insolation.
Access additional high-purity inorganic salts, functional liquid polymers, and specialized alloy powders engineered for aerospace, battery, and advanced metallurgical lines.
Navigating stringent environmental mandates (F-gas regulations) alongside surging global demand for ultra-pure fluorocarbon chemistry.
As semiconductor lithography migrates toward High-NA EUV, 2nm GAA (Gate-All-Around) architectures, and vertical 3D NAND surpassing 300 layers, the demand for precision fluorochemical dry etching continues to experience double-digit compound annual growth. However, this technical trajectory intersects with stringent global climate policies, specifically the Kigali Amendment to the Montreal Protocol and revised European F-gas Regulations. Given that carbon tetrafluoride possesses a 100-year Global Warming Potential (GWP₁₀₀) of 6,630–7,380 and an atmospheric lifetime approximating 50,000 years, the global semiconductor industry is advancing along a dual-track strategy:
1. Point-of-Use (POU) High-Efficiency Thermal-Electrochemical Abatement: Leading fab facilities are integrating high-temperature plasma-thermal scrubbers directly at the roughing pump exhaust of dry etch tools. Operating at combustion temperatures above 1,300°C in the presence of water vapor and methane, these units crack the 544 kJ/mol C–F bond, converting CF₄ into easily scrubbed aqueous hydrofluoric acid (HF) and carbon dioxide: CF₄ + 2H₂O → CO₂ + 4HF. Conversion efficiencies exceeding 99.5% are now routinely achieved in tier-1 fabs across Taiwan, South Korea, mainland China, and the United States.
2. Advanced Alternative Etch Gases vs. Unmatched CF₄ Selectivity: While researchers continue to evaluate lower-GWP alternatives such as iodotrifluoromethane (CF₃I) or perfluorobutadiene (C₄F₆) for specific high-aspect-ratio hole etching, CF₄ remains irreplaceable in critical silicon nitride stripping, bevel cleaning, and polysilicon recessing due to its low molecular weight, lack of polymer residue, and predictable, highly stable dissociation kinetics. Through continuous plant modernizations, Chinese producers are implementing closed-loop purification systems that capture process emissions during manufacturing, driving domestic carbon-neutral targets while guaranteeing reliable global supplies.
Yanxatech System Industries Limited remains dedicated to advancing this technological equilibrium. By bridging domestic raw material resources with international quality management, batch-level trace analysis, and multi-standard cylinder engineering, we provide global industrial clients with unmatched supply assurance and technical expertise for their most demanding fluorochemical requirements.
