| HS Code | 533830 |
| Product Name | Fluorinated Gas |
| Chemical Class | Fluorinated organic and inorganic compounds containing fluorine atoms |
| Examples | HFCs, PFCs, SF6, NF3 |
| Primary Uses | Refrigerants, foam blowing agents, electrical insulation, semiconductor manufacturing |
| Global Warming Potential | Varies widely; many have high GWP ranging from 100 to over 23,500 times CO2 |
| Atmospheric Lifetime | Varies from several years to thousands of years depending on specific compound |
| Boiling Point Range | Varies widely by compound, roughly -188°C to -26°C |
| Density Relative To Air | Generally denser than air |
| Solubility In Water | Generally low to very low |
| Ozone Depletion Potential | Zero for most fluorinated gases |
| Flammability | Most are non-flammable; some hydrofluorocarbons are mildly flammable |
| Safety Considerations | May displace oxygen in enclosed areas; thermal decomposition can release toxic hydrogen fluoride |
| Regulatory Framework | Controlled under the Kyoto Protocol and EU F-Gas Regulation |
As an accredited Fluorinated Gas factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Fluorinated gas supplied in a 50 kg high-pressure steel cylinder, fitted with a protective valve cap and hazard labeling. |
| Container Loading (20′ FCL) | 20′ FCL: fluorinated gas cylinders securely loaded, labeled, ventilated, and blocked to prevent movement, complying with hazardous goods regulations. |
| Shipping | Fluorinated Gas is shipped as a compressed or liquefied gas under pressure, requiring certified cylinders or cryogenic containers. Transport must comply with hazardous material regulations, include proper hazard labeling, and ensure secure ventilation. Leak prevention is critical, as these gases are potent greenhouse gases and may pose health or safety risks. |
| Storage | Fluorinated gases are typically stored as liquefied compressed gases in sealed, pressure-rated cylinders or containers. Storage areas should be cool, dry, well-ventilated, and protected from direct sunlight and ignition sources. Cylinders must be secured upright, clearly labeled, and regularly checked for leaks. Strict inventory controls and compliance with F-gas regulations are essential to prevent fugitive emissions and environmental release. |
| Shelf Life | Fluorinated gases are highly stable; shelf life is typically long—years—if stored in sealed containers under proper conditions. |
On 300 mm plasma-enhanced chemical vapour deposition lines, fluorinated gas mixtures are metered into remote plasma sources for dielectric etch and chamber cleaning. Nitrogen trifluoride is split between high-flow clean steps after silicon nitride or silicon dioxide deposition and low-flow etch recipes. The remote plasma source excites the gas stream at 13.56 MHz or microwave frequency. The dissociation produces atomic fluorine without adding hydrogen-bearing species. The absence of hydrogen shifts the foreline chemistry away from aggressive hydrofluoric acid formation in dry conditions. This shift influences exhaust line material selection. Heated stainless steel forelines may still accumulate solid fluoride particulates. The particulate load is higher when residual silicon nitride hydration occurs before complete pump-down. Combustion abatement units downstream are sized for the remaining perfluorocompound fraction. Abatement performance is validated by Fourier transform infrared spectroscopy at the stack. Gas delivery components are controlled to avoid particle and moisture contribution beyond the gas specification used on the production line. Equipment exhaust safety is governed by SEMI S2 and related SEMI gas supply specifications.
Octafluorocyclobutane and hexafluoroethane serve in dielectric etch because their C:F ratios determine sidewall polymer deposition rates. A higher C:F ratio increases passivation. A lower C:F ratio raises the isotropic etch component. Process engineers adjust the C:F ratio to control via profile taper through the entire dielectric stack. Sulfur hexafluoride is applied where deep silicon etching requires high sputter yield. The gas is often pulsed with octafluorocyclobutane in time-multiplexed deep reactive ion etching. The pulse sequence builds a passivation layer, then removes the bottom layer with fluorine radicals. The process window for sidewall angle is narrow. Variation in chamber wall temperature beyond ±5 °C has been observed to shift the passivation removal rate on older etch platforms. This is a known chamber matching issue when batch-to-batch sidewall roughness must be controlled. The clean endpoint is detected by optical emission spectroscopy of fluorine radical emission. Over-etching consumes chamber quartz parts. Quartz erosion rate increases with fluorine radical density and clean time. This operational boundary is managed by clean time limits and endpoint shutoff.
Sulphur hexafluoride is filled into gas-insulated switchgear because its dielectric strength exceeds that of air at the same pressure. The gas is also used for arc cooling during current interruption. New gas quality under IEC 60376:2018 is specified for moisture, acidity, air and tetrafluoromethane. The fill is not a one-time operation. Leakage rates are monitored through density transmitters connected to GIS compartments. A drop in density below the alarm threshold indicates loss of insulation coordination. Reclaimed gas is classified under IEC 60480:2019 before it can be reused or destroyed. On production assembly lines, GIS compartments are evacuated to low vacuum before filling. The evacuation step removes water adsorbed on epoxy insulators. If the vacuum hold time is shortened, moisture migrates into the gas phase later. This moisture reacts with arc decomposition products to form acidic species. Gas handling carts are therefore specified with filter trains for sulfur oxyfluorides and hydrogen fluoride. Their adsorbent beds require periodic regeneration. Field dew point is commonly held below -50 °C at rated filling pressure. Partial discharge measurement is performed under IEC 60270:2000 to verify insulation integrity after assembly.
Operational boundaries include low-temperature liquefaction at high fill pressures. The gas density in a cold climate must stay above the minimum operating density for the breaker mechanism. Manufacturer pressure-temperature curves are used rather than simple pressure gauges. GIS enclosures should not be opened without gas recovery because decomposition products are toxic. The work sequence is regulated under site lockout procedures and gas handling permits. Arc decomposition during breaker operation consumes a small fraction of SF6. The decomposition products must be removed from the gas handling cart before re-fill. Used gas with excessive decomposition products is sent for destruction. This gas is not vented. SF6 is a potent infrared absorber, and decomposition products are toxic. Emission reporting is conducted under national inventory frameworks. Published data for this specific configuration is limited to manufacturer maintenance manuals and utility operating experience.
Tetrafluoroethylene arriving at polymerisation plants is not treated as a routine feedstock gas. The molecule can undergo autopolymerisation and exothermic decomposition if the inhibitor concentration is inadequate. Polymerisation-grade tetrafluoroethylene is therefore stabilised with a compatibility terpene. Storage vessels are temperature-controlled and oxygen-limited. The gas is produced by pyrolysis of chlorodifluoromethane, usually in a tubular reactor. The cracked gas is quenched and separated. Tetrafluoroethylene has a boiling point of -76.3 °C and is handled under pressure as a liquefied gas in dedicated systems. Suspension polymerisation of tetrafluoroethylene into granular PTFE uses an aqueous phase, an initiator, and reactor pressure control. The process is operated as a batch reaction in an autoclave. The heat release from the polymerisation must be removed through the jacket. Agitation is controlled to maintain the particle size distribution. If the agitator stops during the reaction, the dispersion can flocculate. If the oxygen level rises during transfer, the stabiliser can be consumed. The resulting monomer can form low-molecular-weight oligomers at the vapour space walls. These operational constraints are embedded in the polymerisation control system. Pressure relief is directed to a flare or scrubber.
Granular PTFE resins are assessed under ASTM D4894-19. Dispersion products are evaluated under ASTM D4895-18. The choice between suspension and dispersion grade depends on the downstream forming method. Suspension polymer is used for compression moulding and ram extrusion. Dispersion polymer is used for paste extrusion of thin-wall tubing and wire coatings. The two grades are not interchangeable in high-shear paste extrusion. Paste extrusion of dispersion PTFE requires a volatile hydrocarbon extrusion aid. The extrudate is dried below the flash point. The residual extrusion aid is removed in a sintering oven. The sintering step is carried out above 327 °C, the melting point of PTFE. The polymer is not injection mouldable. The melt viscosity is extremely high. Processing occurs through cold compression, paste extrusion, or ram extrusion. Published data for exact oxygen and inhibitor thresholds in tetrafluoroethylene storage and transport is limited to safety test reports and licensor packages.
At melt temperatures from 650 °C to 750 °C, magnesium oxidises rapidly in air. SF6 is delivered as a cover gas over the melt surface in hot chamber die casting stations. The carrier gas is dry air or nitrogen. The SF6 concentration is typically held between 0.5 vol% and 1.0 vol%. The gas decomposes at the melt surface and forms a mixed magnesium fluoride and magnesium oxide film. This film suppresses magnesium vapour burning and dross formation. At concentrations below 0.5 vol%, the film becomes patchy on large crucible diameters. The exposed melt surges create white oxide skimmings. Above 1.0 vol%, the protection does not improve proportionally. The extra gas contributes to workplace exposure and vessel corrosion. The decomposition products include hydrogen fluoride and sulphur oxyfluorides. Extraction hoods must be positioned to capture the boundary layer gas. Hoppers and transfer tubes require sealing to keep air out of the cover gas zone. Steel crucibles and thermowells corrode faster when the melt surface gas is not fully swept. The protective film is regenerated continuously. When the cover gas is interrupted, the film breaks within minutes. If the melt is not isolated, a magnesium fire can occur. Class D extinguishing media is therefore maintained near the casting deck.
The cover gas flow rate is set relative to melt surface area, not crucible volume. The exact value depends on cover geometry and extraction rate. Some sites use nitrogen-based mixtures to lower SF6 consumption. Alternative cover gases have been tested for magnesium melt protection. The move away from SF6 is driven by GWP concerns. Equipment suppliers can provide duct velocity calculations to capture decomposition products. Published data for this specific configuration is limited to site trials and equipment maker guidance.
Charging of HFO-1234yf into automotive air-conditioning lines follows the same metering discipline as HFC-134a but with a different flammability envelope. The refrigerant is classified as A2L under ASHRAE 34-2022. The designation means lower flammability and lower toxicological hazard. ISO 817:2014 establishes the refrigerant numbering system. The lower global warming potential of HFO-1234yf compared with HFC-134a has driven its adoption in mobile air conditioning. HFC-134a carries a 100-year GWP of 1430 under the AR4 basis used in EU phase-down rules. HFO-1234yf carries a 100-year GWP of 4. The trade-off is that HFO-1234yf is mildly flammable. Servicing therefore requires leak detection and ventilation controls. IEC 60335-2-40 defines maximum charge sizes for A2L systems used in buildings. Charge size is calculated from room floor area and appliance type. Exceeding the charge limit turns a contained system into a heavier regulatory obligation. Field recovery under EN 378-1:2016+A1:2020 requires trained personnel because the gas is pressurised.
R-32 and HFO blends are used in stationary air conditioning. R-32 is an A2L refrigerant with a 100-year GWP of 675. It is charged as a pure fluid in some split systems. R-410A is a near-azeotropic blend with a low temperature glide. Its use is being phased down in new equipment in the EU. The phase-down is expressed in CO2 equivalent tonnes under EU 2024/573. This quota system changes the commercial availability of high-GWP HFC blends. On a manufacturing floor, the blend ratio must be verified after charging because composition shifts during vapour leaks. For zeotropic blends, composition drift changes the dew point and bubble point. The system charge must be weighed as a liquid from the high-pressure side. Draw from the vapour phase can alter the composition of zeotropic blends. Refrigerant recovery cylinders are pressure-rated. They must not be filled beyond the liquid fill density specified in the cylinder standard. Moisture ingress during service reduces lubricant chemical stability. The acid number of the lubricant rises. That acid then attacks compressor windings. The service procedure therefore includes evacuation and filter-drier replacement.
Fluorinated gas propellants in pressurised metered-dose inhalers are not inert solvents. The two dominant propellants are HFA-134a and HFA-227ea. The canister is a sealed aluminium container. The valve is a metering chamber that isolates a fixed volume of liquefied propellant and drug suspension. The fill weight of the propellant is a critical process parameter. Too low a fill reduces pressure and delivered dose uniformity. Too high a fill increases the risk of canister distortion at elevated storage temperatures. Drug product container closures are controlled under 21 CFR 211.94 and compendial requirements for pressurised pharmaceutical preparations. Valve elastomers are selected to minimise extractables and leachables. The propellant must not exceed its specified moisture limit because water can hydrolyse the propellant or alter the suspension physical stability. The headspace pressure is determined by the vapour pressure of the propellant at the storage temperature. For a fixed metering valve, the emitted dose depends on the vapour pressure and the geometric volume of the metering chamber. This is why propellant fill weight and valve metering volume are validated together. A change in propellant supplier can shift the observed aerodynamic particle size distribution. The suspension may flocculate in the absence of a suitable surfactant. The canister must be primed before use to re-suspend the drug particles. These are handled as pharmaceutical manufacturing operations rather than industrial gas transfers.
The aerodynamic particle size distribution is assessed by USP 601 or Ph. Eur. 2.9.18. The canister is pressure-tested after filling. Temperature cycling tests are run on filled canisters to check valve leakage. The final package is leak tested before release. Published data on exact fill weight recipes is product-specific and confidential.
For low-frequency sound insulation in curtain wall assemblies, SF6-filled multi-pane glazing units use the gas for acoustic attenuation. The edge seal must maintain a much longer moisture path than air-filled units. The fill gas density and dielectric properties are secondary to the acoustic impedance mismatch. Published data for this specific configuration is limited.
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Fluorinated Gas is supplied as a family of compressed and liquefied gaseous products comprising carbon tetrafluoride (CF4), nitrogen trifluoride (NF3), sulfur hexafluoride (SF6), and, in defined semiconductor-grade variants, hexafluoroethane (C2F6) and octafluoropropane (C3F8). Model callouts follow a species-purity-cylinder convention such as electronic-grade CF4 5N in 47 L cylinders or electronic-grade NF3 4.6N in 44 L packages; these identifiers vary among suppliers and are interpreted through the certificate of analysis rather than the trade name. The product line is differentiated by gas species, purity grade, maximum water and oxygen limits, cylinder fill density, and analytical certification. These gases are handled in high-pressure cylinders, tube trailers, or ISO containers according to transport class ADR/RID Class 2 and national pressure-vessel codes, with cylinder design commonly referenced to ISO 9809-1. Use is divided among plasma etching, in-situ chamber cleaning, dielectric insulation, and magnesium melt protection. Selection differs from non-fluorinated electronic gases such as argon, helium, oxygen, and nitrogen because fluorinated gases generate fluoride ions or radicals under plasma or thermal activation, which increases etch or cleaning efficiency but imposes zero-moisture distribution, passivated 316L stainless steel, and perfluorinated emission abatement.
Within a semiconductor fabrication line, material compatibility and analytical confirmation precede installation. Gas cabinets for NF3 and CF4 use electropolished 316L stainless steel tube with 0.25-inch outside diameter and orbital welding; the gas panel is passivated and pressure-cycle purged before first flow. Certification limits are reported in parts per million by volume (ppmv) for water, parts per billion by weight (ppbw) for trace metals, and volume percent for bulk purity. The certificate of analysis is verified against the specification before cylinder acceptance. This product family excludes low-pressure refrigerant HFC blends; those are outside the semiconductor and electrical grades described here.
Across the product family, specification limits are controlled by gas species and final use. Electronic-grade CF4 and NF3 are supplied with low-oxygen and low-water limits, while electrical-grade SF6 is controlled for moisture, acidity, and condensable decomposition products under IEC 60376. NF3 electronic grade is commonly ordered against SEMI C3.10-0217; SF6 is ordered against IEC 60376. Certificate-of-analysis reporting relies on gas chromatography with pulsed discharge helium ionization detection for permanent gas purity, cavity ring-down spectroscopy for moisture per ASTM D7649-10, and inductively coupled plasma mass spectrometry for trace metals. Cylinder packages range from 0.75 L lecture bottles to 47 L electropolished stainless steel cylinders; service pressure varies by transport classification and fill density. The following matrix lists representative limits observed on commercial certificates of analysis; exact limits are supplier-specific and may be tighter for niche applications.
| Parameter | CF4 electronic grade | NF3 electronic grade | SF6 electrical grade |
|---|---|---|---|
| Bulk purity | 99.999 % by volume | 99.996 % by volume | 99.99 % by volume |
| Water | <1.0 ppmv | <1.0 ppmv | <15 ppmv per IEC 60376 |
| Oxygen | <1.0 ppmv | <3.0 ppmv | not routinely specified |
| Trace metals | <1.0 ppbw per element | <10 ppbw total | not routinely specified |
| Typical package | 47 L electropolished 316L cylinder | 44 L electropolished 316L cylinder | 50 L carbon steel or 316L cylinder |
Because cylinder preparation affects product cleanliness, some suppliers apply cylinder passivation and heated evacuation before filling. Batch-to-batch variation in water or metal content is controlled by this preparation, but a single contaminated cylinder can produce localized etch rate shift across multiple chamber lots. For this reason, incoming cylinder certificates are tied to the manufacturing execution system, and cylinders are rejected if a certificate parameter falls outside the upper specification limit.
For liquefied fluorinated gases such as SF6 and C3F8, cylinder fill density is limited by phase behaviour and the design pressure of the package. The filling ratio is selected so that the liquid phase does not completely fill the cylinder at the maximum transport temperature; overfilling can create hydrostatic pressure exceeding the cylinder test pressure. ISO 11114-1 is used to evaluate gas-cylinder material compatibility, while ISO 9809-1 covers seamless steel cylinder design. In practice, SF6 is commonly filled to a mass ratio of 1.0 kg/L or lower in a 50 L cylinder, and C3F8 packages are filled to lower ratios because of higher vapour pressure. These limits are transport-safety parameters, not process-performance parameters, but they influence cylinder changeout frequency and balance-of-plant sizing.
In a 300 mm etch tool gas panel, moisture at the low-ppmv level reacts with fluorinated plasma dissociates to form hydrogen fluoride, which corrodes downstream metal components and shifts silicon dioxide-to-silicon selectivity. Trace water also promotes particle formation on chamber walls and reduces etch rate stability run-to-run. Production-scale gas distribution lines are pressure-cycle purged with argon after cylinder changeout, and dead-leg volumes are kept below 15 cm downstream of mass flow controllers to minimize moisture retention. A moisture analyzer using cavity ring-down spectroscopy per ASTM D7649-10 is placed at the bulk gas source and at the point of use; electronic-grade CF4 and NF3 are typically specified at less than 1.0 ppmv water. When ambient relative humidity exceeds 60 %, cylinder changeouts are delayed or conducted under dry nitrogen purge because atmospheric water ingress into open gas lines is a measurable failure mode on manufacturing floors. Pre-conditioning cylinders at ambient temperature before operation prevents pressure-drop drift and transient moisture release.
Pressure-cycle purge protocols for electronic-grade fluorinated gas lines typically run 10 cycles between 0.1 barg and 2.0 barg with argon, followed by a hold at 2.0 barg and leak decay test. After purging, moisture is checked at the point of use. This protocol is used because simple flow-through purge does not remove water from low-velocity dead legs. On production lines, shortening the purge cycle after cylinder changeout has been associated with particle excursions and fluoride corrosion on chamber components.
When NF3 is substituted for CF4 in remote plasma cleaning of chemical vapour deposition chambers, the cleaning rate per unit flow commonly increases because NF3 dissociates more readily into fluorine radicals under radio-frequency or microwave plasma conditions. Process documentation from production tool evaluations reports NF3 utilization values of 85–95 % in optimized remote plasma sources, whereas older parallel-plate CF4 cleaning sequences may operate with utilization below 50 %. This higher utilization reduces unreacted perfluorinated gas load per cleaning event but does not eliminate emission control; the remaining NF3 and by-product gases are directed to a plasma abatement unit or thermal scrubber before exhaust release. Under Regulation (EU) No 517/2014, fluorinated greenhouse gases are subject to leak-check, recovery, and reporting obligations. The product difference between CF4 and NF3 is therefore not limited to cleaning chemistry; it changes abatement sizing, cylinder stock requirements, and emissions inventory. Published data for some chamber configurations remains limited because utilization depends on RF power, chamber wall temperature, pressure, and gas flow split.
Abatement sizing for NF3 is compound-specific: thermal abatement units operate at 1000–1400 °C, while plasma abatement modules treat exhaust at flow rates up to 2000 L/min. Water scrubbers alone are insufficient for perfluorinated species because CF4 and NF3 hydrolyse slowly; therefore catalytic or plasma stages are required. The choice of abatement technology changes exhaust backpressure, which must be accounted for in vacuum pump design.
| Species | Formula | Normal boiling point / sublimation point | Typical use | 100-year GWP (IPCC AR5) | Emission control |
|---|---|---|---|---|---|
| Carbon tetrafluoride | CF4 | -127.8 °C | Plasma etching | 6630 | Plasma/thermal abatement |
| Nitrogen trifluoride | NF3 | -129.1 °C | CVD chamber cleaning | 16100 | Plasma abatement, scrubber |
| Sulfur hexafluoride | SF6 | -63.8 °C sublimation | Electrical insulation | 23500 | Recovery per IEC 60480 |
Under arc conditions in gas-insulated switchgear, SF6 decomposes into lower fluorides, including sulfur tetrafluoride, thionyl fluoride, and hydrogen fluoride, when water or oxygen are present. These decomposition products are corrosive and toxic; therefore used SF6 is recovered rather than vented, with handling and reuse criteria defined in IEC 60480. Gas compartments are dried to low dew points before filling, and circuit breaker contact wear is monitored because accumulated metal fluoride powders can increase leakage current. For NF3 and CF4, thermal decomposition above the normal operating temperature of the gas cabinet presents similar hazards, generating HF and fluorine-containing radicals; gas cabinets are equipped with flow-restrictive devices, coaxial pigtails, exhaust ducting with velocity interlock at 1.0 m/s at the open access panel, and exterior toxic gas detectors. Incompatibilities include ammonia, hydrazine, organic amines, and finely divided reducing metals, which can initiate exothermic decomposition or produce unstable by-products. Operational boundaries for high-purity fluorinated gas handling include pre-use line purging, dew point verification below -40 °C, and exclusion of elastomers that absorb fluorinated gas or release volatiles.
In magnesium die casting and primary melting, SF6 cover gas is blended with air or carbon dioxide at 0.1–0.5 % by volume to form a protective film on the melt surface. The process window is narrow: below 0.1 % SF6 protection is incomplete and oxide inclusions increase; above 0.5 % SF6 the emission burden rises without proportional film improvement. Wet scrubbers and dry chemisorption can remove SF6 from crucible exhaust, but the gas's long atmospheric lifetime makes leak-tight supply and mass flow control critical. Published data for this specific configuration is limited because emission rates vary with melt surface area, agitation, and cover-gas balance.
Gas cabinet design for NF3 and CF4 service is governed by the requirement to isolate the cylinder valve from the process manifold and to remove purge gas without back-diffusion. A production-grade gas cabinet for electronic-grade NF3 typically uses a 0.25-inch coaxial pigtail, a pressure transducer upstream of the mass flow controller, and an automatic shutoff valve tied to toxic gas detection at 0.5 times the gas-specific permissible exposure limit. Cylinder scales provide telemetry for gas consumption, and tie-down brackets prevent movement during seismic events. The differences between this product family and non-fluorinated specialty gases are therefore operational as well as chemical: fluorinated gases require moisture-inert distribution components, toxic gas monitoring, abatement integration, and, in the case of SF6, gas recovery equipment that complies with IEC 60480. These requirements are specified on the cylinder label, safety data sheet, and certificate of analysis, not left to operator discretion.
