Introduction
OFHC Copper Gaskets are a critical sealing element in ConFlat® (CF) flange systems, enabling reliable metal-to-metal seals required for ultra-high vacuum (UHV) applications. Made from oxygen-free high-conductivity (OFHC) copper, these gaskets are engineered to deliver exceptionally low outgassing rates, consistent deformation, and long-term vacuum integrity. They are widely trusted in research laboratories, semiconductor manufacturing, and advanced vacuum equipment worldwide.
Detailed Description
Our OFHC Copper Gaskets for CF UHV flanges are manufactured from high-purity oxygen-free copper, typically 99.99% (4N) or higher, ensuring excellent ductility and cleanliness. During installation, the knife edges of the CF flange plastically deform the copper gasket, creating a tight, permanent seal without the need for elastomers or adhesives.
The absence of oxygen and other impurities significantly reduces outgassing and minimizes the risk of virtual leaks, making OFHC copper the industry standard for UHV sealing down to 10⁻¹⁰ mbar and below. These gaskets exhibit uniform grain structure and controlled hardness, allowing consistent sealing performance across repeated thermal cycles and high-temperature bake-outs.
Available in all standard CF sizes (DN16CF to DN250CF and larger), the gaskets are precisely dimensioned to match flange standards, ensuring proper compression and repeatable results. Optional surface treatments, such as annealing or cleaning for UHV use, can be provided to meet stricter application requirements.
Applications
OFHC Copper CF gaskets are commonly used in:
Ultra-high vacuum (UHV) and high vacuum (HV) systems
Semiconductor processing and wafer fabrication tools
Thin-film deposition systems (PVD, CVD, sputtering)
Particle accelerators, beamlines, and synchrotron facilities
Surface science, analytical instruments, and R&D laboratories
They are ideal wherever leak-tight, bakeable, and contamination-free vacuum seals are required.
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Material | OFHC Copper (≥99.99%) | Ensures low outgassing and high ductility |
| Flange Compatibility | ConFlat® (CF) | Industry-standard UHV sealing system |
| Size Range | DN16CF – DN250CF (custom available) | Fits standard CF flange dimensions |
| Seal Type | Knife-edge metal seal | Enables leak-tight UHV performance |
| Hardness | Annealed or standard | Controls deformation and sealing reliability |
| Bake-out Temperature | Up to ~450 °C | Suitable for UHV system conditioning |
Comparison with Related Materials
| Material | Key Advantage | Typical Application |
|---|---|---|
| OFHC Copper Gasket | Lowest outgassing, best UHV seal | UHV and semiconductor systems |
| Nickel Gasket | Higher temperature capability | Extreme thermal environments |
| Aluminum Gasket | Lightweight, softer | Non-UHV or special vacuum setups |
FAQ
| Question | Answer |
|---|---|
| Are these gaskets reusable? | CF copper gaskets are generally single-use to ensure reliable sealing. |
| Do you offer UHV-cleaned gaskets? | Yes, vacuum-cleaned and UHV-grade packaging are available on request. |
| Are custom sizes available? | Yes, custom dimensions and thicknesses can be manufactured. |
| Which CF sizes are most common? | DN16CF, DN40CF, DN63CF, and DN100CF are widely used in UHV systems. |
Packaging
Our OFHC Copper Gaskets are individually packed and clearly labeled to ensure easy identification and strict quality control. Clean handling and protective packaging are used to prevent surface contamination or deformation during storage and transportation.
Conclusion
OFHC Copper Gaskets for ConFlat (CF) UHV Flanges provide a proven, industry-standard sealing solution for demanding vacuum environments. With high purity, excellent ductility, and consistent performance, they are essential components for achieving and maintaining ultra-high vacuum conditions.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Drawing | Flange OD | Gasket ID | Part Number |
| DN16CF (1.33" OD) | 0.640 | GA-0133 |
| DN16CF (1.33" OD) | Blank | GA-0133S |
| DN25CF (2.125" OD) | 1.010 | GA-0212 |
| DN25CF (2.125" OD) | Blank | GA-0212S |
| DN35CF-DN40CF (2.75" OD) | 1.450 | GA-0275 |
| DN35CF-DN40CF (2.75" OD) | 1.528 | GA-0275LB |
| DN35CF-DN40CF (2.75" OD) | Blank | GA-0275S |
| DN50CF (3.375" OD) | 2.010 | GA-0337 |
| DN50CF (3.375" OD) | Blank | GA-0337S |
| DN63CF (4.50" OD) | 2.506 | GA-0450 |
| DN63CF (4.50" OD) | 2.800 | GA-0450LB |
| DN63CF (4.50" OD) | Blank | GA-0450S |
| DN75CF (4.625" OD) | 3.010 | GA-0462 |
| DN75CF (4.625" OD) | Blank | GA-0462S |
| DN100CF (6.00" OD) | 4.006 | GA-0600 |
| DN100CF (6.00" OD) | Blank | GA-0600S |
| DN125CF (6.75" OD) | 5.010 | GA-0675 |
| DN125CF (6.75" OD) | Blank | GA-0675S |
| DN160CF (8.00" OD) | 6.007 | GA-0800 |
| DN160CF (8.00" OD) | Blank | GA-0800S |
| DN200CF (10.00" OD) | 8.007 | GA-1000 |
| DN250CF (12.00" OD) | 10.007 | GA-1200 |
| DN250CF (12.00" OD) | Blank | GA-1200S |
| DN275CF (13.25" OD) | 10.792 | GA-1325 |
| DN295CF (14.00" OD) | 11.811 | GA-1400 |
| DN305CF (14.50" OD) | 12.104 | GA-1450 |
| DN350CF (16.50" OD) | 14.037 | GA-1650 |
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