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Aluminum Gaskets for ConFlat (CF) UHV Flanges

Aluminum Gaskets for ConFlat (CF) UHV Flanges

Introduction

Aluminum Gaskets for ConFlat (CF) UHV Flanges are precision sealing components designed for metal-to-metal vacuum joints in high-vacuum (HV) and selected ultra-high-vacuum (UHV) systems. As an alternative to copper gaskets, aluminum gaskets are preferred in applications where lower sealing force, reduced flange wear, or material compatibility is required.

Detailed Description

Aluminum CF gaskets are manufactured with tightly controlled dimensions to match standard ConFlat knife-edge geometries. During assembly, the knife edges plastically deform the aluminum gasket, creating a clean, reliable metal seal without elastomers. Compared with copper, aluminum’s lower hardness allows sealing at reduced bolt torque, which can be beneficial for delicate assemblies or frequent cycling.

These gaskets are typically produced from high-purity aluminum to minimize outgassing and ensure consistent deformation behavior. They are single-use components, ensuring repeatable sealing performance and minimizing the risk of virtual leaks caused by work-hardening or surface memory.

Key features include:

  • Reliable metal-to-metal sealing for CF flanges

  • Lower required sealing force compared with copper

  • Reduced knife-edge wear on stainless steel flanges

  • Clean, elastomer-free construction for vacuum use

Applications

  • High-vacuum and selected UHV vacuum systems

  • Research chambers and analytical instruments

  • Semiconductor and thin film deposition equipment

  • Systems requiring frequent flange cycling

  • Applications where copper contamination must be avoided

Technical Parameters

ParameterTypical Value / RangeImportance
MaterialHigh-purity AluminumConsistent deformation, low outgassing
CF SizesDN16CF – DN250CF (custom available)Matches standard CF flanges
Sealing TypeKnife-edge metal sealElastomer-free vacuum integrity
Single UseYesEnsures repeatable sealing
Bakeout CapabilityLower than copper (application-dependent)Defines thermal limit
Typical Leak Rate≤ 1×10⁻¹⁰ mbar·L/sSuitable for HV/UHV use

Comparison with Copper CF Gaskets

Gasket MaterialKey AdvantageTypical Use
Aluminum CF GasketLower sealing force, less flange wearFrequent cycling, sensitive flanges
Copper CF GasketHigher bakeout temperatureStandard UHV systems
Silver-Plated CopperImproved reusabilitySpecialized UHV applications

FAQ

QuestionAnswer
Are aluminum CF gaskets reusable?No, like copper gaskets, they are designed for single use.
Can aluminum gaskets be used for UHV?Yes, for many UHV applications, within temperature limits.
Do they reduce damage to knife edges?Yes, aluminum is softer than copper and reduces flange wear.
Are custom sizes available?Yes, non-standard CF sizes can be supplied upon request.
How are they supplied?Cleaned and packed to prevent contamination.

Packaging

Our Aluminum Gaskets for ConFlat (CF) UHV Flanges are individually cleaned, counted, and packaged in sealed bags to maintain surface cleanliness. Bulk and small-quantity packaging options are available to support laboratory and production needs.

Conclusion

Aluminum Gaskets for ConFlat (CF) UHV Flanges provide a reliable, low-force sealing solution for metal vacuum joints where reduced flange wear and clean performance are priorities. With precise machining, consistent quality, and full compatibility with CF standards, they are a practical alternative to copper gaskets in many HV and UHV systems.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

Ordering Table

Drawing Flange OD Gasket ID Gasket OD Part Number
Tooltip DN16CF (1.33" OD) 0.640 0.837 GA-0133AL
Tooltip DN25CF (2.125" OD) 1.010 1.291 GA-0212AL
Tooltip DN35CF-DN40CF (2.75" OD) 1.450 1.895 GA-0275AL
Tooltip DN50CF (3.375" OD) 2.010 2.425 GA-0337AL
Tooltip DN63CF (4.50" OD) 2.506 3.241 GA-0450AL
Tooltip DN100CF (6.00" OD) 4.006 4.743 GA-0600AL
Tooltip DN125CF (6.75" OD) 5.010 5.567 GA-0675AL
Tooltip DN160CF (8.00" OD) 6.007 6.743 GA-0800AL
Tooltip DN200CF (10.00" OD) 8.007 8.743 GA-1000AL
Tooltip DN250CF (12.00" OD) 10.007 10.743 GA-1200AL

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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