1. ISO-K (Clamped Flanges)

• Fast assembly using clamps.
• Ideal for applications requiring modularity and quick maintenance.

Connection Method:

• Uses claw clamps or hinged clamps to secure the flanges.
• O-ring and centering ring create the vacuum seal.

2. ISO-F (Fixed Flanges)

• Bolted connections for permanent or rigid setups.
• Offers superior stability under high stress or vibration.

Connection Method:

• Flanges are bolted together using through bolts.
• Same O-ring and centering ring setup as ISO-K flanges.

ISO Flange Components

1. Flanges

• Made of stainless steel (304/316L) or aluminum.
• Available in both ISO-K (clamped) and ISO-F (bolted) designs.

2. O-Ring

• Provides a vacuum seal between mating flanges.
• Common materials include:
  • Viton: High temperature and chemical resistance.
  • Nitrile (NBR): Cost-effective for general use.

3. Centering Ring

• Ensures proper alignment and positioning of the O-ring.
• Types:
  • Standard Centering Ring.
  • Screened Centering Ring (includes a mesh for particulate control).

4. Clamps (ISO-K)

• Claw Clamps: Attach to the beveled edges of ISO-K flanges.
• Hinged Clamps: Allow for quick and easy assembly without tools.

5. Bolts and Nuts (ISO-F)

• Bolts secure ISO-F flanges for rigid connections.
• Vented bolts are available to minimize trapped gas (virtual leaks).

Applications of ISO Flanges

• High Vacuum Systems: Applications requiring vacuums down to 10⁻⁸ mbar.
• Vacuum Coating Systems: Used in large deposition chambers for thin film coatings.
• Semiconductor Processing: Integrated into vacuum systems for etching, deposition, or testing.
• Vacuum Furnaces: Used for heat treatment and material processing.
• Large Vacuum Chambers: For research or industrial-scale applications.
• Cryogenic Systems: Systems requiring large-diameter vacuum connections for cooling processes.