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Choosing the Right Air Spring: FAEBI® vs. BiAir®

Published September 23, 2026
Choosing the Right Air Spring: FAEBI® vs. BiAir®

Air spring isolators provide an effective alternative to traditional steel springs for reducing vibration, shock and structure-borne noise.

Bilz offers two main solutions: FAEBI® Rubber Air Springs and BiAir® Low Frequency Membrane Air Springs.

FAEBI® Rubber Air Springs

FAEBI® air springs use a reinforced elastomer design that combines vibration isolation with high mechanical stability.

Key Benefits

  • Integrated damping
  • Adjustable air pressure for changing loads
  • Reduced transmission of structure-borne noise
  • Anti-slip base pads
  • Optional mechanical level control

Typical Applications

FAEBI® air springs are suitable for:

  • High-speed presses
  • Forging hammers
  • Machines with dynamic forces
  • Measuring and testing equipment
  • Precision machine tools

BiAir® Low Frequency Membrane Air Springs

BiAir® isolators use a flexible rolling membrane and a two-chamber air system with adjustable damping.

They are designed for applications requiring very effective low-frequency vibration isolation.

Key Benefits

  • Automatic level control
  • Adjustable damping
  • Consistent isolation under changing loads
  • Reduced structure-borne noise
  • Protection against excessive pressure or piston travel

Typical Applications

BiAir® systems are suitable for:

  • Precision measuring equipment
  • Testing systems
  • Laser equipment
  • Optical and electronic instruments
  • Precision finishing machines
  • Engine and gearbox test stands
  • Machine foundations

FAEBI® or BiAir®?

The correct choice depends on the machine, vibration frequency, load conditions and required isolation performance.

FAEBI® is well suited for dynamic machinery and general vibration isolation, while BiAir® is ideal for highly sensitive applications requiring low-frequency isolation and automatic level control.

Bilz can help determine the most suitable air spring solution for your equipment and operating environment.

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