3003 H18 Aluminum foil for hepa air filter

3003 H18 aluminum foil is the standard material choice for the metal separator, a core component of HEPA/ULPA filters. It perfectly balances high strength (H18 state), good corrosion resistance (3003 alloy), excellent formability, and economy, providing a robust "skeleton" for the fragile filter paper at the microscale, thereby ensuring the high efficiency, stability, and long service life of the entire filter.

Main Uses in HEPA Filters

In typical plate and frame or pleated HEPA filters, 3003 H18 aluminum foil plays two main roles:

Separator/Pleat Support: This is the primary use. The aluminum foil is pressed into a tight corrugated shape and inserted between the pleats of each layer of filter paper. Its function is to:

Maintain airflow passage: Prevent the filter paper from collapsing under air pressure, ensuring that air can pass evenly across the entire filtration area.

Enhance structural strength: Provide a robust skeleton for the entire filter element, enabling it to withstand the mechanical stresses during installation and operation.

Optimize pleat uniformity: Ensure consistent pleat height and pleat spacing, which is crucial for filtration efficiency and pressure drop.

Frame or Reinforcing Rib: In some filter designs, thicker 3003 aluminum sheets may be used to construct the filter frame or as reinforcement at the edges of the filter element.