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Functional Filtration

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what is in-ex?

IN-EX is a clean sono-chemical impregnation platform that upgrades standard filter media into functional media.

Using acoustic cavitation in a water-based process, functional particles are embedded directly into the fiber matrix — without binders, glues, or pore-blocking surface coatings.

The result is a versatile technology that gives filter media new properties while preserving permeability, airflow, and liquid-flow performance. It enables advanced functional filters without the energy penalties and environmental compromises common in traditional treatment methods.

The industry challenge
  • Coatings and binders
can block pores
  • Higher differential pressure
means higher energy demand
  • Surface treatments can
degrade, wash off, or flake
  • PFAS, recycling, and chemistry
restrictions are growing
Functional Filtration
A sono-chemical impregnation platform for next-generation filter media.
  • PFAS & VOC-Free Process
  • Binder-Free
  • Low ΔP Impact
The in-ex Solution
Sono-chemical Impregnation
Particles are driven onto and into the fiber surface by acoustic cavitation, without a binder layer.
  • Open
    Porosity
  • Unrestricted
    flow
  • Lower ΔP
    Lower energy
  • Untreated Fiber Close-up
  • IN-EX Treated Fiber Close-up
  • IN-EX Treated Media
How in-ex works
A water-based ultrasonic process that embeds functional particles into the fiber matrix.
  • 1
    Selected functional
particles are dispersed
in water
  • 2
    Ultrasonic cavitation
creates high-energy
micro-jets
  • 3
    Micro-jets drive the
particles into the
fiber matrix
  • 4
    The media is functionalized while its fundamental properties (flow and porosity) are preserved
Key process benefits
  • Water
    based
  • Binder
    free
  • Strong
    particle retention
  • Low ΔP
    impact
  • Continuous
    roll-to-roll ready
The in-ex DIFFERENCE
  • COMPARISON AREA
    CONVENTIONAL METHODS
    in-ex platform
  • How function
    is added
    Surface coating / glue / binder
    Particles embedded
in
    fiber matrix
  • Pore structure
    Can block
pores
    Open porosity
preserved
  • Differential
pressure
    Higher ΔP, higher
energy demand
    Low ΔP
impact
  • Durability
    May degrade, wash off, or flake
    Strong particle
retention
  • Environmental
profile
    More chemistry
burden
    PFAS & VOC-Free, water-based process
  • Design
flexibility
    Limited treatment
options
    One platform, many functional particle systems
is a platform —

not a single feature.
Real functional particles
Examples of particle systems that can add extra performance to filter media.
  • Silver / copper /
zinc compounds
    Antimicrobial activity and biofilm control
  • Titanium dioxide
    (TiO₂)
    Photocatalytic support and odor reduction under suitable light conditions
  • Aluminum and Iron Metallo-Organic Compounds
    Enhanced pathogen attraction while maintaining low ΔP impact
  • Hydrophobic
mineral particles
    Water repellency and
liquid-separation support
The selected chemistry depends on the media, application, regulations, and target performance.
Use cases across filtration
One platform for air and liquid media
Air filtration
  • Cabin
    air filters
    Antimicrobial functionality and odor control
  • HVAC / IAQ
    filters
    Cleaner indoor air and reduced microbial buildup on media
  • Portable AC &
    appliance filters
    Compact hygienic
media solutions
  • Industrial
    dust collection
    Anti-static and specialty
functional media
Liquid filtration
  • Fuel & hydraulic
    filters
    Water-separation support and functional media enhancement
  • Water / process
    filtration
    Anti-fouling or active functional surfaces
Tailored particle-media combinations for the need of each application
Current in-ex product examples
Existing applications based on the technology
  • Antiviral Cabin Filters
    • For passenger cars and commercial vehicles
    • Functional media with low ΔP impact
  • HVAC Filters
    • For commercial and institutional air systems
    • Cleaner indoor air applications
  • PORTABLE A/C & PURIFIER FILTERS
    • Treated media for portable cooling units
    • Hygienic filtration performance
Further tailored product concepts can be developed for additional filter types and media formats.
FAQ
  • Is IN-EX a coating?
    No. IN-EX is not a conventional surface coating. It is an impregnation process that embeds functional particles into the filter media structure, helping maintain airflow while adding functional performance to the media.
  • What is the main advantage of IN-EX compared with traditional treated media?
    Traditional treatments often sit on the surface of the media and may affect airflow or pressure drop. IN-EX is designed to integrate the active particles into the fiber matrix, creating a more stable and efficient functional media structure.
  • Does IN-EX change the filter’s airflow performance?
    IN-EX is designed to preserve the original airflow characteristics of the media as much as possible. The final performance depends on the media type, filter construction and treatment level, and is validated through testing.
  • Can IN-EX be applied to different types of media?
    Yes. IN-EX can be adapted to different filtration media, depending on the application, target performance and technical requirements.
  • Is IN-EX suitable only for automotive cabin filters?
    No. Automotive cabin filtration is one important application, but IN-EX can also be relevant for HVAC, indoor air quality, portable air systems and selected industrial filtration applications.
  • What kind of functional performance can IN-EX add?
    Depending on the active material used, IN-EX can support different functional properties, including antimicrobial protection, odor reduction, enhanced air quality performance or other application-specific benefits.
  • Does IN-EX release particles into the air?
    IN-EX is designed to embed the functional particles into the media rather than leave them loosely on the surface. The goal is to create a stable treated media that performs without releasing active particles into the airflow.
  • Is IN-EX safe for use in air filtration?
    IN-EX is developed using controlled materials and processes. Final safety and compliance depend on the specific application, active material, market and regulatory requirements.
  • Does IN-EX use solvents or PFAS?
    IN-EX is a water-based process and is developed without PFAS-based coatings, binders or glues.
  • Can IN-EX be used with existing filter designs?
    In many cases, yes. IN-EX can be applied to selected media before filter production, allowing functional media to be integrated into existing or newly developed filter designs.
  • Is IN-EX available for private-label products?
    Yes. IN-EX can be integrated into private-label filtration programs, allowing A.L. GROUP partners to offer advanced functional filters under their own brand.
  • How is IN-EX validated?
    Validation depends on the target application and may include airflow, pressure drop, filtration efficiency, microbial performance, durability and material stability testing.
  • Can IN-EX help differentiate a filter range?
    Yes. IN-EX allows partners to upgrade standard filtration products into value-added solutions, helping create stronger product differentiation in competitive markets.
  • Is IN-EX a replacement for HEPA filtration?
    No. IN-EX is not simply a HEPA replacement. It is a functional media treatment platform that can be combined with different filtration grades depending on the required performance.
  • Can A.L. GROUP develop a specific IN-EX solution for our market?
    Yes. A.L. GROUP can work with partners to evaluate the application, media type, performance target and regulatory needs in order to develop a suitable IN-EX-based solution.
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