Washable Sound-Absorbing Walls: Combining Hygiene and Acoustic Performance
10/31/2025
Introduction
With the implementation of HACCP, manufacturing environments in the food and pharmaceutical sectors are now expected to maintain both hygiene and comfort.
Noise from packaging machines, conveyors, and vacuum pumps often reduces concentration and affects product quality.
Traditional sound absorbers, such as glass wool or foam, cannot be used in these environments because of particle emission and poor cleanability.
This has led to growing interest in washable sound-absorbing wall systems, which provide effective acoustic control while maintaining hygienic standards.
Why Hygienic Environments Require Washable Acoustic Walls
In hygiene-controlled facilities, cleanability and safety are essential.
Sound absorbers must be resistant to contamination and suitable for frequent cleaning.
Conventional materials pose several risks:
- Fiber or dust shedding leading to contamination
- Water absorption and microbial growth
- Rough surfaces that trap dirt or oil
To meet hygienic standards, modern absorbers must be non-fibrous, water-resistant, and chemically stable.
Performance Requirements for Hygienic Acoustic Materials
Acoustic materials used in HACCP or GMP environments must meet the following performance criteria:
| Requirement | Description |
|---|---|
| Non-fibrous | No emission of fibers or particles |
| Water-resistant | Non-absorbent, quick-drying after cleaning |
| Washable | Smooth surface suitable for alcohol or detergent cleaning |
| Fire-resistant | Non-combustible or semi-non-combustible |
| Chemically stable | Resistant to oils, detergents, and sanitizing agents |
| Long-term durability | Minimal discoloration and degradation |
Broadband Fractal Board (BFB) is an example of a non-fibrous, broadband absorber designed for hygienic use.
It offers consistent sound absorption while maintaining compatibility with cleanroom-grade cleaning requirements.
Structure and Function of a Washable Acoustic Wall
A washable acoustic wall integrates three main components:
| Front panel | Hard, smooth, waterproof surface |
| Core layer | Non-fibrous broadband absorber (e.g., BFB) |
| Rear plate | Aluminum or coated steel backing |
| Sealing | Airtight joints to prevent dust ingress |
This configuration enables the wall to absorb sound internally while presenting a smooth, cleanable outer surface.
It provides acoustic comfort without compromising sanitation.
Design, Installation, and Maintenance Guidelines
Design considerations
- Position absorbers on reflective surfaces such as walls and ceilings.
- Maintain laminar airflow and ventilation performance.
- Use modular panels for easy access and cleaning.
Installation
- Employ short-duration retrofit methods that minimize downtime.
- Use hanging or detachable panel systems for periodic maintenance.
Maintenance
- Clean with alcohol or neutral detergent as part of routine cleaning.
- Inspect joints annually for sealing integrity.
- Expect stable acoustic performance over long service periods.
Conclusion: Hygiene and Quietness as Dual Quality Standards
In modern manufacturing environments, cleanliness and acoustic comfort are equally important.
Washable sound-absorbing walls combine hygiene, durability, and sound absorption, supporting both worker comfort and product quality within HACCP and GMP standards.
They represent the next step in integrated environmental control, where hygiene and silence coexist as part of a single quality framework.