Sub-millimetre holes, engineered geometry and controlled air cavities — acoustic absorption tuned by physics, not by fibre.
Micro-Perforated Panels are metallic sound absorbers containing precisely engineered micro-holes (sub-millimetre perforations), backed by controlled air cavities or honeycomb cores. The principle traces to Ma Dayou’s theory of micro-perforated absorbers.
Sound energy is dissipated through:
The result is stable, broadband absorption with no fibre, foam or binder — our own geometry places roughly 300,000 sub-millimetre holes per square metre.
MPP systems work on Helmholtz resonance and transfer impedance theory, letting designers target specific frequencies by controlling three variables.
Sub-millimetre perforations — e.g. 0.25 × 0.040 mm — set the viscous resistance that converts sound to heat.
A controlled open area of around 0.33% balances resistance and reactance for broadband absorption.
Backing depths of 50 mm or 100 mm shift the resonance to target low- or mid-frequency noise.
| Parameter | Fibrous Materials | Micro Acoustics MPP |
|---|---|---|
| Acoustic stability | Degrades over time | Permanent |
| Dust / fibre shedding | Yes | Nil |
| Moisture absorption | High | Negligible |
| Fire load | High | Low (non-combustible) |
| Hygiene | Poor | Excellent & washable |
| Maintenance | Frequent | Minimal |
Micro-hole acoustic panels match or exceed porous absorbers while remaining fibre-free and durable.
| Material Category | Representative Materials | NRC Range |
|---|---|---|
| Porous absorbers | Mineral wool, rock-wool sponge, mineral-wool linen fabric, cotton | 0.4–0.9 |
| Perforated panels | Perforated gypsum, plywood, aluminium & steel | 0.5–0.7 |
| Solid panels | Plywood, gypsum, plastic, steel | 0.2–0.4 |
| Micro-Hole Acoustic Panel | Micro Acoustics MPP system | 0.7–0.9 |
Review our ARAI NABL-accredited absorption and transmission-loss reports, or talk to our engineers about tuning a panel to your frequency profile.