In environments such as subway tunnels, packed multi-purpose halls, or generator rooms, hard, reflective surfaces cause reverberation times to extend—making broadcasts difficult to hear and allowing machinery noise to travel hundreds of meters. Perforated sound-absorbing panels address this issue directly at the surface: instead of bouncing sound back into the room, the panel surface absorbs reflected sound energy through resonance and converts it into heat. In addition to metal, we offer custom perforated panels for interior projects using substrates such as wood, gypsum, calcium silicate, and magnesium oxide (MGO) board.
Perforated acoustic panels operate based on the Helmholtz resonance principle. As sound waves enter the small perforations, the air inside the holes vibrates, dissipating a portion of the sound energy. When an air cavity is left behind the panel—optionally filled with glass wool or rock wool—sound waves passing through undergo secondary absorption upon reflection.
1.Hole diameter: 2.5–10 mm (0.5–3 mm for micro-perforated designs)
2. Perforation rate: Adjustable from 2.3% to 30%; the 10%–30% range is optimal
3.Panel thickness: 0.4–20 mm, depending on the substrate
4.Cavity depth behind the panel: 30–150 mm; deeper cavities improve low-frequency absorption
With the right combination of parameters, the Noise Reduction Coefficient (NRC) can reach 0.60–0.90; for micro-perforated versions, acoustic testing shows an NRC of 0.70–0.85.
Indoor panels meet the GB 18580 formaldehyde emission limits, making them suitable for schools, hospitals, and office buildings.
Choose from over 100 custom colors and finishes (powder coating or fluorocarbon coating with film thicknesses up to 75 μm), as well as various perforation patterns—round, square, slotted, or cross-shaped holes. The panels complement architectural designs rather than clashing with them.
Options include furring channel mounting, direct adhesion, or suspension systems. Individual perforated sound-absorbing panels can be removed and replaced separately, ensuring that maintenance doesn't turn into a full-scale renovation.
| Item | Specification |
|---|---|
| Metal Substrate | Color steel coil, aluminum coil, galvanized steel sheet, stainless steel |
| Other Custom Substrates | MDF / plywood, gypsum board, calcium silicate board, magnesium oxide board |
| Common Sizes | 600×600 mm, 600×1200 mm, 1200×2400 mm; full-size customization available |
| Board Thickness | 0.4–20 mm |
| Hole Diameter | 2.5–10 mm (micro-perforation: 0.5–3 mm) |
| Perforation Rate | 2.3%–30% (recommended 10–30%) |
| Hole Pattern | Round hole, square hole, oblong hole, cross hole, slotted hole |
| Cavity Depth | 30–150 mm (recommended 50–100 mm) |
| NRC | 0.60–0.90 (high-grade version ≥0.75) |
| Fire Rating | Class A non-combustible (metal / gypsum / calcium silicate / magnesium oxide); Class B1 (treated wood-based) |
| Environmental Grade | E1 (GB 18580) |
| Lead Time | 3–7 days for standard items, 7–15 days for custom orders |
For venues dominated by human speech—such as lecture halls and gymnasiums—the focus is on absorbing the 500–4000 Hz range; small perforations (1–3 mm) work best here. Theaters and concert halls requiring low-frequency control should use larger perforations (8–10 mm) combined with a 100–150 mm deep air cavity. In most applications, matching the perforation size to the dominant noise frequency is more effective than simply increasing the total panel surface area.
Perforated metal sound-absorbing panels are widely used in tunnels, subway stations, swimming pools, and exterior facades, where moisture would ruin wood or gypsum-based panels. For decorative interiors—such as auditoriums, conference rooms, and hotel lobbies—wood-grain finished panels offer the best visual appeal. Calcium silicate and magnesium oxide (MGO) substrates are ideal for mechanical rooms, pump rooms, and humid industrial facilities.
A single-layer perforated sound-absorbing panels with an air cavity is sufficient to handle typical mid-to-high frequency noise. Filling the cavity with 50 mm of glass wool or rock wool significantly improves low-frequency absorption—a step we find is most frequently overlooked during on-site installation. Aluminum honeycomb cores compartmentalize airflow, enabling sound absorption coefficients exceeding 0.9 in large public buildings.
Shengbo operates 5 major production bases, 110 production lines, and over 100 forming machines, with a daily capacity exceeding 100,000 m². Our perforated sound-absorbing panel facility is equipped with high-speed, precision, fully automated punching lines designed for various coil materials. Located adjacent to Tianjin Port, the factory offers convenient container loading and shipping booking, facilitating the export of orders.
1. Incoming raw material inspection: Color, thickness, width, and coil weight.
2. In-process inspection: Hole diameter, hole pattern/layout, panel dimensions, scratches, overlapping fit, and panel profile.
3. Pre-shipment inspection: Packaging, stacking, and transport safety (an 8-step SOP packaging process significantly reduces transit damage).
Products come with a 15-year warranty; pre-sales technical support is provided by engineers with over 10 years of experience in metal envelope systems.
We are a manufacturer with our own perforated acoustic panel production base in Tianjin. You are welcome to visit the factory for an inspection, or we can send you videos of your order being processed on the production line.
Yes. We produce orders with hole diameters of 0.5–10 mm, perforation rates of 2.3–30%, various shapes (round, square, slotted, staggered), and over 100 color options. OEM services and customization based on project drawings are part of our standard workflow.
No. The panels themselves are merely perforated sheets; to achieve optimal noise reduction, they must be combined with acoustic insulation and a backing board to form a complete acoustic system. Installing the panel alone significantly reduces acoustic performance, but we can provide a comprehensive acoustic solution.
Standard panels ship in 3–7 days; customized perforation or finishes take 7–15 days, depending on order volume.
The aforementioned three-tier inspection process applies to every order. Before packaging, hole geometry and dimensions are verified against approved drawings, ensuring that panels from different batches fit the same framing/grid layout.
The panels are standard steel-structure components, so a standard steel construction team can handle the installation; we can provide installation guidelines, so there is no need to hire a specialized acoustic contractor.
Address
No. 17 Guanghai Road, Jinghai Economic Development Zone, Tianjin, China
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