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T: 400-6130-885
E: cservice@xx.com
E: cservice@xx.com
5th floor, Financial Innovation Plaza, 8-2 Pusi Road, Jiangbei New District, Nanjing
Friendly link (QQ: 3004257586)
Friendly link (QQ: 3004257586)
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Product Description
The soundproof micro hole noise barrier employs micro-perforated panel acoustic technology to achieve broadband noise absorption through Helmholtz resonance. Each panel surface contains precision-drilled micro-perforations typically ranging from 0.8 mm to 1.2 mm in diameter, with perforation rates between 3 percent and 8 percent. Sound waves entering these tiny apertures excite air column vibration within the cavity behind the panel, dissipating acoustic energy through viscous friction and heat conversion at the perforation boundaries.
Each highway micro hole barrier panel features a three-layer composite construction. The front face consists of a micro-perforated galvanized steel or aluminum alloy sheet facing the noise source. Behind the perforated panel sits a 50 mm to 100 mm deep air cavity filled with high-density centrifugal glass wool or rock wool as supplementary sound-absorbing media. The rear solid metal panel provides sound insulation through mass law effect, reflecting unabsorbed sound energy back into the absorption cavity for additional dissipation cycles.
Product Advantages
Micro-perforated acoustic panels deliver measurable noise reduction across the traffic noise frequency spectrum. Field measurements on installed highway barriers show insertion loss values ranging from 20 dB to 30 dB at frequencies between 250 Hz and 4000 Hz, with peak absorption occurring in the 1000 Hz to 2000 Hz band where tire-road noise concentrates. Normalized noise reduction coefficient (NRC) values reach 0.70 to 0.85 per ASTM C423 testing procedures.
The micro hole configuration offers functional advantages over traditional louvered or slotted barrier designs. Small aperture diameters prevent rainwater ingress and dust accumulation within internal acoustic infill, maintaining consistent acoustic performance over the service life without periodic infill replacement. The smooth perforated surface also sheds water rapidly, eliminating standing water that could degrade panel materials over time.
Despite acoustic performance comparable to heavier solid barrier designs, the micro-perforated panel maintains a lightweight profile with total panel thickness of 80 mm to 100 mm. This reduced weight lowers structural loading on support posts and foundations, enabling longer span distances between posts and reducing material quantities for both the barrier system and supporting civil works.
Technical Parameters
Product Name | Sound Barrier Fence / Acoustic Fence / Soundproof Wall / Noise Reduction Wall |
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Metal Panel Material | Galvanized sheet, aluminum alloy sheet, color plate |
Metal Panel Thickness | 0.8mm / 1.0mm / 1.2mm / 1.5mm |
Post Size | 100×100 / 125×125 / 150×150 / 175×175 |
Transparent Panel Material | PC sheet, Acrylic sheet, Laminated tempered glass |
Color | Green 6029, blue 5017, gray 7042, white 9010, etc. Color can be selected according to the national standard color card |
Surface treatment | Hot dip galvanizing-electrostatic powder coating, fluorocarbon spraying |
Application Scenario
Micro hole noise barriers are installed along highway alignments, elevated expressways, and urban viaducts where traffic noise impacts adjacent residential and commercial zones. The flat perforated surface provides uniform visual appearance along curved roadway alignments, making the system suitable for urban infrastructure projects where aesthetic considerations factor into municipal approval processes.
Beyond highway applications, the micro-perforated barrier system serves urban light rail transit corridors, subway elevated sections, and industrial facility perimeters. The dust-resistant perforation design is particularly suited to industrial environments where airborne particulate levels are elevated, ensuring acoustic performance remains stable without periodic cleaning or infill maintenance.
Customized Service
Service Item | Detailed Description |
|---|---|
Sample | Free product small samples |
MOQ | No fixed MOQ, order on demand |
Lead Time | 10-15 working days for standard products |
Export Packing | Customized packing: pearl foam padding + bubble wrap/carton for bundles; plywood case for special sizes |
Technical Support | Free design, drawings & installation videos |
Standard micro-perforation diameters include 0.8 mm, 1.0 mm, and 1.2 mm, with perforation rates adjustable from 3 percent to 8 percent based on project acoustic requirements. Custom aperture specifications can be produced from customer-supplied drawings.
The small perforation diameter prevents direct rainwater entry into the internal cavity. Combined with drainage channels at panel base rails, the system maintains dry internal conditions and preserves acoustic infill performance in areas with annual rainfall exceeding 1000 mm.
Yes, the micro-perforated panel can be roll-formed into arc-shaped, top-curved, and knuckling profiles to match project aesthetic requirements and acoustic diffraction control needs at barrier tops.
For coastal projects with salt spray exposure, fluorocarbon spraying with 40 μm to 60 μm coating thickness is recommended over standard polyester powder coating, providing enhanced resistance to chloride-induced corrosion.
