The specialized composite polyurethane foam electromagnetic wave absorber for EMC anechoic chambers is a high-performance absorbing material designed specifically for electromagnetic compatibility (EMC) testing environments. Utilizing a polyurethane foam matrix, it achieves efficient absorption and low reflection of broadband electromagnetic waves through the incorporation of various functional absorbing agents—such as carbon-based materials, ferrites, and nanomaterials—and the optimization of its structural geometry (typically featuring wedge, cone, or combined flat-and-wedge configurations).
Industry Expertise
Global Reach
OEM/ODM Services
The specialized composite polyurethane foam electromagnetic wave absorber for EMC anechoic chambers is a high-performance absorbing material specifically engineered for Electromagnetic Compatibility (EMC) testing environments. Utilizing a polyurethane foam matrix, it achieves efficient absorption and low reflection of broadband electromagnetic waves through the incorporation of various functional absorbing agents (such as carbon-based materials, ferrites, and nanomaterials) and the optimization of structural geometries (commonly wedge-shaped, pyramidal, or a combination of flat and wedge elements).
Its core advantages lie in its targeted suitability for EMC testing requirements: First, broad-spectrum absorption capability—covering a frequency range from 10 kHz to 18 GHz (or even higher)—which satisfies the electromagnetic radiation and interference immunity testing needs of devices across diverse sectors, including wireless communications, automotive electronics, and medical instrumentation. Second, high absorption efficiency—characterized by a reflection loss typically ≤ -40 dB (reaching ≤ -60 dB in certain frequency bands)—which maximizes the elimination of electromagnetic wave reflections from the chamber walls and floor, thereby ensuring the accuracy of test data. Third, structural synergy—where the gradient distribution of composite absorbing agents and the specialized structural geometry (e.g., combining the low impedance of the wedge tips with the high loss of the base) create a gradual impedance transition, thereby minimizing electromagnetic wave reflection at the material's surface. Fourth, environmental adaptability—the polyurethane foam matrix undergoes flame-retardant and thermal-stability modifications (typically withstanding temperatures ranging from -50°C to 80°C), thereby meeting the fire safety and aging-resistance requirements essential for the long-term, stable operation of EMC anechoic chambers.
Furthermore, this material strikes a balance between lightweight design (with a density of 0.15–0.3 g/cm³) and ease of installation; it can be modularly customized to fit the specific dimensions of any anechoic chamber and possesses sufficient mechanical strength to withstand minor impacts during routine maintenance.
Characteristics and Parameters of Composite Polyurethane Foam Absorbing Material for EMC Anechoic Chambers
Physical Properties
● Shape:Typically features a flat top; available in blue (optional).
● Flexibility:Soft and pliable.
Flame Retardancy
● Performance:Exhibits excellent flame retardancy; Oxygen Index > 29% (per GB/T 2406-2009).
● Classification: Classified as Flame Retardant Grade B2 (per GB 8824-2012).
● Operating Conditions:** Temperature range: -50°C to +80°C; Relative Humidity: 55% ± 15%.
Absorption Performance
● Thickness-to-Wavelength Ratio (d/λ):This ratio influences reflectivity; generally, greater material thickness results in lower reflectivity.
Environmental Compliance
● Materials:The materials used comply with environmental protection standards; they are non-toxic, odorless, and emit no volatile substances.
● Integration: Must be used in conjunction with ferrite materials to achieve superior broadband performance.
● Matching Design: Features a specialized impedance-matching design between the ferrite layer and the absorbing layer to further broaden the effective bandwidth.
| Model | Base size (mm×mm) | Number of unit cones (pieces) | Unit size H×L×h (mm×mm×mm) | Standard weight (kg/m²) | Package box size H×L×h (mm×mm×mm) | Number of packages (sets) |
| ZKPUR-200J | 600*600 | 81 | 190×65×50 | 4.5 | 1280*650*650 | 12 |
| ZKPUR-300J | 600*600 | 36 | 300×100×60 | 7.3 | 1280*650*650 | 6 |
| ZKPUR-500J | 600*600 | 16 | 495×145×65 | 11.5 | 1280*650*650 | 4 |
| ZKPUR-700J | 600*600 | 9 | 700×195×130 | 16.5 | 1280*650*650 | 4 |
| ZKPUR-300P | 600*600 | 16 | 305×145×72 | 11 | 1280*600*600 | 4 |
| ZKPUR-500P | 600*600 | 9 | 495×195×110 | 13 | 1280*600*600 | 4 |
| ZKPUR-700P | 600*600 | 4 | 710×295×100 | 19 | 1280*600*600 | 2 |
| ZKPUR-1000J | 300*300 | 1 | 1000×300×150 | 23 | 1160*620*610 | 8 |
| ZKPUR-1000P | 600*600 | 1 | 1000×300×185 | 8 | 1200*620*620 | 2 |
Vertical reflection characteristic parameters of EMC dedicated composite polyurethane foam absorbing material for darkroom
| Model | Reflection loss when incident vertically(-dB) | Power capacity kW/m² | ||||||||
| 0.03(GHz) | 0.08(GHz) | 0.3(GHz) | 0.5(GHz) | 1(GHz) | 3(GHz) | 6(GHz) | 10(GHz) | 18(GHz) | ||
| ZKPUR-200J | 11 | 21 | 15 | 17 | 11 | 10 | 11 | 13 | 15 | 1.5 |
| ZKPUR-300J | 11 | 21 | 16 | 17 | 11 | 13 | 15 | 20 | 20 | 1.5 |
| ZKPUR-500J | 12 | 21 | 17 | 19 | 17 | 17 | 20 | 25 | 25 | 1.5 |
| ZKPUR-700J | 14 | 23 | 20 | 20 | 18 | 20 | 25 | 25 | 30 | 1.5 |
| ZKPUR-300P | 11 | 20 | 17 | 18 | 15 | 13 | 17 | 22 | 25 | 1.5 |
| ZKPUR-500P | 13 | 23 | 20 | 20 | 16 | 18 | 22 | 25 | 28 | 1.5 |
| ZKPUR-700P | 15 | 25 | 21 | 20 | 20 | 20 | 25 | 28 | 30 | 1.5 |
| ZKPUR-1000J | 15 | 25 | 25 | 25 | 23 | 22 | 28 | 28 | 35 | 1.5 |
| ZKPUR-1000P | 17 | 25 | 25 | 25 | 25 | 30 | 30 | 35 | 40 | 1.5 |
Please fill out the form below, we will be in touch with you shortly.
Back to Top
Committed to providing high-performance electromagnetic shielding, absorbing materials and EMC testing solutions for scientific research institutions, electronic communications, aerospace and confidential information security fields.
