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In the acoustic management system of data centers and computer rooms, the middle layer material of sound insulation panels directly determines the overall noise reduction effect and operational safety. The 100% meta-aramid felt with a thickness of 3mm and a grammage of 300-330 g/m², relying on its unique material properties and precise performance adaptability, has become a preferred material in this field, building an acoustic barrier for the stable operation of digital infrastructure.
Material Essence: The Performance Foundation of Meta-Aramid
100% meta-aramid (Aramid 1313) is the core component of this felt. The dense benzene ring structure in its molecular backbone endows the material with inherent superior properties. As a leader among organic high-temperature resistant fibers, its thermal stability is outstanding—it can be used continuously at 180°C without performance degradation. Even when exposed to 220°C for a short period, it will not soften, melt, or become brittle, and only begins to decompose slowly above 370°C. This characteristic enables it to easily cope with the high-temperature environment formed by the continuous heat dissipation of server clusters in data centers, avoiding performance degradation of traditional sound insulation materials due to thermal aging. Flame retardancy is another core advantage of meta-aramid. Its Limiting Oxygen Index (LOI) is greater than 28%, much higher than the 21% oxygen content in air, making it a typical flame-retardant material. When exposed to fire, it neither burns nor supports combustion, nor produces molten drips—only surface carbonization occurs. This fundamentally eliminates the risk of fire spread, fully complying with the strict fire safety standards of data centers. In addition, the material also has excellent dimensional stability, with a thermal shrinkage rate of only 1% at 250°C, ensuring the structural integrity of sound insulation panels after long-term use.
Acoustic Performance: Precisely Adapted to Data Center Noise Characteristics
The noise in data centers mainly comes from medium-to-high frequency continuous sound waves generated by equipment such as server fans and air conditioning units. The 3mm thickness and 300-330 g/m² grammage design of this meta-aramid felt is precisely optimized for this characteristic to enhance acoustic performance. The three-dimensional porous structure of the meta-aramid felt, formed through a needle-punching process, provides an ideal path for sound wave attenuation. When sound waves penetrate the material, they undergo multiple reflections, refractions, and scatterings in the fiber gaps. At the same time, the viscous resistance generated by fiber vibration converts sound wave energy into heat energy for dissipation, thereby achieving efficient sound absorption.
Although the acoustic performance of acoustic materials varies with thickness and density, reference to data on similar functional felts shows that the Noise Reduction Coefficient (NRC) of this specification of meta-aramid felt can stably stay in the medium-to-high range. It can effectively absorb the main noise in data centers within the 2000-8000 Hz frequency band. When used as the middle layer of sound insulation panels, it forms a composite structure with the panel and backsheet. By optimizing the sound wave propagation path, the Weighted Sound Transmission Loss (Rw) of the overall sound insulation panel can be increased to 24-29 dB, significantly reducing the interference of data center noise on the external environment and minimizing the impact of indoor sound wave reflection on equipment maintenance personnel.
Data Center Adaptability: Comprehensive Value Beyond Sound Insulation
The special environment of data centers imposes multi-dimensional requirements on materials. Beyond its sound insulation function, this meta-aramid felt demonstrates comprehensive adaptability advantages. Its low density of 0.29 g/cm³ not only ensures acoustic performance but also does not significantly increase the overall weight of the sound insulation panel, avoiding additional loads on the data center’s ceiling and wall structures. With a warp direction tensile strength greater than 1100N/5×20cm and a weft direction tensile strength greater than 1300N/5×20cm, it is not easily damaged during processing, cutting, and installation, adapting to the composite process requirements of various sound insulation panels.
The high humidity and multi-equipment operation environment in data centers put forward high demands on material stability. Meta-aramid has natural non-hygroscopicity and chemical stability—it is not prone to mildew or performance fluctuations due to changes in environmental humidity, and can also withstand erosion from common cleaning agents and maintenance chemicals in data centers. More importantly, the material contains no volatile organic compounds (VOCs) such as formaldehyde and releases no chemically irritating substances. In the closed space of data centers, it will not harm the health of maintenance personnel, while avoiding the risk of fiber dust pollution to equipment, which is common with traditional materials like glass wool.
Application Logic: The Functional Core of Sound Insulation Panel Systems
In the composite structure of sound insulation panels, the 3mm meta-aramid felt, positioned as the middle layer, plays a key role as an "energy conversion hub." When sound waves hit the panel of the sound insulation panel, part of the energy is reflected, and the remaining energy penetrates the panel and enters the middle layer. The porous structure of the meta-aramid felt first absorbs medium-to-high frequency sound waves. After the remaining energy is attenuated multiple times between its fibers, it is further blocked by the backsheet, forming a complete noise reduction chain of "reflection-absorption-blocking."
This middle layer design not only makes up for the insufficient sound transmission loss of a single panel but also solves the problem of weak low-frequency vibration blocking capacity of pure porous materials. Compared with traditional middle layer materials, it does not rely on additional flame-retardant treatments or moisture-proof coatings—its inherent properties can meet the long-term use needs of data centers, extending the service life of sound insulation panels to more than 10 years. In practical applications, it can be compounded with metal panels, fire-resistant substrates, etc., into a finished product through simple cutting and bonding processes, adapting to various installation scenarios such as data center walls and ceilings.
In today’s era of rapid digital economy development, the acoustic environment and operational safety of data centers are becoming increasingly important. The 100% meta-aramid felt with a thickness of 3mm and a grammage of 300-330 g/m², with its comprehensive performance combining efficient sound insulation, high-temperature resistance, flame retardancy, and environmental stability, has become a professional choice for the middle layer of sound insulation panels, providing reliable acoustic protection and safety support for the continuous operation of data centers. 
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