Views: 0 Author: Site Editor Publish Time: 2026-09-04 Origin: Site
Melamine sponge empowers the Rail Transit industry: creating a new integrated solution for lightweight, flame-retardant, sound and heat insulation
With the rapid development of my country"s Rail Transit industry, Rail Transit equipment such as high-speed railways, subways, light rails, and trams continue to be iteratively upgraded, and train running speeds continue to increase. Passengers" requirements for ride comfort and travel safety are increasing. At the same time, the national "double carbon" strategy also sets higher standards for energy conservation and weight reduction of Rail Transit equipment. As an important part of Rail Transit equipment, vehicle interiors no longer just play a simple decorative role. Multiple performance indicators such as fire retardant, sound absorption and noise reduction, thermal insulation, lightweight, and strong environmental adaptability have become the core evaluation dimensions for interior material selection.
Traditional interior filling materials often have shortcomings such as insufficient flame retardancy, limited noise reduction effect, high weight, and performance degradation in temperature-changing environments, making it difficult to meet stringent multi-dimensional requirements at the same time. Against this industry background, JunhuaRail Transit special-purpose melamine sponge relies on the inherent comprehensive performance advantages of the material to provide rail vehicles with a complete solution that integrates safety protection, acoustic optimization, thermal management, and lightweighting. It is widely adapted to the complex working conditions of various rail vehicles and builds a safe, comfortable, and energy-saving train operating environment.
Junhua is deeply engaged in the research and development and production of melamine sponge materials, and carries out formula optimization and process iteration for the special working conditions of the Rail Transit industry. Each core parameter of the product has been tested by an authoritative third party and fully matches Rail Transit"s strict standards. The five core advantages build the core competitiveness of the product.
During train operation, a large amount of noise is concentrated in the mid- and high-frequency range. Wheel-rail impact and whistling, air-conditioning duct wind noise, and on-board equipment operation noise all fall into the category of mid- and high-frequency noise. JunhuaMelamine sponge has a three-dimensional connected pore structure. After sound waves enter the internal micropores of the material, they continue to rub against the inner walls of the pores. The sound energy is converted into heat energy consumption, achieving efficient sound absorption. The product"s noise reduction coefficient NRC ≥ 0.85, and its outstanding ability to absorb medium and high-frequency noise.
This material is placed inside the cabin walls, cabin ceilings, and equipment cabins, which can effectively absorb the reflected noise inside the cabin, reduce cabin reverberation, weaken the noise transmitted outward from the equipment cabin, effectively improve the passenger ride experience, and at the same time optimize the cab acoustic environment and reduce driver fatigue problems caused by long-term noise exposure. Unlike some sound-absorbing materials that require reserved cavities to achieve better sound-absorbing effects, Junhua melamine sponge can still maintain stable sound-absorbing performance in a limited installation space. It is suitable for the narrow filling space of the interior layer of rail vehicles and facilitates the design and layout of the vehicle body structure.
Rail TransitThe energy consumption of the vehicle cabin temperature control system accounts for a high proportion of the total vehicle energy consumption. The insulation ability of the filling material between the vehicle body skin and the interior directly affects the workload of the air conditioning and heating systems. JunhuaThe thermal conductivity of melamine sponge is ≤0.035 W/m·K. It has excellent thermal insulation capabilities. A large number of static micropores inside the material form an air barrier layer, effectively blocking the cold and heat conduction channels.
In the high-temperature environment in summer, it blocks the heat from outside the car body from entering the interior of the car; in severe cold conditions, it reduces the heat loss inside the car, stabilizes the temperature inside the cab and on-board equipment compartment, reduces the working pressure of the HVAC system, reduces the energy consumption of the entire vehicle, and helps Rail Transit equipment achieve energy-saving goals. For some special scenarios with higher thermal insulation requirements, an airgel composite modified version can also be provided to further reduce the thermal conductivity, enhance thermal insulation performance, and adapt to extreme temperature conditions.
Fire safety is the first assessment index of Rail Transit interior materials. Junhua melamine sponge is intrinsically flame retardant. The molecular structure of the base material has high nitrogen content. It can reach UL 94 V0 and B1 flame retardant levels without adding a large amount of additional flame retardants. It has also fully passed the EN45545-2 Rail Transit fire authority certification, meeting the fire protection requirements of Rail Transit vehicles around the world.
When encountering high temperatures from an open flame, the material will not melt or drip, nor will a flowing fire occur. A dense carbonized protective layer will quickly form on the surface, blocking the inward conduction of heat and oxygen, achieving self-extinguishing when removed from the fire, and has the characteristics of low smoke and low toxicity. In closed operation scenarios such as tunnels, it can effectively delay the spread of smoke when a fire occurs, buying valuable time for the evacuation of people in the vehicle. It perfectly adapts to the rigid fire safety requirements for interior materials in high-speed rail, subways, and trams, and is an important component of the rail transit passive safety system.
Rail TransitLightweight equipment is an important direction for the development of the industry. Reducing the weight of the car body can directly reduce the energy consumption of train traction, reduce wheel and rail wear, and extend the service life of the vehicle. JunhuaRail Transit The basic density of melamine sponge is only 8 kg/m³, and its weight is much lower than that of traditional rubber-plastic insulation, fiberglass wool and other filling materials under the same volume conditions. Without compromising all the core properties of sound absorption, heat insulation, and fire prevention, it greatly reduces the overall weight of the interior filling layer, effectively reduces the weight of the car body, helps the vehicle speed up, reduces operating energy consumption, and takes into account the dual demands of performance and lightweight.
At the same time, material density specifications support customization, and density parameters can be adjusted according to the working conditions in different areas to balance mechanical properties and weight reduction goals.
Rail TransitVehicles need to face intense heat, severe cold, and alternating hot and cold conditions in tunnels. The vehicle body continuously vibrates during the entire operation, and the interior filling materials need to withstand temperature changes, vibration and shock tests for a long time. JunhuaThe stable working temperature range of melamine sponge covers -160℃ to +240℃. It will not be brittle in extremely low temperature environments, will not shrink or deform in high temperature environments, has excellent aging resistance, and will not suffer from rapid performance degradation after long-term use.
At the same time, the product has anti-fog and anti-vibration properties. In the face of complex working conditions such as continuous train vibration and tunnel environmental humidity fluctuations, it can still maintain structural integrity, and its acoustic and thermal insulation properties are stable for a long time. It can adapt to the service cycle of rail vehicles for more than ten years and reduce later maintenance and replacement costs.
In addition, the product is green and environmentally friendly, has no formaldehyde, is low in VOC, does not shed dust fibers, and will not release harmful substances when used for a long time in a confined space in the car, ensuring the safety of the air environment in the car.
Rail Transit Different functional areas of the vehicle have different working environments, noise sources, temperature and humidity conditions, and fire protection level requirements. Junhua does not just provide standardized sponge sheets, but provides differentiated customized processing solutions for the pain points of different areas. Through CNC cutting, die-cutting, hydrophobic treatment, special-shaped molding and other processes, it produces finished parts suitable for each position, achieving precise matching installation and improving assembly efficiency.
The walls and ceiling of the carriage are the main interior areas that passengers come into contact with. They must not only ensure passenger comfort, but also must meet strict fire protection regulations. Melamine sponge is used in this position and is filled between the interior panel and the body skin to achieve the dual effects of sound insulation, noise reduction and fire protection. On the one hand, it absorbs the wheel rail and aerodynamic noise incoming from the outside and reduces the noise inside the carriage; on the other hand, it acts as a flame retardant barrier when a fire occurs, blocking the spread of flames and taking into account safety and comfort. The material is lightweight and will not add too much load to the car body, making it suitable for large-scale use in high-speed rail and subway passenger compartments.
The internal partition wall of the train separates different functional spaces such as passenger rooms and equipment rooms. The location of the partitions needs to take into account the multiple requirements of sound insulation, weight reduction, and fire protection. Junhua provides lightweight sound insulation fillers that have been precisely cut by CNC according to the size of the partition’s internal cavity. It has high dimensional accuracy and excellent sound insulation performance. The product is light in weight and easy to install on site. It is directly filled into the partition cavity, effectively blocking sound transmission between different spaces, while meeting fire protection standards and simplifying the car body assembly process.
The cab is the driver"s working area. Excessive noise will cause driver hearing fatigue and affect judgment and driving safety. In response to the acoustic optimization needs of cabs and vehicle vestibules, Junhua can customize wedge-shaped and pyramid-shaped melamine sponges to change the sound wave reflection path through special shapes, specifically weaken the reflected noise inside the space, reduce the reverberation time, optimize the driving acoustic environment, and help drivers maintain good working conditions. The specially-shaped sponge can be directly mounted on the inner wall of the cab, making it easy to install and maintain.
Inside the air ducts of the train HVAC system, the air humidity changes greatly and condensed water vapor is easily generated. When ordinary open-pore sound-absorbing materials encounter water vapor, they are easy to absorb water and become moldy, significantly reducing the sound-absorbing performance, and even breeding microorganisms, affecting the health of the ventilation system and the air inside the carriage.
Junhua A hydrophobic melamine sponge specially developed for HVAC systems has been modified through hydrophobic treatment, which can effectively isolate water vapor intrusion and eliminate internal mildew problems. Even in high-humidity ventilation conditions, the sound-absorbing performance remains stable and maintains the NRC ≥ 0.85 standard, and the flame retardant rating remains UL94 V0 and B1. The product can be processed into sheets or into special molded parts for pipes, suitable for the installation of ventilation ducts and air-conditioning duct linings of different specifications, and solves the industry problem of filling material failure in the high-humidity environment of rail transit heating and ventilation systems.
In addition to the above typical scenarios, this series of products can also be expanded to be used in vehicle equipment cabins, passageways and other locations. According to the temperature, vibration, and fire protection level requirements of the equipment cabin, the corresponding specifications can be matched to achieve heat insulation, noise reduction, and fire protection of the equipment cabin.
Shanghai Junhua New Materials Co., Ltd. is a high-tech enterprise specializing in the R&D, production and sales of melamine sponge. It has complete full-chain capabilities from raw material formulation research and development to finished product processing and delivery. It provides high-performance foam solutions for Rail Transit, Aerospace, new energy vehicles, industrial insulation, Building Acoustics and other industries. It has profound technology accumulation and large-scale production capabilities.
At the technical research and development level, the company holds 23 independent research and development patents, owns 7 registered trademarks, has established a comprehensive research and development testing laboratory, continues to carry out formula iterations for high-end industry working conditions such as aviation and aviation, and continuously optimizes key properties such as flame retardancy, hydrophobicity and aging resistance of materials. It can carry out directional development and customize special modified formulas according to customer project needs.
In terms of quality control, the company has established a strict quality management system and has obtained UL certification and IATF 16949 automotive industry quality system certification. It has also passed ISO 9001 quality management system, ISO 14001 environmental management system, ISO 45001 occupational health and safety management system and BSCI certification. Product quality meets internationally accepted standards and can support the supply of domestic and overseas Rail Transit projects. Each batch of products is equipped with a complete test report to ensure the compliance of project materials.
In terms of production capacity delivery guarantee, the company has an annual production capacity of up to 100,000 cubic meters and a warehousing area of 20,000 square meters. It is equipped with multiple flat cutting, vertical cutting, and die-cutting processing equipment, and has large-scale mass production and rapid processing capabilities. Whether it is a large-volume vehicle project or small-volume sample development, it can stably complete delivery and shorten customer supply cycles.
The processing service capabilities are diverse. In addition to conventional sheets, Junhua can provide a variety of deep processing services such as die-cutting, lamination, special-shaped processing, hydrophobic treatment, airgel lamination, etc. It can complete the processing of various special-shaped parts according to customer drawings; it supports different surface layers such as composite non-woven fabrics and aluminum foil to achieve additional functions such as waterproofing, protection, and easy bonding. It can complete material modification and molding processing in one stop, reducing secondary processing procedures for downstream customers.
Relying on the multiple advantages of technology, quality, production capacity, and customized processing, Junhua new material products have been widely used in Rail Transit, Aerospace, new energy vehicles, industrial insulation, Building Acoustics and other fields. It has deeply served many equipment manufacturing companies and accumulated a lot of experience in supporting high-end projects.
my country"s Rail Transit industry continues to move forward. In the future, high-speed EMUs and urban Rail Transit lines will continue to expand, and equipment updates and iterations will continue to accelerate. Lightweight, high safety, high comfort, and green energy saving will become the main line of long-term development of Rail Transit equipment. Interior filling materials are no longer simple auxiliary accessories, but an important part of vehicle safety, riding experience, and energy consumption control. Market demand will continue to be released for multi-functional materials that integrate flame retardancy, sound absorption, heat insulation, and lightweight.
As an engineering foam material with balanced performance, melamine sponge can continuously expand its performance boundaries and adapt to more extreme working conditions through technological upgrades such as hydrophobic modification, aerogel compounding, and surface compounding. JunhuaNew Materials will continue to develop melamine foam technology, continue to polish Rail Transit special products, keep up with industry standard updates, and continue to output customized solutions for different models of high-speed rail, subway, tram, and light rail, and use new materials to empower Rail Transit industrial upgrading.
