Excellent sound absorbing material melamine sponge is a fully open three-dimensional grid structure system with a mesh length to diameter ratio (ie L/D) of between 10 and 20 and an open porosity of over 99%. Its extremely high opening ratio enables sound waves to effectively enter the deep layers of the foam, and transforms the vibration of the sound waves into the vibration of the mesh, so that the sound waves are completely consumed and absorbed, and the reflected waves are effectively eliminated.

According to BASF's test, the melamine sponge with a thickness of 5 cm absorbs up to 90% of the high-frequency sound waves, and this sound-absorbing property does not change much after the surface is covered with materials such as non-woven fabrics or textiles. At the same time, due to the three-dimensional grid structure with sufficient opening, the density of the melamine sponge is very low, only 10Kg/M3, which makes it convenient as a sound absorbing material for decoration.

At present, melamine sponges are widely used as sound absorbing materials in airports, railway stations, recording studios, theaters, factories, and the like. Not only flame retardant, but also no dripping, no toxic fumes. Melamine foam has excellent flame retardant effect, and the surface begins to burn only when it is in contact with open flame. Once it starts to burn, it immediately decomposes to generate a large amount of inert non-flammable gas to slow down the burning speed, and the burning surface quickly forms a dense coke layer. Therefore, it effectively blocks the development of combustion to the deep layer, and automatically extinguishes when the open flame leaves.

The melamine foam can meet the B1 grade low flammability material standard (German standard) and UL94-V0 high flame retardant material standard (American Insurance Association standard) as defined in DIN 4102 without adding any flame retardant. The dripping and smoke density of materials in the combustion process are two important indicators of material combustion evaluation, which are often ignored by users. Ordinary foams, such as polyethylene, polystyrene, polyurethane, etc., melt and produce droplets when burned, and the burning droplets flow along the ceiling, walls, pipes, etc., causing the fire to spread rapidly. This fatal shortcoming of the material is ineffective when the flame retardancy of the material is improved by the addition of a flame retardant. The melamine sponge does not melt during combustion and does not produce droplets. Polystyrene, polyurethane and other materials will produce a lot of toxic fumes during the combustion process, and many flame retardants will decompose at high temperatures and release deadly toxic gases, flame retardant modification and the addition of smoke inhibitors. It will bring about negative effects such as increased toxicity and increased costs. The melamine sponge t produces much less smoke when burned than the above materials, and does not release deadly toxic gases and does not cause environmental pollution. Excellent thermal insulation material and extremely thermal stability melamine sponge has a fully open three-dimensional grid structure system with a density of only 10Kg/M3 and an open porosity of over 99%. Its three-dimensional grid structure can be effective. Blocking heat is transmitted through air convection.

At the same time, melamine sponge is a thermosetting plastic with a high three-dimensional grid structure system, which has higher heat than polyethylene and polystyrene thermoplastic materials and polyurethane materials with lower cross-linking degree. Stability and aging resistance. The melamine foam can work at 180 ° C for a long time without decomposition and deformation. Only when it is in a high temperature environment above 400 ° C, obvious decomposition occurs. The working temperature of foams such as polyolefin, polystyrene and polyurethane is only 90 °C. When it exceeds 80 °C, decomposition and deformation occur, especially the shrinkage deformation will occur, which seriously affects the heat preservation performance. It is the light weight, flame retardant and extremely strong thermal stability of melamine sponge, which makes it an irreplaceable lightweight thermal insulation material. Chemical and hygienic melamine foam is made by high temperature foaming. It has no residual free formaldehyde. Its stable chemical structure and cross-linking system make it have unique chemical and physical stability and no droplets. It does not easily produce debris and its hygiene can meet food hygiene requirements. These features make it widely used in the fields of daily necessities, interior decoration and vehicle noise reduction decoration, and make installation very convenient.

Good secondary processing performance and easy-to-install properties The melamine sponge t foam can be easily processed into sheets and profiles by machining methods such as cutting, cutting and boring; the surface can be processed to meet the sound absorption requirements. Conical, tapered sound absorbing products; melamine sponge can be made into a sheet with a thickness of only 1mm; special materials can be made by hot pressing to meet various shape requirements. For example, a sheet of melamine sponge can be made into a embossed ceiling and a sound absorbing partition by hot pressing; the sheet can be made into a roll similar to a ""nonwoven fabric"" by hot pressing; The internal sound absorbing material of the machine conforms to the shape requirements.