Pre-oxidized silk fireproof cotton is used in the field of sound insulation

Pre-oxidized fiber fire-resistant cotton applied in sound insulation

In the hustle and bustle of the city, the noise of traffic, the flow of water in building pipes, and the sounds of neighbors' lives... these ubiquitous noises are like invisible fine sand, quietly seeping into our desired peaceful living spaces, eroding our focus and sleep. Seeking a material that can effectively reduce noise and has reliable fire safety performance has become a key requirement in building and interior design. Pre-oxidized fiber fire-resistant cotton, with its unique origin and excellent comprehensive performance, stands out among many applications with its dual advantages of flame retardancy and sound insulation, becoming an ideal choice for building safe and quiet spaces.

What is pre-oxidized fiber non-woven fire-resistant cotton?

The core matrix of pre-oxidized fiber fire-resistant cotton is pre-oxidized polyacrylonitrile (PAN) fiber. After pre-oxidation treatment, the fibers are strengthened through non-woven fabric forming processes such as needle punching, thermal bonding, or hydroentanglement, resulting in pre-oxidized fiber non-woven fire-resistant cotton with stable structure and excellent performance.

Excellent characteristics: Safety, stability, and acoustic advantages

The reason why pre-oxidized fiber fire-resistant cotton is favored in the field of sound insulation and fire prevention stems from its series of outstanding physicochemical characteristics:

Excellent flame retardant and fire-resistant properties : This is its core advantage. After pre-oxidation treatment, the limiting oxygen index (LOI) of the fiber is significantly increased, usually as high as 38% or more, far exceeding the 21% of ordinary materials. This means that it is difficult to ignite in normal air; even if it comes into contact with an open flame, it only shows carbonization, almost no molten drops are produced, effectively inhibiting the spread of flames, self-extinguishing after removing the flame, and releasing very low smoke toxicity, providing a solid barrier for life and property safety.

Excellent thermal stability : Pre-oxidized fibers can work stably at 200-300℃ for a long time and withstand a momentary temperature of 1000℃. In a fire, it can effectively delay heat transfer and protect the internal structure.

Good chemical stability : Resistant to corrosion by most acids, alkalis, and organic solvents, it is not easy to age and has a long service life.

Excellent sound absorption and sound insulation performance : Its interior is composed of a large number of fine, fluffy, and interlaced fibers, forming a rich three-dimensional network porous structure. When sound waves enter, the sound energy is effectively converted into heat energy and consumed through friction between fibers, viscous resistance of air, and resonance inside the pores. This gives pre-oxidized cotton a significant sound absorption effect in the mid-to-high frequency bands, and its dense structure also has a certain ability to isolate the propagation of airborne sound.

Environmental protection and safety : The production process is relatively clean, and the final product does not contain harmful substances such as asbestos and formaldehyde, meeting modern environmental protection requirements. It does not release toxic gases when burned in an open flame and is degradable.

Excellent physical properties : It has a certain strength and toughness, and is easy to cut, lay, and install.

Applications: From safety protection to acoustic optimization
With the above characteristics, pre-oxidized fiber fire-resistant cotton has many application fields:

High-temperature industrial fields: Heat insulation and sealing materials for high-temperature equipment, pipelines, and kilns.

Fire safety field: Fire door core filling, fire blocking materials, fire curtains, fire suit insulation layers, fire insulation of transportation vehicles (high-speed rail, ships, aircraft) bulkheads.

Building insulation field: Building exterior walls and roof insulation layers with high fire protection requirements (especially suitable for sandwich panels).

Electrochemical field: Fuel cell gas diffusion layer substrate, electrode substrate.

Composite materials field: As a reinforcing agent or functional filler.

Emerging prominence: Application of pre-oxidized fiber fire-resistant cotton in sound insulation

Among many applications, the use of pre-oxidized fiber fire-resistant cotton as sound insulation cotton is showing strong vitality and unique advantages. Its inherent flame-retardant properties perfectly solve the hidden dangers of traditional sound-absorbing materials (such as ordinary polyester fiber cotton, rock wool, and glass wool) in fire safety or the irritating nature of construction, especially suitable for places with strict requirements for both safety and acoustic performance:

Sound insulation of building drainage pipes:

Drainage pipes (such as PVC-U pipes) in buildings, especially high-rise residential buildings, will produce obvious gurgling water sounds and impact sounds during drainage, seriously affecting indoor quietness.

Cut the pre-oxidized fiber fire-resistant cotton into appropriate sizes and tightly wrap it around the outside of the drainage riser or horizontal pipe. Its fluffy structure can efficiently absorb the vibration noise and mid-to-high frequency water sounds generated by the water flow impacting the pipe wall. Compared with ordinary rubber-plastic insulation cotton, pre-oxidized cotton has a higher fire rating, greatly reducing the risk of fire spreading along the pipes, and is environmentally friendly and harmless.

Usually fixed with special pipe clamps or flame-retardant tape. Access ports need to be reserved or designed with a movable wrapping structure.

Noise control in public places:

In airports, high-speed rail stations, subway stations, shopping mall atriums, large conference rooms, restaurants, and hospital corridors, there are generally problems such as long reverberation time and high background noise.

Use pre-oxidized fiber fire-resistant cotton as a sound-absorbing layer filled behind wall sound-absorbing boards (such as perforated gypsum boards, metal boards, wood fiber boards, etc.), or directly make flame-retardant sound-absorbing soft packs, sound-absorbing bodies (such as space sound absorbers, sound-absorbing screens) and hang them on the walls or ceilings. It can effectively absorb reflected sound, reduce reverberation, improve speech clarity, and create a more comfortable acoustic environment.

Filled inside the furring strips or pasted/fixed to the base layer. Large-area ceilings need to consider structural load-bearing capacity. Pre-oxidized fiber self-adhesive fire-resistant cotton can also be directly pasted.

Professional acoustic spaces, recording studios, piano rooms, and home theaters:

These spaces have extremely high acoustic requirements, needing precise control of reverberation time, elimination of standing waves and flutter echoes. Simultaneously, there are many valuable pieces of equipment inside, making fire safety a critical concern.

Pre-oxidized fiber fire-resistant cotton is an ideal choice for constructing acoustic walls, floating floor layers, sound-absorbing ceiling layers, and low-frequency trap fillers. Its excellent sound absorption performance (especially in mid-high frequencies) and superior fire resistance provide a safe and reliable base material for professional acoustic engineering. In a piano room, it can absorb piano sound reflections, making the tone purer and clearer, and preventing excessive sound leakage from disturbing others.

It is often used in conjunction with various acoustic structural designs (such as elastic shock-absorbing walls, rooms within rooms), filling cavities or serving as a sound-absorbing layer.

Sleep Pods/Space Capsule Hotels:

In the small, enclosed space of a sleep pod in a space capsule hotel, the requirements for sound insulation (to ensure sleep privacy and quiet) and fire prevention (many electrical devices, high density of people, and difficult escape) are extremely high.

Pre-oxidized fiber fire-resistant cotton is an excellent choice for filling the layers of the cabin wall panels. It can effectively block airborne sounds such as conversations and snoring from adjacent cabins and absorb reflected sounds within the cabin to improve sound quality. Its B1-level non-combustible characteristic provides important passive fire safety protection for the sleep pod, reducing the risk of fire.

Used as a core material filling during the production of cabin panels, or later filled into the cabin wall framing.

Convenient Construction: Self-adhesive versions facilitate efficient installation.

To further enhance construction convenience, pre-oxidized fiber fire-resistant cotton is available in a self-adhesive version. These products have a high-performance flame-retardant pressure-sensitive adhesive pre-applied to one side of the material, covered with release paper for protection.

Simplified Process: No need for additional glue application; simply peel off the release paper and directly adhere to a clean, dry, and flat substrate (such as metal pipes, concrete walls, wood, etc.).

Improved Efficiency: Significantly saves construction time, especially suitable for pipe wrapping, small area repairs, and adhering to irregularly shaped surfaces.

Strong Adhesion: Uses high-quality flame-retardant adhesive to ensure long-term stable and reliable adhesion under various conditions.

Performance Retention: The adhesive layer itself must also be flame-retardant, not affecting the overall fire and sound insulation performance of the material.

Particularly suitable for sound insulation wrapping of drainage pipes, noise reduction attachment of equipment casings, local sound absorption reinforcement of walls, and sealing of joints.

From the silent protection hidden in wall pipes to the acoustic optimization covering the inner walls of piano rooms; from creating the ultimate safe and quiet sleep pods to filtering the noise of busy public places—pre-oxidized fiber fire-resistant cotton, with its inherently flame-retardant "hardcore" safety properties and efficient sound energy absorption physical structure, provides a reliable and efficient solution for modern buildings and living spaces.

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