Pre-oxidized aramid woven fabrics meet the safety performance requirements for nonwoven interior materials used in high-speed train seats.

Kaidun New Materials supports custom-made, proportionally blended preoxidized silk-aramid woven fabrics. The woven fabric shown in this post is a customized product in which preoxidized silk (polyacrylonitrile preoxidized fiber), serving as the matrix material, accounts for 90%, while aramid (aromatic polyamide fiber), acting as the reinforcing material, makes up 10%. The fabric has a basis weight of 230 grams per square meter.

Preoxidized silk is an intermediate product used in the manufacture of carbon fibers. It boasts excellent high-temperature resistance, flame retardancy, and thermal insulation properties. Under high-temperature conditions of 300℃, it can maintain stable performance over the long term; when exposed to a 900℃ flame, it can withstand more than 3 minutes without burning or melting. Its limiting oxygen index exceeds 50%, making it a long-lasting flame-retardant material. Aramid fiber, on the other hand, is renowned for its exceptional mechanical strength, high modulus, and outstanding heat resistance. Its strength can be 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, and its weight is only about one-fifth that of steel wire.

Performance:

1. Excellent mechanical properties

Pre-oxidized aramid blended woven fabrics exhibit excellent tensile strength and tear resistance. When the fabric is subjected to external forces, the aramid fibers—acting as reinforcing materials—can effectively absorb and distribute impact energy, preventing stress concentrations that might otherwise lead to localized damage. As a result, the overall durability and mechanical stability of the product are significantly enhanced. Moreover, after the incorporation of aramid fibers, both the fabric’s tensile strength at break and its elongation at break are improved, increasing the fabric’s density and making its structure more robust.

2. Wear resistance and fatigue resistance performance

Pre-oxidized aramid blended woven fabrics exhibit outstanding abrasion resistance, primarily due to the high strength and excellent friction resistance of aramid fibers. This characteristic makes these blended fabrics particularly well-suited for applications that involve frequent use, washing, or exposure to friction—such as protective clothing and industrial filter materials.

This fabric also boasts excellent fatigue resistance. The tough matrix of preoxidized silk fibers can effectively distribute and absorb cyclic stresses, reducing the direct impact on aramid fibers and thereby extending the product’s fatigue life.

3. Thermo-mechanical properties

Pre-oxidized silk fibers themselves exhibit high thermal stability, maintaining stable performance over the long term even in high-temperature environments of 300℃, and capable of withstanding instantaneous temperatures up to 1000℃. Aramid fibers also demonstrate excellent heat resistance: meta-aramid can be used continuously at temperatures as high as 205℃, and retains high tensile strength even under higher temperatures above 205℃. The combination of these two fibers’ thermal stabilities ensures that blended fabrics maintain consistent mechanical properties over a wide temperature range, without experiencing significant performance changes due to temperature fluctuations.

This blended textile exhibits low thermal shrinkage and outstanding dimensional stability even in high-temperature environments. Preoxidized silk fibers do not melt, soften, or shrink at high temperatures; they remain solid and do not produce droplets. This unique property prevents the fabric from shrinking or deforming when exposed to sudden temperature spikes. Aramid fibers share similar characteristics—they neither melt nor drip at high temperatures and begin to carbonize only when the temperature exceeds 370°C. These low thermal-shrinkage properties are crucial for applications such as high-temperature filtration and protective clothing, ensuring that the material maintains its original dimensions and shape under extreme heat conditions and avoids performance degradation or functional failure caused by shrinkage.

4. Thermal protection performance

Pre-oxidized silk-aramid blended woven fabrics exhibit excellent thermal insulation performance and the ability to radiate heat. In high-temperature environments, pre-oxidized silk fibers effectively block heat transfer, reducing the conduction of thermal energy from the high-temperature side to the low-temperature side and thereby maintaining a relatively stable temperature on the low-temperature side. Aramid fibers also possess outstanding thermal insulation properties, with a low thermal conductivity that helps minimize heat penetration through the fabric. The combination of these two fibers creates a synergistic thermal insulation effect, enabling the blended fabric to withstand even higher temperatures and providing effective thermal protection for industrial thermal equipment and protective clothing.

This fabric features flame-retardant protective properties. In the event of flash fires, electric arcs, or other high-temperature hazards, the material can provide users with extended escape or protection time.

5. Chemical resistance

Pre-oxidized silk-aramid blended woven fabrics exhibit excellent thermal insulation performance and the ability to radiate heat. In high-temperature environments, pre-oxidized silk fibers effectively block heat transfer, reducing the conduction of thermal energy from the high-temperature side to the low-temperature side and thereby maintaining a relatively stable temperature on the low-temperature side. Aramid fibers also possess outstanding thermal insulation properties, with a low thermal conductivity that helps minimize heat penetration through the fabric. The combination of these two fibers creates a synergistic thermal insulation effect, enabling the blended fabric to withstand even higher temperatures and providing effective thermal protection for industrial thermal equipment and protective clothing.

This fabric features flame-retardant protective properties. In the event of flash fires, electric arcs, or other high-temperature hazards, the material can provide users with extended escape or protection time.

Application areas:

1. High-temperature filtration field

Pre-oxidized silk-aromatic polyamide blended woven fabrics are used in high-temperature gas filtration applications such as industrial flue gas treatment, metal smelting, and chemical processes. This blended fabric combines the excellent heat resistance of pre-oxidized silk with the mechanical strength of aromatic polyamide, enabling it to withstand highly corrosive, high-temperature filtration environments and delivering efficient, long-lasting filtration performance. The high-temperature resistance of pre-oxidized silk ensures that filter bags can operate continuously without aging or losing effectiveness at flue gas temperatures ranging from 250 to 300°C, while the reinforcing effect of aromatic polyamide enhances the filter bags' abrasion resistance, thereby extending their service life even in environments with high dust concentrations.

2. Security Protection Field

In high-temperature, fire-prone, and high-risk industrial environments, pre-oxidized aramid blended woven fabrics can be used to manufacture firefighting suits, industrial thermal protective garments, welding suits, and other specialized protective equipment. Pre-oxidized aramid boasts exceptionally outstanding flame-retardant properties; its high-temperature resistance surpasses that of conventional aramid fibers. Moreover, it maintains stable fiber performance even at temperatures as high as 300°C, can withstand flames at 900°C for more than three minutes, has an extreme oxygen index greater than 50%, and exhibits characteristics such as no melting, softening, or shrinkage during combustion, as well as no dripping of molten material.

In preoxidized silk-aramid blended fabrics, aramid fibers provide essential tear and impact resistance, while the preoxidized silk enhances the material’s thermal stability and flame retardancy, making it suitable for applications that involve both mechanical impact risks and high-temperature fire hazards—such as in ballistic and impact-resistant fields.

In high-risk environments such as metallurgy, welding, and glass manufacturing, pre-oxidized aramid blended fabrics can be used to produce textile cut-resistant gloves and industrial protective equipment, offering a comfortable and pleasant wearing experience. These fabrics do not unduly restrict workers' freedom of movement, while also boasting a high safety factor and being environmentally friendly.

3. Transportation sector

Pre-oxidized aramid blended woven fabrics can be used for interior trim in transportation vehicles, such as seat fabrics, headliner materials, side-wall trims, and carpets—these are all interior components. The appropriate incorporation of pre-oxidized fibers can meet the mechanical and safety performance requirements for nonwoven interior materials used in high-speed train seats. Aramid fibers, on the other hand, provide the necessary mechanical strength and abrasion resistance, ensuring that the interior materials do not prematurely wear out during prolonged use.

In terms of thermal insulation and noise reduction for transportation vehicles, aramid fibers can be used in applications such as engine compartment insulation, exhaust pipe insulation, and thermal protection for passenger cabins. The excellent mechanical properties of aramid fibers help enhance the structural strength and durability of thermal insulation components. Moreover, the porous structure of the fabric and the inherent fiber characteristics contribute to noise absorption, thereby improving ride comfort.

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