High-weight aramid 1313 felt used for brake pad linings

Aramid 1313 nonwoven fabric is a nonwoven material produced by needle-punching para-aramid fibers (poly-paraphenylene terephthalamide). The para-aramid felt shown in this post has a basis weight of 1,900 grams per square meter, making it a high-basis-weight, high-thickness industrial-grade product. This implies higher material density, superior physical and mechanical properties, and outstanding thermal insulation and protective performance. Made by directly forming and consolidating fibers into a web, this material exhibits excellent isotropy, a fluffy structure, high filtration efficiency, and exceptional thermal insulation performance.

The advantage of aramid 1313 nonwoven fabric lies in its exceptional thermal stability and inherent flame retardancy—earning it the nickname “fire-resistant fiber.” It can be used stably at temperatures up to 220℃ for extended periods, maintaining its performance for over a decade with minimal thermal shrinkage. It begins to decompose only when the temperature exceeds 370℃; during carbonization at around 400℃, it neither melts nor drips, effectively preventing secondary damage. Thanks to these properties, its limiting oxygen index (LOI) is greater than 28, enabling it to self-extinguish once removed from the ignition source. Even when subjected to brief, ultra-high-temperature shocks ranging from 900℃ to 1300℃, the fabric surface rapidly chars and thickens, actively forming a robust thermal insulation barrier.

This material also exhibits excellent electrical insulation properties and extraordinary radiation resistance. Even under harsh conditions such as high and low temperatures and high humidity, it maintains an extremely low dielectric constant and inherent dielectric strength, ensuring stable insulation performance. Particularly noteworthy is its outstanding resistance to alpha, beta, chi, and gamma radiation—enabling it to maintain structural integrity and mechanical strength in environments with intense radiation exposure, a capability that many conventional fibers simply cannot match. Moreover, its chemical structure is exceptionally stable, allowing it to withstand the corrosive effects of most high-concentration inorganic acids, organic solvents, and oils. It also boasts excellent resistance to hydrolysis, making it highly reliable even in demanding chemical environments.

As a flexible polymer material, the nonwoven fabric made from it retains excellent softness and fluffiness while boasting high strength, outstanding abrasion resistance, and tear resistance—making it highly convenient for subsequent processing and lamination. For high-basis-weight specifications such as 1900 grams per square meter, its physical properties have been comprehensively enhanced: the thicker fiber layer can trap more still air, significantly reducing the thermal conductivity and thereby improving thermal insulation performance. Moreover, the substantial increase in fiber content per unit area endows this material with tensile strength, compressive strength, puncture resistance, and overall durability that far exceed those of conventional products. Its fluffy, dense structure also delivers exceptional compression resilience and sealing performance, making it ideal for applications with stringent requirements for cushioning and sealing.

Application fields of aramid 1313 felt:

Aramid 1313 nonwoven fabric (1900 gsm) is a specialized protective material designed for high-temperature and highly reliable operating conditions. It features flame retardancy, thermal resistance, stable electrical insulation, and exceptional chemical resistance. Through its uniform and fluffy nonwoven structure, this material transforms into outstanding thermal insulation, filtration, electrical insulation, and structural reinforcement capabilities.

1. High-temperature industrial insulation and protection

High-temperature equipment thermal insulation pads: Used for thermal insulation covering of high-temperature pipelines, furnaces, valves, and other equipment in industries such as metallurgy, chemical engineering, and glass manufacturing, effectively reducing heat loss and protecting external structures.

Thermal insulation layer for specialized protective clothing: As a critical thermal-insulating lining in multi-layer composite garment systems such as fire-fighting suits, welding suits, and protective garments for furnace operators, its fluffy structure effectively inhibits heat conduction. When exposed to fire, it chars to form an additional barrier, thereby protecting the wearer.

2. High-temperature flue gas filtration

It is used as the filter bag or filter cartridge substrate for baghouse dust collectors in applications involving high-temperature flue gases, such as chemical plants, thermal power plants, cement plants, and waste-to-energy incinerators. With its exceptional long-term temperature resistance—capable of continuous operation at temperatures up to 204°C—and excellent chemical corrosion resistance, it effectively filters high-temperature dust and recovers valuable materials, offering a long service life.

3. High-end electrical insulation

Insulating materials used in electrical equipment such as Class H motors (withstanding temperatures up to 180℃) and above, transformers, generators, and other similar devices. Compared to traditional Class E insulating materials (withstanding temperatures up to 120℃), the use of aramid 1313 nonwoven insulating paper or composite materials enables these devices to operate safely at higher temperatures, significantly extending their service life—by several times—and facilitating the miniaturization and weight reduction of the equipment.

4. Aerospace and Transportation Composites

As a core material for honeycomb sandwich structures, when combined with composite panels, it is used in aircraft interior wall panels, high-speed train interiors, yacht decks, and more. This structure boasts an exceptionally high strength-to-weight ratio and stiffness-to-weight ratio—nine times that of steel—and is flame-retardant and compression-resistant. It is a key material for achieving lightweighting and enhanced safety in transportation vehicles.

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