Fiberglass Mat: A Review Of High-performance Inorganic Industrial Basic Substrates

Fiberglass mat is an inorganic non-metallic non-woven fiber product made from alkali-free E-glass mineral raw materials through high-temperature melting and drawing, wet forming, and sizing and curing. With its excellent comprehensive properties such as high-temperature resistance, fire resistance, corrosion resistance, electrical insulation, dimensional stability, and aging resistance, fiberglass mat has become an indispensable core material in the fields of new energy, electrical and electronic engineering, industrial corrosion protection, high-end building materials, and composite materials. It is widely used in various harsh working conditions and is a functional substrate for modern high-end industrial manufacturing.

 

I. Basic Product Characteristics and Material Advantages

 

The core raw material of fiberglass mat is alkali-free E-glass, which does not contain alkali metal oxides and is essentially a stable inorganic silicate structure. The raw material is derived from natural minerals and melted and drawn into micron-level ultrafine continuous glass fibers at temperatures exceeding 1000 degrees Celsius. The fibers are uniform in fineness and high in purity, and the substrate itself possesses extremely strong chemical and thermal stability. Compared with organic fibers and polyester materials, fiberglass mat fundamentally solves the shortcomings of flammability, easy aging, easy hydrolysis, and low temperature resistance.

 

This product has an overall inert inorganic structure, is non-flammable, non-combustible, does not produce molten droplets, and releases no toxic fumes when burning, meeting the Class A non-combustible fireproof standard. It also possesses excellent insulation properties, chemical corrosion resistance, and structural stability, enabling it to withstand complex and harsh environments such as high temperatures, humidity, acids and alkalis, salt spray, and outdoor exposure for extended periods.

 

II. Core Production Process Characteristics Currently, high-end industrial-grade glass fiber mats generally employ a wet-process matting process.

 

The forming principle is similar to papermaking, which is a core technological advantage distinguishing it from ordinary dry-process chopped strand mats. This is also key to the mat's fine uniformity, stable strength, and suitability for high-end applications.

 

The production process mainly includes glass melting and drawing, fiber chopping, water dispersion pulping, low-concentration uniform web formation, vacuum dehydration, precision sizing, segmented drying and curing, online testing, slitting and winding, and other steps. The fibers are fully dispersed in water, without clumping or bundles, and are randomly laid out in all directions through oblique web forming, resulting in a uniform, fine, and dense fiber distribution on the mat surface. By precisely controlling the adhesive content and oven curing curve, the fiber cross-nodes are firmly bonded, ultimately forming a thin felt product with high flatness, uniform weight, good flexibility, and stable performance.

 

Compared to dry-processed felt, wet-processed fiberglass thin felt has a smoother and finer surface, more uniform thickness, no pinholes or coarse fibers, and superior wettability, adhesion, and dimensional stability, making it more suitable for high-requirement applications such as precision insulation, anti-corrosion surface layers, high-end waterproofing, and precision filtration.

 

III. Core Performance Advantages

 

1. High Temperature Resistance, Class A Fire Resistance, High Safety and Stability

Fiberglass thin felt can withstand long-term operating temperatures of 300–500℃, with even higher instantaneous temperature resistance. The material does not burn, drip, or smoke when exposed to open flames, and releases no toxic or harmful substances, resulting in a high fire safety rating. It does not soften, shrink, or melt under high-temperature conditions, maintaining structural integrity for a long time and effectively blocking heat spread, making it suitable for various fireproofing, heat insulation, and high-temperature protection applications.

 

2. Corrosion and Aging Resistance, Suitable for Harsh Working Conditions

The product possesses excellent resistance to acids, alkalis, oils, and organic solvents. It is not easily hydrolyzed, pulverized, or aged. Whether in chemically corrosive environments, damp underground projects, or long-term outdoor exposure, it maintains stable performance, with a service life far exceeding that of ordinary organic materials, and extremely low performance degradation over long-term use.

 

3. Excellent Insulation and Stable Electrical Performance

As a high-quality inorganic insulating substrate, glass fiber felt has high volume resistivity and stable dielectric properties. It maintains good insulation capabilities even under humid and high-temperature environments, is non-conductive and leak-proof, effectively avoiding the risks of electrical breakdown and short circuits. It is a core insulating material for electrical equipment, new energy batteries, and circuit board substrates.

 

4. Dimensional Stability and Excellent Mechanical Properties

Glass fiber felt has good tensile strength and tear resistance, a dense and uniform structure, and is not easily shrinked, deformed, or warped under heat, moisture, or stress, exhibiting extremely high dimensional stability. During composite molding, high-temperature curing, and long-term outdoor service, it maintains a flat and stable structural shape, ensuring consistent quality of end products.

 

IV. Main Application Areas

 

1. New Energy and Electrical & Electronic Fields

Widely used in lithium battery cell thermal insulation, battery module fireproofing, circuit board substrates, busbar insulation, switchgear, transformer insulation pads, etc. Leveraging its Class A non-combustible, high-temperature resistant, high-insulation, and dimensionally stable advantages, it effectively improves the safety protection level of electrical equipment and new energy products.

 

2. Industrial Corrosion Protection Fields

It is a key reinforcing material for pipeline corrosion protection, tank linings, chemical corrosion-resistant flooring, and equipment corrosion-resistant surface layers. The thin felt is delicate and smooth with good wettability, and can be perfectly composited with resins, asphalt, and other materials to form a dense anti-corrosion system, effectively blocking acid, alkali, water vapor, and soil erosion, significantly improving the durability of the anti-corrosion layer.

 

3. High-End Building Waterproofing and Fireproofing Materials

As a high-quality base material for waterproof membranes, it replaces traditional polyester base materials, offering high temperature resistance, aging resistance, and strong weather resistance, making it suitable for roofs, underground projects, tunnels, and other long-term outdoor damp environments. It can also be used for fireproof duct cladding, fireproof partitions, and thermal insulation composite panels, providing reliable protection for building fire protection and waterproofing systems.

 

4. Fiberglass and Composite Material Reinforcement

Fiberglass surface felt is commonly used on the surface of fiberglass products. It effectively covers fiber texture, improves surface smoothness, seals micropores, and significantly enhances the weather resistance, corrosion resistance, and impermeability of fiberglass products. It is widely used in chemical storage tanks, pipelines, sanitary ware, molds, and composite material profiles.

 

5. Industrial Filtration and Special Thermal Insulation

With its corrosion resistance, high temperature resistance, and uniform pore size, it is suitable for chemical liquid filtration, medium- and high-temperature flue gas pre-filtration, and industrial fluid purification. It can also be used as thermal insulation and flame-retardant linings for automobiles, rail transportation, and industrial equipment, adaptable to various special high-temperature protection conditions.

 

V. Summary

Fiberglass felt combines multiple advantages such as high-temperature fire resistance, insulation and corrosion resistance, aging resistance, dimensional stability, and good adhesion. It is a high-end inorganic functional substrate that balances safety, stability, and durability. Relying on mature wet production technology and a stable raw material system, the product quality is uniform and controllable, and it is suitable for high-end applications in many fields such as new energy, electrical, anti-corrosion, building materials, and composite materials. It is an indispensable basic and strategic functional material in modern industrial manufacturing.