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What is Fiberglass?

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Author : Heaterk
Update time : 2022-07-04 15:31:12

What is Fiberglass

fiberglass insulation


Fiberglass is a fiber-reinforced plastic made from fiberglass. Fiberglass is additionally understood as fiberglass-strengthened plastic or fiberglass reinforced plastic.

Fiberglass is extremely solid, adaptable as well as lightweight. Fiberglass can be formed into several intricate forms, making it a superbly lightweight material structure product. Fiberglass is commonly used in tubs, watercraft, aircraft, roofing systems, and other insulation materials in a wide range of applications.

The world's leading glass fiber manufacturers, such as China Jushi Group, Owens corning, Nippon Electric Glass Co., Ltd., and many other well-known manufacturers, has established a complete glass fiber industry chain.


Today Heaterk will take you to an in-depth understanding of glass fiber from all aspects of the glass fiber industry.


What Does Fiberglass Look Like ?


Fiberglass dust, characterized by its delicate, powdery texture, typically exhibits a white or light gray hue. Despite its diminutive size, it can become visible when present in significant quantities or when disturbed, causing it to disperse into the air. Handling fiberglass demands utmost caution to prevent inhalation of this dust, as it potentially harms the respiratory system.


Fiberglass Production Process

Glass fiber cloth production process


The following processes are involved in the production of heat-resistant glass products. The raw ore is melted through a high-temperature furnace, and the obtained high-temperature slurry is formed into filamentous fibers through the wire drawing process.

After multiple molten glass manufacturing processes, the raw molten glass materials from glass filaments can be flattened into a sheet glass fiber cloth, glass wool composite material, aluminum foil composite glass fiber fabric, etc.


Fiberglass is produced through various manufacturing processes, including:


Hand Lay-up: In this process, fiberglass and resin sheets are manually applied to reusable molds with a hardener. The mold is coated with a release agent to prevent the fiberglass from adhering. Fiberglass mats are stacked until the desired thickness is achieved, followed by a curing process to ensure the product maintains its strength. Glass tape can reinforce the mold's edges during the hand lay-up process.


Spray-up: This method involves spraying resin and fiberglass onto the mold-like hand lay-up. Workers then use rollers to compress the material, ensuring proper compaction. After allowing the mold to cure, the finished product is removed from the reusable mold.


Compression Molding: In this technique, a sheet molding compound consisting of long fiberglass sheets is laid on a bed of polyester or epoxy and placed over a heated mold within a machine. The machine then applies downward force, enveloping the compound around the heated mold. This process is widely used for manufacturing cold water storage tanks, low-cost structures, electrical applications such as meter boxes, and high-volume production in the automotive and transportation sectors.


What is Glass Fiber Made From?


raw material


1. fiberglass production batching - preparing and mixing various powders according to the proportion of the process standard.

2. The fiberglass raw materials used are: pyrophyllite, calcite, boro site, silica sand, mirabilite, fluorite (soda ash, carbon powder)


Types of Glass Fibers

E: Good electrical insulation properties

C: Chemical resistance, corrosion resistant

A: High content of alkali metal oxides

D: good dielectric properties

S or R: high strength

M: High elastic friction

AR: Alkali Resistant

E-CR: good insulating properties and chemical resistance

AE: This glass fiber has excellent alkali resistance characteristics and is specially used in concrete


E-glass Fiber

1. Refers to the composition of alumino-borosilicate glass with an alkali metal (potassium and sodium) oxide content of less than 1%, usually called "E" glass internationally. "E" glass composition basis mainly includes SiO2, Al2O3, and CaO three-element systems.


Melting Point of Fiberglass


Melting - is to put the prepared and mixed batch materials into the pool kiln and melt them into glass liquid at high temperature.


The melting point of fiberglass refers to the temperature at which the material transitions from a solid state to a molten, liquid state. This property is crucial for determining the suitability of fiberglass for various high-temperature applications, such as thermal insulation in the automotive, aerospace, and construction industries.


Factors Influencing the Fiberglass Melting Point


The melting point of fiberglass can be influenced by several factors, including the types of glass fibers used, the manufacturing process, and the presence of additives or coatings. These factors can lead to variations in the melting point, impacting the material's performance under high-temperature conditions.


Fiberglass is primarily composed of silica (SiO2) in the form of silicon atoms, which form a network bonded at the corners by sharing the oxygen atoms. Other components, such as alumina (Al2O3), boron oxide (B2O3), and calcium oxide (CaO), can also be present in the type of glass used. The composition of the glass fibers directly affects the melting point. For example, E-glass fibers, which are predominantly composed of silica and alumina, have a melting point of approximately 1550°C (2822°F).


Manufacturing Process:

The method used to manufacture fiberglass can impact its melting point. For example, the rotary process involves a rotating spinner and, due to centrifugal force, spins molten glass into extremely fine fibers of glass with small diameters suitable for textile processing. This process typically produces fiberglass with a slightly lower melting point compared to the flame attenuation process, where glass fibers are drawn from a molten glass stream using high-velocity air or steam.


Additives and Coatings:

Additives and coatings can be incorporated into fiberglass to enhance its properties, such as heat resistance or chemical resistance. However, these additives can also affect the melting point of the material. It's essential to consider the potential impact of additives on the melting point when selecting fiberglass for high-temperature applications.


Furnace Melting Point section fuel: 80# heavy oil

1. Space temperature: 1550—1560℃

2. Glass temperature: 1440—1450℃

Furnace Pass Fuel: LPG

1. Space temperature: 1310—1330℃

2. Glass temperature: 1270—1300℃


The softening point, a related property, refers to the temperature at which glass flows, and is extruded into many fibers. This property is also essential in determining the material's suitability for specific applications.

The high ratio of surface area to weight (50 of surface area to weight) contributes to fiberglass's excellent insulating properties. However, humidity is an important factor in the tensile strength of fiberglass, as moisture can affect the material's performance.


Glass Fiber Drawing

What is the number of strands (Tex): the grams per kilometer g/Km.

The glass fiber drawing process is a fundamental aspect of optical fiber manufacturing and the production of other high-quality glass fibers. This highly specialized technique involves the delicate balance of heat transfer, draw tension, and precise control of gas flow, including argon gas, to create fibers with exceptional properties. In this introduction, we will explore the key elements of the glass fiber drawing process, emphasizing the significance of computational studies, radiative heat, and the role of the draw furnace in ensuring the production of top-tier fibers.


At the core of the glass fiber drawing process lies the draw furnace, a high-temperature heating device designed to maintain consistent heat transfer and radiative heat conditions. This carefully regulated environment facilitates the controlled melting of the glass preform, allowing it to be drawn into a neck down profile with high speed and precision.


During the drawing process, the gas flow, often consisting of argon gas, plays a critical role in protecting the glass fiber from contamination and ensuring an even temperature distribution. This gas flow management is essential for maintaining the structural integrity and quality of the fibers being produced.


Draw tension is another crucial aspect of the glass fiber drawing process, as it directly impacts the diameter and uniformity of the fibers. By closely monitoring and adjusting the draw tension, manufacturers can achieve the desired fiber dimensions and maintain consistent production quality.

Computational studies have significantly contributed to our understanding of the glass fiber drawing process, enabling us to optimize variables such as heat transfer, draw tension, and gas flow. These advanced simulations help improve the efficiency and effectiveness of the drawing process, ultimately leading to the production of high-quality optical fibers and other glass fiber products.


Fiberglass Filament Model

ECG75-1/0 0.7Z

E: "E" glass(alkali-free)

C: continuous fiber

G: Monofilament diameter

Z and S: twist direction

Twist: expressed as the number of twists per meter


Types of Glass Cloth

1. Divided by thickness:

      7628, 3732, 2025, etc.;

2. According to the diameter of a single fiber:

      5, 6, 7, 9µm;

3. Technical development direction of glass cloth:

CAF resistance (split fiber, high-performance sizing agent), high flat weaving technology (ultra-low twist yarn, cloth for laser drilling), and low dielectric constant.



Glass Fiber Properties


Lightweight: Fiberglass has a high strength-to-weight ratio, making it lighter than metals like steel and aluminum. Its lightweight nature significantly reduces overall product weight, resulting in increased fuel efficiency in automotive and aerospace applications.


Corrosion Resistance: Fiberglass exhibits excellent resistance to chemical and environmental corrosion, making it suitable for use in harsh environments such as chemical plants, marine vessels, and wastewater management systems.


Acoustic Properties: With a noise reduction coefficient (NRC) between 0.70 and 0.95, fiberglass effectively absorbs sound, making it a popular choice for acoustical insulation and noise reduction applications.


Flexibility: Fiberglass can be easily molded into complex shapes, enabling the creation of custom designs for various applications, including architectural elements and automotive components.


High Tensile Strength: Fiberglass has a tensile strength of 1,500-2,000 MPa, depending on the fiber type and manufacturing process, which contributes to its excellent mechanical properties.


Impact Resistance: The energy absorption capabilities of fiberglass make it ideal for products requiring high impact resistance, such as protective equipment, sports gear, and automotive bumpers.


Low Maintenance: Due to its corrosion resistance and non-rotting properties, fiberglass requires minimal maintenance, reducing long-term costs for applications such as building materials and infrastructure components.


Sustainability: Fiberglass is a recyclable material, and its energy-efficient production process results in lower CO2 emissions compared to traditional materials like steel and aluminum. This contributes to a more sustainable and eco-friendly industry approach.

Thermal Conductivity: Fiberglass is a poor conductor of heat, so it is commonly used for insulation in homes and other buildings. The thermal conductivity of fiberglass insulation typically ranges from about 0.035 to 0.040 watts per meter-kelvin (W/m·K) at room temperature, depending on the specific product and its density.


This means that fiberglass is very good at slowing down the transfer of heat, helping to keep buildings warm in the winter and cool in the summer. However, while fiberglass is a good insulator, it is not entirely waterproof to heat transfer. Proper installation is essential to ensure its effectiveness.


Is Fiberglass Conductive?

Fiberglass is not conducive. It is an insulator, meaning it does not readily conduct electricity. This is one of the reasons why it is commonly used in manufacturing circuit boards and other electrical components, where it provides structural support without interfering with the circuit's operation. It is also used in building insulation, where its insulating properties help to maintain temperature and prevent electrical fires.


Fiberglass Flammability

Glass fiber is an internationally recognized A-class fireproof material, whether the EU's BS or ASTM standards; glass fiber is an object that only melts and does not burn.

Therefore, glass fiber cloth is very suitable as a flame retardant material. Although glass fiber filaments made of different fuels have specific performance differences, their filaments softening point can still reach above 1330 °C.

(Learn more about glass fiber fire retardant knowledge)

What is Fiber Glass Used for?

Fiberglass is a versatile material that comes in various forms, each tailored to suit different applications. The primary types include:

Fibreglass Matting: In the form of a flattened sheet, known as a strand mat, fiberglass can be supplied for versatile applications.


Fibreglass TapeFiberglass tapes are comprised of glass fiber yarns, prized for their exceptional thermal insulation properties. These tapes are commonly utilized in the insulation of vessels, hot pipelines, and other similar applications. The thermal resistance of fiberglass tape makes it an ideal choice for industries requiring high-temperature protection.


Fibreglass ClothFeaturing a smooth texture, fiberglass cloth is available in multiple variations, such as glass fiber yarns and glass filament yarns. This material is widely used for creating heat shields, fire curtains, and other heat-resistant applications. The durability and heat resistance of fiberglass cloth makes it a popular choice for various industries, including aerospace, automotive, and construction.


Fibreglass RopeConstructed by braiding glass fiber yarns, fiberglass ropes serve as an effective packing material. Their flexibility, strength, and heat resistance make them suitable for a wide range of applications, including sealing oven doors, gaskets, and other high-temperature equipment.

Insulation Fibreglass fabric: silicone-coated fabric, PTFE high-temperature resistant fabric, Fiberglass Needle Mat


Fiberglass Needle Mat

Fiberglass Needle Mat



Heaterk's glass fiber needle felt-E is made of 100% E-grade glass fiber, with a temperature resistance of 650°C. It is made of precisely chopped fibers and mechanically bonded by needle punching without adding any adhesives to ensure efficient heat insulation and Excellent sound quality absorbs in different applications. The standard needle felt thickness ranges from 3mm to 25mm, and the uniform density ranges from 130kg/m³ to 220kg/m³, and other specifications can be customized upon request.



  • Exhaust muffler winding pipe
  • Die-cut and thermoformed parts
  • Assembly unit combined with other materials
  • Aluminum foil lamination plus self-adhesive


Learn More About Fiberglass Needle Felt > >

Silicone Coated Fiberglass Fabric

Silicone Coated Fiberglass Fabric



Silicone rubber fiberglass cloth coated with glass fiber cloth or impregnated with silicone rubber Electronic glass is usually based on glass fiber fabric woven from E-glass fiberglass. It comes with a silicone composite and is available as a single- or double-sided coating. The characteristics of silicone coated fiberglass fabric are: stronger tensile strength, better abrasion resistance, better aging resistance, high chemical resistance, high oil resistance, high fire resistance: can withstand up to 500 F° temperature.



  • as insulation
  • As a fire protection and fire blanket
  • as splash curtain
  • as the outer layer of the expansion joint
  • As the outer layer of the removable insulating jacket


Learn more about silicone coated fiberglass fabric > >

PTFE Coated Fiberglass Fabric

Teflon Coated Fabric



The PTFE coated fabric made of Teflon emulsion and glass fiber fabric produced by DuPont is divided into densely woven PTFE coated fabric and open mesh PTFE coated fabric. PTFE fabric has non-stick, antistatic, wear-resistant, and high temperature resistance. , non-toxic and tasteless, so the scope of use covers various fields from industry to food processing.



  • food processing
  • Release process
  • new energy
  • conveyor belt
  • package
  • Construction home improvement, flooring industry


Learn more about Teflon coated fabric > >


What are the Applications of Fiberglass in Various Industries?

Fiberglass, with its wide range of applications and impressive properties, has revolutionized various industries, from pulp and paper to construction. Its high strength-to-weight ratio, corrosion resistance, thermal insulation, and electrical insulation capabilities have made it invaluable in an ever-evolving world. As technological advancements continue, the potential for fiberglass to further transform industries is limitless.


High-temperature insulation materials, such as fiberglass, provide an effective thermal barrier for industrial gaskets. Fiberglass is not only durable and safe, but also offers superior thermal insulation. As a result, it has become a preferred material for industrial gaskets. These gaskets not only provide better insulation but also protect machinery, conserve energy, and ensure workforce safety. Fiberglass is widely used across various industries, including:


Pulp and Paper Industry

The pulp and paper industry has long sought materials that can withstand corrosive environments and maintain efficiency in production processes. Fiberglass, specifically alkali-resistant glass, provides an optimal solution with high tensile strength, lightweight, strong composition, and chemical resistance. In this industry, fiberglass is used in the construction of equipment like tanks, piping, and scrubbers, as well as in cooling towers for water treatment processes.


Manufacturing Processes

Fiberglass plays a significant role in many manufacturing processes thanks to its excellent strength-to-weight ratio, corrosion resistance, and ability to be flattened into a sheet. These properties make it ideal for creating lightweight, durable products like wind turbine blades, automobile parts, and airplane components. The material's high tensile strength and corrosion resistance also make it ideal for manufacturing tools and equipment.


Electrical Insulation

Fiberglass's unique properties make it an exceptional electrical insulator, providing both thermal insulation and chemical resistance. Glass fiber reinforced plastic (GFRP), a fiberglass type, is commonly used in electrical insulation applications due to its randomly arranged fibers, which prevent electrical conduction. Industries, such as power generation and telecommunications, benefit from GFRP's ability to insulate electrical components and maintain their performance.


Chemical Industry

The chemical industry requires materials that can withstand aggressive environments and maintain their integrity in the presence of corrosive substances. Fiberglass, specifically chemical glass, is widely utilized in this industry for constructing storage tanks, pipes, and other equipment that comes into contact with corrosive chemicals. The material's corrosion resistance and lightweight, strong composition make it an ideal choice for these applications.


Construction Industry

Fiberglass has revolutionized the construction industry with its lightweight, strong, and corrosion-resistant properties. Glass fiber-reinforced plastic (GFRP) is often used to construct bridges, beams, and other structural components, providing increased durability and reduced maintenance costs. Fiberglass's thermal and electrical insulator properties make it popular for building insulation materials and electrical conduits.


Beverage Industry:

Fiberglass grating is widely used in the beverage industry due to its corrosion resistance and ease of cleaning. Its applications include bottling lines, where spillage and high humidity are common, and brew houses, where hot liquids and steam can cause corrosion in metal materials.


Car Washes:

Fiberglass grating is increasingly popular in car washes for its rust resistance and ability to enhance the appearance of previously drab areas. Fiberglass brightens car wash tunnels, making vehicles appear cleaner and improving the overall customer experience.


Cooling Towers:

Fiberglass is an excellent choice for cooling towers because it resists rust, corrosion, and other safety issues associated with constantly wet environments. Fiberglass grating is used as screening to protect people and animals from danger zones and to maintain the structural integrity of the towers.


Docks and Marinas:

Fiberglass is an ideal material for docks and marinas due to its resistance to the corrosive effects of salty seawater. It also withstands weather elements, reducing maintenance costs and ensuring a longer lifespan for docks and marina infrastructure.


Food Processing:

Fiberglass grating is used in food processing facilities, particularly in chicken and beef plants, where it provides slip resistance and corrosion resistance against blood and other corrosive substances. Fiberglass is more suitable than many other grating materials, as it can be easily cleaned and sanitized.


Fountains and Aquariums:

Fiberglass is a popular choice for fountains and aquariums of all sizes. It supports rocks and other decorative elements while allowing water circulation and filtration. In large public fountains, fiberglass grating protects spray headers and lights from damage and helps prevent accidents by creating a barrier around the water.



Fiberglass grating is an excellent choice for manufacturing facilities where slip resistance is a priority, particularly in areas exposed to liquids such as hydraulic fluids or oils. Its durability and resistance to chemicals make it ideal for maintaining safe working conditions.


Metals and Mining:

Fiberglass grating is used in electronic refining areas where chemical corrosion is a concern. Its resistance to harsh chemicals and corrosive substances makes it a superior choice over other grating materials.


Power Generation:

Fiberglass is used in various power generation applications, such as tank farms, scrubbers, and other areas where electrical conductivity is a concern. Its non-conductive property ensures a safer working environment and reduces the risk of electrical accidents.


Plating Plants:

Fiberglass grating is popular in plating plants due to its anti-slip surface property, reducing the risk of accidents and providing a safer working environment for employees.


Pulp and Paper Industry:

Fiberglass is increasingly used in the pulp and paper industry, particularly in pulp and bleach mills, due to its corrosion resistance and anti-slip properties. It can withstand the harsh chemicals used in processing, ensuring a safer and more efficient working environment.


Automotive Industry:

Fiberglass is extensively used in the automobile industry for manufacturing lightweight, strong components and body kits. Its versatility and adaptability make it suitable for a wide range of automotive applications, from exterior panels to interior components.


Aerospace & Defense:

Fiberglass is an essential material in both military and civilian aerospace industries. Its strength-to-weight ratio and corrosion resistance make it ideal for manufacturing parts, test

If you want to learn more about fiberglass, why not contact the experts at heaterk? Whether it's continuous filament glass or carbon fiber, we've covered it and are happy to assist you.


Contact fiberglass fabric manufacturer

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