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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.

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.


What is Glass Fiber Made of?

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


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.

Furnace melting 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℃


Glass Fiber Drawing

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


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 and Characteristics 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

  • High tensile strength, often used as reinforcement in glass fiber-reinforced plastic
  • Heat and Fire Resistant
  • Chemical resistance
  • Moisture-proof
  • Thermally stable
  • Good insulation performance
  • Thermal Insulation
  • The excellent low dielectric constant allows it to be used as an electrical insulator.

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 Fiberglass Used for?

Raw yarn: filament glass fiber, short fiber glass fiber, optical fiber conductor, glass fiber cloth fabric, etc.

Insulation 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 > >


If you want to learn about fiberglass, why not get in touch with 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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