What are Fiberglass Raw Materials?

Fiberglass is a fiber-shaped reinforcing material made from inorganic non-metallic materials, mainly produced by melting glass raw materials at high temperatures and drawing them into fibers. Its core advantages are light weight, high strength, corrosion resistance, and good insulation properties, making it the reinforcing skeleton in composite materials.

Key Components of Fiberglass Raw Materials

The chemical composition of fiberglass generally comes from:

  • Silica Sand: High SiO₂ content (50-70%), providing the main framework of the glass, determining its heat resistance and chemical stability.
  • Limestone: Supplies CaO, enhancing chemical stability and mechanical strength.
  • Dolomite: Supplies MgO and CaO, optimizing toughness.
  • Soda Ash: Acts as a flux, lowering the melting temperature.
  • Boric Acid or Borax: Forms borosilicate salts, improving thermal shock stability and acid-alkali resistance (especially in E-Glass).
  • Alumina: Increases strength and high-temperature resistance.
  • Other trace elements: Such as TiO₂ and Fe₂O₃ are used to adjust color and improve UV resistance.

Common Fiberglass Raw Materials Type

Type Chemical Composition Features Applications
 E-Glass  Low-alkali borosilicate  Good insulation, resistant to chemical corrosion, moderate cost  PCB substrate, composite materials, ship hulls
 C-Glass  High-alkali glass  Resistant to chemical corrosion  Chemical storage tanks, corrosion-resistant pipelines
 S-Glass  High silicon-aluminum content  High strength, high elastic modulus  Aerospace, military applications
 AR-Glass  Zirconium (ZrO₂) content  Strong alkali resistance  Concrete reinforcement, GRC panels
 ECR-Glass  Boron-free, fluorine-free composition  Superior acid-alkali resistance  Marine, wastewater treatment

 

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