Types of Fiberglass Cloth
Jun 18, 2026
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Fiberglass cloth can be categorized in various ways, with different classifications corresponding to distinct types. Below is an introduction to the mainstream classification methods and their associated product categories:
Classification by Alkali Content
This is the most fundamental classification method in the industry; different categories exhibit significant differences in performance and application suitability:
Alkali-free cloth (E-glass): Alkali metal oxide content ≤0.5%. It offers excellent insulation properties and high mechanical strength. As the core raw material for electronic-grade fiberglass cloth, it is widely used in electrical insulation, high-end composite materials, and copper-clad laminate manufacturing.
Medium-alkali cloth (C-glass): Alkali metal oxide content ranges from 11.5% to 12.5%. It features outstanding acid resistance and lower costs, making it suitable for applications such as anti-corrosion engineering, general packaging, and construction mesh fabrics.
High-alkali cloth (A-glass): Performance is relatively ordinary; it is suitable only for low-end applications with minimal requirements for strength or insulation, such as packaging for simple construction materials.
Classification by Fabric Structure and Manufacturing Process
Woven fiberglass cloth: Includes types such as plain weave, twill weave, satin weave, and unidirectional cloth. Plain weave offers a tight structure and uniform stress distribution; twill weave provides good flexibility; and unidirectional cloth is suitable for components requiring high directional strength.
Roving cloth (Woven roving): Woven from continuous glass fiber rovings. It features rapid resin impregnation and consistent product strength, making it a common base material for hand lay-up fiberglass (FRP) products, shipbuilding, and automotive component manufacturing.
Non-woven fiberglass cloth (Fiberglass mat/veil): Formed directly from fibers without a crimped structure. It exhibits excellent strength and rigidity, making it ideal for industrial applications requiring high mechanical stability.
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