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Classification of Fiberglass Cloth

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Fiberglass cloth can be classified based on several factors, including weave type, fiber composition, weight, coating, and application. Below is a detailed classification:

1. By Weave Type

The weave pattern affects strength, flexibility, and appearance.

Weave Type

Description

Common Uses

Plain Weave

Simplest pattern (over-under), balanced,   good stability

General-purpose insulation, composites

Twill Weave

Diagonal pattern, more flexible &   drapable than plain weave

Aerospace, marine, high-strength parts

Satin Weave

Fewer interlacings, smooth surface, high   flexibility

Molded composites, decorative finishes

Leno Weave

Locked warp fibers, prevents unraveling,   open mesh

Reinforcement for thin structures

Unidirectional

Fibers run mostly in one direction for   max strength in that axis

Structural beams, wind turbine blades

2. By Fiber Composition

Different glass types offer varying properties.

Type

Properties

Applications

E-Glass

Standard, electrical insulation, good   strength & corrosion resistance

General composites, circuit boards

S-Glass

Higher tensile strength & heat   resistance than E-glass

Aerospace, military, ballistic armor

C-Glass

Chemical-resistant, used in corrosive   environments

Chemical tanks, pipelines

AR-Glass

Alkali-resistant for concrete   reinforcement

Construction (GFRC, stucco mesh)

3. By Weight (oz/yd² or g/m²)

Fiberglass cloth weight affects thickness and durability.

Weight Range

Thickness

Typical Uses

0.5–3 oz/yd²

Very thin, lightweight

PCB reinforcement, delicate repairs

4–10 oz/yd²

Medium weight

Marine hulls, automotive parts, roofing

>10 oz/yd²

Heavy-duty

Structural reinforcement, industrial uses

4. By Coating/Treatment

Coatings enhance performance for specific needs.

Coating Type

Purpose

Applications

Silane

Improves adhesion to resins

Fiberglass-reinforced plastics (FRP)

PTFE (Teflon)

Non-stick, heat-resistant (up to 500°F/260°C)

High-temperature conveyor belts

Fire Retardant

Self-extinguishing, meets safety   standards (e.g., ASTM E84)

Fire curtains, protective clothing

Vinyl-Coated

Waterproof, UV-resistant

Truck tarps, awnings

5. By Application

Application

Preferred Fiberglass Cloth Type

Composite Layup

Satin weave E-glass (6–10 oz/yd²) for   resin infusion

Electrical Insulation

Plain weave E-glass (thin, silane-coated)

Marine Repair

Biaxial or triaxial weave (waterproof,   heavy-duty)

High-Temperature

S-glass or PTFE-coated cloth (heat   shields, exhaust wraps)

Automotive

Lightweight twill weave (carbon-fiber   look for panels)

6. Specialty Fiberglass Cloths

  • Warp-Knitted Fiberglass – Stretchable for complex molds.

  • Aramid-Fiber Hybrid – Combines fiberglass with Kevlar for      impact resistance.

  • Copper-Clad Fiberglass – For EMI/RFI shielding in      electronics.

Key Considerations When Choosing Fiberglass Cloth

  • Temperature Needs: E-glass (600°F) vs. S-glass (1000°F).

  • Strength Requirements: Unidirectional for load-bearing parts.

  • Chemical Exposure: C-glass for acids/alkalis.

  • Flexibility: Satin weave for curved surfaces.


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