Views: 0 Author: Site Editor Publish Time: 2025-07-05 Origin: Site
Fiberglass fabric (commonly E-glass) is a key reinforcement material in mica-based insulation products, enhancing mechanical strength, thermal stability, and electrical insulation. Below is a detailed overview of its role, types, and applications in mica composites.
1. Why Fiberglass Fabric is Used in Mica Products
Fiberglass fabric (typically E-glass) is combined with mica to:
Improve tensile strength – Prevents cracking or tearing of mica sheets.
Enhance flexibility – Allows mica composites to be bent or shaped without breaking.
Boost thermal resistance – Withstands high temperatures (up to 500–600°C, depending on resin).
Provide electrical insulation – Mica + fiberglass offers excellent dielectric properties.
Increase durability – Resists moisture, chemicals, and mechanical stress.
2. Types of Fiberglass Fabrics for Mica Products
Type | Characteristics | Common Use in Mica Products |
E-Glass Fabric | Standard electrical grade, cost-effective, good insulation | Mica tapes, flexible sheets, insulation barriers |
S-Glass Fabric | Higher tensile strength, more expensive | Aerospace, high-stress mica composites |
Siliconized Fiberglass | Heat-resistant, coated with silicone | High-temperature mica heaters, industrial gaskets |
Alkali-Free Fiberglass | Better chemical resistance | Long-life insulation in harsh environments |
3. Common Mica-Fiberglass Composite Products
Mica Tapes – Used in motor/generator windings, wrapped with fiberglass for strength.
Flexible Mica Sheets – Reinforced with fiberglass for heaters, gaskets, and insulation.
Rigid Mica Laminates – Fiberglass-mica layers bonded with epoxy/silicone for circuit boards.
Mica Tubes & Bushings – Fiberglass adds structural integrity for high-voltage insulation.
4. Manufacturing Process
Impregnation – Fiberglass fabric is coated with mica flakes + resin (silicone, epoxy).
Layering – Multiple plies of mica and fiberglass are stacked.
Pressing & Curing – Heat and pressure are applied to form rigid/flexible sheets.
Post-Treatment – Some products are silicone-coated for extra heat resistance.
5. Key Properties of Fiberglass-Reinforced Mica
✅ Temperature Resistance: Up to 500–600°C (silicone-bonded).
✅ Dielectric Strength: 10–30 kV/mm (depends on thickness).
✅ Tensile Strength: 300–500 MPa (with fiberglass reinforcement).
✅ Flame Retardant: Self-extinguishing (meets UL94 V0 standards).
6. Applications
Electrical Insulation: Motors, transformers, busbars.
Heating Elements: Industrial heaters, household appliances.
Aerospace & Automotive: Fireproof barriers, thermaln shields.
Power Electronics: Insulating spacers, circuit board substrates.
7. Alternatives to Fiberglass for Mica Reinforcement
Aramid Fiber (Nomex/Kevlar) – Better impact resistance but less thermally stable.
Carbon Fiber – Stronger but conductive (unsuitable for insulation).
Ceramic Fiber – Higher temperature resistance but brittle.
8. Suppliers & Grades
Changzhou Xingao Insulation Materials Co.,Ltd.
Changzhou Right Composite Co.,Ltd.
No.72,Sangyuan Village,Zhenglu Town,Changzhou,Jiangsu,China
Conclusion
Fiberglass (especially E-glass) is the most widely used reinforcement for mica products due to its balance of strength, thermal resistance, and electrical insulation. For extreme temperatures, siliconized fiberglass or S-glass may be preferred.
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