High Silica Fabric vs. Fiberglass Fabric: Key Differences

1. Composition:

   • High Silica Fabric: Contains ≥95% pure silica (SiO₂), offering exceptional purity and minimal additives.

   • Fiberglass Fabric: Typically 50-60% silica blended with oxides (e.g., calcium, boron) for cost-effective production.

2. Temperature Resistance:

   • High Silica: Withstands 1,800–2,300°F (982–1,260°C), ideal for extreme heat (e.g., welding, furnace linings).

   • Fiberglass: Rated for 1,000–1,500°F (538–816°C), suitable for general insulation and composites.

3. Thermal Stability:

   • High Silica: Retains flexibility and strength under rapid thermal cycling; resists melting and thermal shock.

   • Fiberglass: May become brittle at sustained high temps; prone to degradation under thermal stress.

4. Applications:

   • High Silica: Specialized uses in aerospace, fire curtains, molten metal protection, and high-temperature gaskets.

   • Fiberglass: Common in construction, automotive parts, marine composites, and HVAC insulation.

5. Chemical Resistance:

   • High Silica: Superior resistance to acids, alkalis, and corrosion.

   • Fiberglass: Moderate resistance; vulnerable to prolonged chemical exposure.

6. Physical Properties:

   • High Silica: Smoother texture, lighter weight, and lower thermal conductivity for better insulation.

   • Fiberglass: Rougher texture, heavier, and more abrasive (requires careful handling).

7. Cost:

   • High Silica: More expensive due to purity and specialized manufacturing.

   • Fiberglass: Cost-effective for bulk or industrial applications.

8. Safety:

   • Both release respirable fibers, but high silica’s stability reduces friability over time.

High silica fabric excels in extreme heat and corrosive environments, while fiberglass offers a versatile, economical solution for moderate temperatures. Choose based on thermal demands, budget, and application specificity.