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High Silica Fiberglass Filter Mesh VS E Glass Fiberglass Filter Mesh

Sep. 14, 2026

High Silica Fiberglass Filter Mesh VS E-Glass Fiberglass Filter Mesh

Technical Data Comparation:

Item	High Silica Fiberglass Filter Mesh	E-Glass Fiberglass Filter Mesh
SiO₂ Content	≥96%	52%–56%
Continuous Working Temperature	1400–1620℃	700–800℃
Peak Temperature Resistance	Up to 1700℃	Max 850℃
Fiber Structure	Porous silica structure, with internal micro-pores	Dense solid glass fiber, no micro-pores
Mechanical Property	Brittle, medium strength, anti high-temperature scouring	High toughness, flexible, anti-impact, not easy to break
Filtration Mechanism	Block large slag + adsorb fine micro inclusions	Block oxide slag, mainly stabilize melt flow
Applicable Metal Melt	Iron, ductile iron, steel, stainless steel, copper alloy, high temp aluminum	Only aluminum alloy
High-temperature Stability	Excellent, no softening, no shedding, no contamination	Poor above 850℃, fiber melting & collapse
Application	High temperature ferrous & copper alloy precision casting	Ordinary aluminum alloy gravity / low-pressure casting
Cost	Higher	Economical & cost-effective

Application Scenarios:

Item	High Silica Fiberglass Filter Mesh	E-Glass Fiberglass Filter Mesh
Application Scenarios	1. Grey iron, ductile iron, cast steel and stainless steel castings 2. Brass, bronze and other copper alloy castings 3. Heavy-section castings, long pouring cycles and high-precision castings (valves, pumps, hydraulic parts) 4. Superheated molten aluminum casting	1. Aluminum alloy gravity casting, low-pressure casting, sand casting and permanent mold casting 2. Gate and riser filtration; standard material for aluminum cap filters
Main Function	Block large slag clusters and adsorb fine oxide inclusions to prevent slag holes and inclusion defects.	Block aluminum oxide skin and floating slag, stabilize melt flow, reduce air entrapment and secondary oxidation.
Limitations	Poor resistance to strong alkali melt.	For aluminum alloy only. Prohibited for iron, steel and copper casting. Fibers melt and collapse at high temperature, causing serious inclusion defects.

Material Comparison

Item	High Silica Fiberglass Filter Mesh	E-Glass Fiberglass Filter Mesh
Raw Material & Process	E-glass fabric treated by high-temperature acid leaching to remove boron, calcium and other soluble components, then sintered at high temperature	E-glass raw materials melted and drawn into filaments directly, woven with virgin fiber, no acid purification
SiO₂ Content	≥96%	52%～56%
Main Composition	High purity SiO₂	SiO₂, B₂O₃, CaO, Al₂O₃; alkali oxide ＜0.8%
Fiber Microstructure	Porous silica skeleton with internal micro-pores	Dense solid glass fiber, no internal micro-pores
Chemical Properties	Good high-temperature chemical inertness, no reaction with molten iron and copper; poor resistance to strong alkali	Stable at room temperature. Boron and calcium components decompose above 850℃, contaminating iron and copper castings
Texture	Brittle, easy to break when folded	High toughness, foldable and tear-resistant

Manufacturing Process Comparison

Item	High Silica Fiberglass Filter Mesh	E-Glass Fiberglass Filter Mesh
Base Fabric	E-glass fabric used as base material	Directly use virgin E-glass filament
Key Procedures	1. Weaving 2. High-temperature acid leaching to remove boron and calcium 3. Washing and neutralization 4. Sintering at 600~800℃ 5. Cutting	1. Melt glass raw materials and draw into E-glass filaments 2. Weave filaments into mesh fabric 3. Impregnation with high-temperature resin 4. Heat setting 5. Cutting / cap forming
Process Features	Acid leaching + high-temperature sintering to remove low-melting components and form porous high-purity silica fibers	No acid leaching or sintering. Simple process: weaving and resin impregnation
Process Purpose	Improve temperature resistance, form micro-pores and ensure stability in hot molten metal	Provide mesh toughness and prevent fiber fraying

Summary

High Silica Fiberglass Filter Mesh

✅For grey iron, ductile iron, steel casting and copper alloy casting.

✅Captures furnace slag, refractory debris and oxide inclusions during pouring to eliminate slag and sand defects.

✅Handles molten metal up to 1600℃.

✅Can also be used for aluminum casting at extreme heat but at higher cost.

E‑Glass Fiberglass Filter Mesh

✅Exclusive for aluminum casting: gravity casting, low-pressure die casting, sand casting.

✅Blocks aluminum oxide skin and slag, rectifies melt flow and reduces turbulence & re-oxidation.

✅Most gate cap filters are made of E-glass.

✅When scrap parts are remelted, the filter floats on the surface of molten aluminum and can be easily skimmed off for recycling.

❌❌❌They are not suitable for pouring molten iron or steel. At high temperatures, the material melts and breaks down, contaminating ferrous castings.

Next: Foundry filtration solutions from Hebei Cangchen