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E-glass Yarn vs Silica Yarn: The High-Temperature Showdown | DOMADIA™
Introduction: The Battle of the Yarns Begins
In the world of advanced materials, two names often dominate the conversation — E-glass yarn and Silica yarn. Both are derived from glass fibers, both boast exceptional strength, and both have revolutionized industries ranging from aerospace to automotive. Yet, their differences in temperature endurance, tensile strength, and elongation at break make each uniquely suited to specific applications.
At DOMADIA™, we help engineers, designers, and manufacturers choose the right yarn that doesn’t just perform — but outlasts.
1. Composition & Manufacturing: The Chemistry Behind the Strength
| Property | E-glass Yarn | Silica Yarn |
| Primary Component | ~55% SiO₂ with Al₂O₃, B₂O₃, CaO | >96–98% pure SiO₂ |
| Manufacturing Process | Direct melt from glass batch | Leached chemically from E-glass to increase SiO₂ content |
| Appearance | White, smooth | White to off-white, slightly rougher texture |
E-glass yarn is the workhorse of the composites world — versatile, affordable, and mechanically strong.
Silica yarn, however, is the specialist — born from an acid-leaching process that boosts its SiO₂ content and heat resistance to extreme levels.
2. Mechanical Performance: Tensile Strength & Elongation at Break
When it comes to strength and flexibility, both materials perform exceptionally — but in different environments.
| Property | E-glass Yarn | Silica Yarn |
| Tensile Strength | 2,500–3,600 MPa | ~3,600 MPa |
| Elongation at Break | 3.5–4.7% | Up to 7.7% |
🔹 Insight: While both offer high tensile strength, Silica yarn demonstrates superior elongation, making it more flexible under high-temperature stress. This is why it’s often chosen for applications like furnace curtains and protective heat shields, where expansion and contraction are constant challenges.
3. Thermal Resistance: When the Heat Is On
| Property | E-glass Yarn | Silica Yarn |
| Max Continuous Use Temp | Up to 600°C | 1,000–1,100°C |
| Thermal Conductivity (W/m·K) | ~0.035 | ~0.06 |
E-glass performs impressively up to 600°C — enough for electrical insulation, reinforcement, and composites.
But Silica yarn takes the lead at temperatures exceeding 1,000°C, maintaining integrity and flexibility even when red-hot metals surround it.
4. Chemical & Electrical Properties
| Property | E-glass Yarn | Silica Yarn |
| Chemical Resistance | Excellent except in alkalis | Excellent except in HF and strong alkalis |
| Dielectric Strength | Good | Good to Superior |
Both materials resist most chemicals, but silica yarn is especially inert — making it a preferred choice in acidic or oxidative atmospheres. Electrically, both provide strong insulation, vital for transformer and cable applications.
5. Applications: Where They Shine
| E-glass Yarn | Silica Yarn |
| • Electrical insulation | • Furnace curtains & heat shields |
| • FRP composites | • Thermal insulation blankets |
| • Reinforcement in plastics | • Foundry & molten metal protection |
| • Construction fabrics | • Automotive exhaust systems |
| • Printed circuit boards | • Protective clothing |
At DOMADIA™, both yarns are available in customized forms — texturized, plied, or twisted — tailored for insulation, reinforcement, or extreme heat protection.
6. Cost vs. Performance: The Long-Term View
E-glass yarn remains the more cost-effective option for large-scale manufacturing. However, when long-term heat stability and reduced maintenance matter most, Silica yarn justifies its higher price.
From an environmental perspective, silica yarn’s longer lifecycle means fewer replacements and less material waste, aligning with DOMADIA™’s sustainable engineering goals.
Conclusion: The Verdict
If your application demands high strength, affordability, and versatility, E-glass yarn is your go-to performer.
But when the project involves extreme heat, harsh conditions, and long-term endurance, Silica yarn stands unchallenged.
At DOMADIA™, we empower industries to make the right material choice — one that combines performance, reliability, and environmental responsibility.
Ready to choose the right high-temperature yarn?
Partner with DOMADIA™ for superior E-glass and Silica yarn solutions that power industrial performance and durability.
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Talk to: Er.Pankaj Domadia | Kairav Domadia | Aadil Domadia | Pragati Sanap | Pooja N N
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