Overview
Ceramic Fiber Blanket 1600°C Mullite is the ultra-high-temperature specification — polycrystalline mullite fiber (3Al₂O₃·2SiO₂ phase, Al₂O₃ 72%+, with controlled SiO₂ stoichiometry for mullite dominance) produced by sol-gel chemistry similar to the 1430°C polycrystalline grade but with chemistry tuned for the extended temperature ceiling. The 1600°C continuous service capability is the highest in the fiber-blanket category — beyond this temperature, only refractory brick, castable monoliths, or specialty oxide ceramics survive.
The grade's defining capability is sustained service above 1500°C with linear shrinkage controlled to ≤3% at 1600°C 24-hour test. This serves two specific industrial contexts that no other fiber-blanket grade can cover:
- Ceramic firing kilns at peak temperatures 1500–1600°C — refractory firing, technical ceramic sintering, specialty industrial ceramic production — where mullite's high-temperature stability is the engineering enabler for the kiln's intended product chemistry.
- Glass furnace hot face at peak crown temperatures 1500–1550°C — premium glass production (display glass, special-formulation containers, technical glass) where furnace longevity at peak temperature is a competitive procurement requirement.
The 1600°C mullite grade carries the highest material cost in the ceramic fiber blanket range — typical 2.5–3× the 1260°C standard grade. The procurement decision is exclusively driven by the temperature ceiling requirement, not by thermal conductivity or other secondary characteristics. Where 1430°C ceiling is sufficient, the polycrystalline 1430°C grade is the cost-effective specification choice.
Technical Specifications
| Property | Unit | Value |
|---|---|---|
| Fiber chemistry | — | Polycrystalline mullite (sol-gel) |
| Al₂O₃ content | % | 72–80 |
| SiO₂ content | % | 18–28 |
| Crystalline phase | — | Mullite (3Al₂O₃·2SiO₂) dominant, with α-alumina trace |
| Bulk density | kg/m³ | 128 |
| Linear shrinkage (24h at 1600°C) | % | ≤3.0 |
| Linear shrinkage (24h at 1500°C) | % | ≤2.0 |
| Thermal conductivity at 400°C | W/(m·K) | 0.07–0.09 |
| Thermal conductivity at 800°C | W/(m·K) | 0.12–0.15 |
| Thermal conductivity at 1,200°C | W/(m·K) | 0.26–0.32 |
| Thermal conductivity at 1,400°C | W/(m·K) | 0.34–0.42 |
| Tensile strength | kPa | ≥65 |
| Fire classification (GB 8624) | — | Class A (non-combustible) |
| Standard roll dimensions | mm | 7,200 × 610 or 3,600 × 1,220 |
| Available thicknesses | mm | 12.5, 19, 25, 38, 50 |
Applications
Ceramic Firing Kilns (Premium Technical Ceramics)
Technical ceramic firing kilns operating at peak temperatures 1500–1600°C — for high-alumina refractory, advanced engineering ceramics, electrical insulator manufacturing, and specialty industrial ceramic products — use 1600°C mullite blanket as the radiant-section hot face. The grade's dimensional stability across the typical 12–24 hour firing cycle prevents kiln-temperature drift that would compromise ceramic product quality, and the multi-month campaign service life supports the production-economic model of modern technical ceramic plants.
Glass Furnace Hot-Face Insulation
Premium glass furnace crown and superstructure hot-face insulation operating at peak temperatures 1500–1550°C use 1600°C mullite blanket (25–50 mm thick) as the directly furnace-atmosphere-facing layer. The application requires extreme chemistry resistance to alkali vapour (Na₂O, K₂O), sulphate vapour, and high-purity glass-batch volatiles that would attack lower-grade fibers within months. The mullite phase resistance to alkali penetration is the engineering enabler for multi-year glass furnace campaigns.
Specialty Alloy and Superalloy Melting
Vacuum induction melting furnaces, atmosphere-controlled superalloy melt shops, and specialty steel melting operating at 1,500–1,650°C use 1600°C mullite blanket as the hot-face insulation. The grade's contamination control (low alkali, low Fe₂O₃) supports the metallurgical quality requirements of aerospace, medical, and electronic-grade alloy production where in-furnace contamination directly affects product mechanical properties.
Aerospace Ground-Test High-Temperature Facilities
Aerospace propulsion ground-test facilities, hypersonic vehicle materials testing, and military propulsion test stands use 1600°C mullite blanket in test-cell construction where simulated propulsion temperatures reach 1,500°C+ for sustained test runs. The grade's combination of temperature ceiling, dimensional stability, and reduced IARC exposure suit the high-instrumentation-density and frequent test-cell access typical of these facilities.
Specialty Refractory Manufacturing
Refractory manufacturing kilns producing high-alumina, mullite, or zirconia refractories operate at peak temperatures 1,500–1,600°C with multi-week firing campaigns. The application is a circular use of mullite fiber — the kiln lining itself is the fiber being supplied to the refractory industry. Internal kiln linings use 1600°C mullite hot face + 1430°C polycrystalline middle layer + 1260°C standard cold face in the typical multi-grade construction.
Packaging & Storage
Packaging matches the other polycrystalline grades — PE-film-wrapped rolls in 7,200 × 610 mm or 3,600 × 1,220 mm formats, packing density slightly reduced versus amorphous grades. Container shipment is typically 1,000–1,800 m² per 40' container in stock 25 mm thickness. MOQ is 100 m² sample, 1,000 m² production, 3,000 m² full-container.
Lead time is 5–7 weeks — the longest in the ceramic fiber range due to sol-gel production capacity constraints and the chemistry-control rigour required for the 1600°C-rated mullite product. Documentation is the most comprehensive in the range: independent crystallographic phase analysis (mullite dominance certification), linear shrinkage testing at 1500°C and 1600°C, chemistry analysis covering Al₂O₃, SiO₂, Fe₂O₃, Na₂O, and K₂O trace levels, and tensile strength testing.
Standard N95 respirator is sufficient for installation handling — polycrystalline fiber's lower IARC-relevant exposure characteristic applies to the 1600°C mullite grade as well as the 1430°C polycrystalline grade.
Related Products
- Ceramic Fiber Blanket Hub — full 6-grade portfolio
- Ceramic Fiber Blanket 1430°C Polycrystalline — lower-temperature polycrystalline grade
- Ceramic Fiber Blanket 1430°C HP — amorphous high-purity alternative for petrochemical service
- Ceramic Fiber Blanket 1360°C High-Purity — intermediate-temperature variant for glass cold-face service
- METHERM® Microporous M 1100 — extended-temperature microporous cold-face backup
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