Ultra-high temperature polycrystalline mullite fiberboard and blanket for applications up to 1900℃.
Highest temperature grade ceramic fiber family using advanced polycrystalline mullite (3Al₂O₃·2SiO₂) fibers delivering exceptional thermal stability from 1600 °C to 1900 °C.
Polycrystalline mullite fiber board is a rigid, ultra-high-temperature insulation made from high-alumina polycrystalline fibre, for service beyond the limit of standard ceramic fibre — furnaces, kilns and reactors above 1400°C.
| Property | Value |
|---|---|
| Maximum service temperature | classification up to 1800°C; maximum service up to 1500–1650°C |
| Density | 300–600 kg/m³ |
| Thermal conductivity | 0.15–0.35 W/(m·K) at 800–1200°C mean |
| Standard thickness | 6–100 mm |
| Standard dimensions | 600×900 mm, 1000×1200 mm and custom |
| Fire classification | Non-combustible (refractory ceramic fibre) |
| Composition | polycrystalline mullite (Al₂O₃ 72–83%, Al₂O₃+SiO₂ ≥ 99%) fibre, inorganic binder |
| Standards | ASTM C1786 (mullite fiber products) |
Cut with a carbide blade, seat against the lining and support vertically. Use ceramic anchors rated for the service temperature; avoid mechanical shock on thin sections.
Manufactured to ASTM C1786 (mullite fiber products) and controlled under a documented quality system. Supplied by a manufacturer holding ISO 9001, CE and SGS certifications, exporting high-temperature insulation to 60+ countries since 1982.
Combines stable high-temperature performance with straightforward on-site fabrication. The material is asbestos-free, chemically stable in neutral and oxidising atmospheres, and supplied with full technical data sheets to support specification and inspection. Supplied by a manufacturer holding ISO 9001, CE and SGS certifications, exporting high-temperature insulation to 60+ countries since 1982.
Rosetexwool is a polycrystalline mullite fiberboard manufacturer and supplier serving more than 60 countries since 1982. Every polycrystalline mullite fiberboard is produced under a documented quality system certified to ISO 9001, CE and SGS, with batch-level traceability from raw material to finished product.
What our manufacturing capability covers:
For quotations, lead times or technical data sheets, contact our team with your specification and target service temperature. Explore the ceramic fiber insulation hub for the full range, or read the ceramic fiber insulation buying guide for selection support.
ceramic fiber blanket — Needled refractory blanket rated 1100–1430 °C with very low thermal conductivity and the thermal shock resistance that rapid furnace cycling demands.
ceramic fiber board insulation — Used for kiln linings, heat treatment equipment and cryogenic tank insulation where a self-supporting panel beats a flexible blanket.
composite silicate plate — A soft, flexible plate made from rare earth cotton for medium-temperature work to 600 °C, asbestos-free and easy to cut.
For the full ceramic fiber range, temperature grades and density options, see our ceramic fiber insulation guide.
For adjacent material options across temperature and application ranges, explore our rock wool insulation hub.
For deeper engineering guides on this material family, see our polycrystalline fiber modules specification and installation guide and our polycrystalline mullite fiber board 1600-1900 °C selection guide.
Standard refractory ceramic fibre (RCF) products are rated to about 1260-1430 °C and begin to crystallise and shrink once service temperature climbs past that range. Polycrystalline mullite fibre (PMF) is the next grade up: it stays dimensionally stable from 1600 °C to 1900 °C classification with minimal shrinkage, which is why it is specified for furnace hot faces that run where RCF would fail. For a full property-by-property comparison, see our polycrystalline wool fiber vs standard ceramic fiber guide.
Polycrystalline mullite fiber board sits at the top of the alumina-silica fibre range. Demand is concentrated in ultra-high-temperature process industries - laboratory and semiconductor furnaces, technical ceramics kilns, petrochemical crackers and aerospace test rigs - rather than general building insulation, so volumes are lower and specifications are stricter than for standard fibre. Cost is driven mainly by high-purity alumina content, energy-intensive firing and tight dimensional tolerances; buyers should budget by grade, density and finished size rather than by square metre alone. For sourcing and verification, see our PCW module supplier guide.
For the complete polycrystalline fiber family and technical selection, return to the ceramic fiber insulation hub.
Part of the Ceramic Fiber product family.
Last updated: October 15, 2026
Ceramic fiber insulation withstands temperatures from 1100°C to 1430°C, depending on the grade. Standard (ST) and High-Purity (HP) grades are rated for 1260°C, while High-Alumina (HA) handles 1360°C and Zirconia (HZ) reaches 1430°C. Always match the grade to your specific operating temperature.
The grades differ mainly in alumina (Al₂O₃) content and temperature rating. COM (1100°C) is the economy grade. ST (1260°C) is the standard industrial grade. HP (1260°C) offers higher purity with lower shot content. HA (1360°C) has higher alumina for superior thermal stability. HZ (1430°C) contains zirconia for the highest temperature resistance.
Yes. Our ceramic fiber products are 100% asbestos-free and manufactured to international safety standards. They are classified as non-carcinogenic under EU Directive 97/69/EC. We recommend standard PPE (gloves, dust mask) during handling, as with any fibrous insulation material.
Ceramic fiber blanket can be cut to size with a utility knife and secured using high-temperature anchors, pins, or stud welding. For furnace linings, a layered installation is recommended. For pipe insulation, wrap and secure with stainless steel bands. Full installation guidance and technical support are provided with every order.
Ceramic fiber is widely used in industrial furnaces, kilns, boilers, petrochemical heaters, power generation equipment, incinerators, and building fire protection systems. It is ideal for backup insulation, expansion joints, door seals, and high-temperature gaskets.
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Refractory ceramic fiber blanket, also marketed as ceramic fire blanket — Class A non-combustible insulation rated 1100–1430°C. Ceramic blanket insulation for furnaces, boilers, kilns & pipe wrap.
Cost-effective insulation board from rare earth cotton for medium-temperature applications up to 600℃.
Loose ceramic fiber bulk for filling, vacuum-formed shapes manufacturing, and custom insulation applications.
