Polycrystalline Mullite Fiber Board: Rigid, Precise, Built for Heat

2025-11-03

What is Polycrystalline Mullite Fiber Board?

PMF board is formed by wet-process filtration and pressure molding of mullite fibers into a dense, rigid panel. The result is a stable, easy-to-machine board that maintains strength and insulation performance at elevated temperatures.

• Classification temperature: 1200–1900 °C (grade-dependent)
• Form factor: rigid boards, custom shapes/cut parts
• Finish: clean edges, smooth surface, consistent thickness

Need the exact grade list and datasheet? Comment “SPEC” or contact us and we’ll send the PDF within 24 hours.

Why engineers choose PMF board

• Low k, low heat capacity → faster heat-up/cool-down, reduced energy loss
• Thermal-shock resistance → better integrity under cycling and openings
• Erosion & corrosion resistance → durable against hot gas flow and many atmospheres*
• Precision machining → supports slots, holes, countersinks, chamfers
• Lightweight → easier handling and lighter steelwork

* Always validate compatibility with your process media and atmosphere.

Typical applications

• Hot-face or backup insulation in kilns, heat-treat, sintering and glass furnaces
• Burner blocks, peep/observation doors, lintels and door linings
• Baffles, shields and flow guides in high-velocity hot gas areas
• Nonstandard shapes for lab furnaces, thermal analysis equipment and pilot lines

Machining & installation

PMF board cuts cleanly and can be machined to tight tolerances.

Common operations

• Straight and contour cutting
• Drilling/slotting for elements and thermocouples
• Edge chamfers, rebates and step joints

Installation notes

• Dry-fit and mark joints; use step- or shiplap-style seams where possible
• Follow your anchor/fastener layout to limit thermal bridging
• Seal critical joints with compatible high-temp filler where the process allows
• Protect edges during handling; install with expansion allowances

Selecting the right board (what to tell us)

To recommend a grade and construction quickly, share:

1. Operating temperature and peaks
2. Atmosphere (oxidizing/reducing, dust, vapors)
3. Size/thickness and part drawing if custom
4. Target density / mechanical needs (load, velocity)
5. Quantity & destination / required lead time

Fast track: Send the above and we’ll reply with spec + quote in 24 h.

Quality, packaging & export

• ISO-controlled production with batch records (density, thickness, appearance)
• Moisture-proof wrapping, edge protection and wooden crates for export
• Stock samples available; custom prototypes typically within project timelines