Rigid Polycrystalline Mullite Fiber Insulation Board

Product Introduction

Made from high-purity polycrystalline alumina-silica fibers (with an Al₂O₃ content of 70% or higher) derived from a sol-gel manufacturing route, this rigid insulation board features a refined microcrystalline framework that delivers exceptional performance in extreme thermal environments. Produced using advanced, purpose-built equipment, it reliably endures sustained service temperatures reaching up to 1600°C, backed by outstanding heat resistance and long-term structural integrity.

 

With a notably low thermal conduction rate of just 0.15–0.25 W/m·K, 1700C Polycrystalline Mullite Fiber Board ensures minimized energy loss while offering robust defense against thermal cycling, corrosive media, and mechanical stress. Its superior shape retention under prolonged heating, combined with excellent workability for precision cutting and forming, makes it highly adaptable to a broad spectrum of demanding applications. Key usage areas include metallurgical operations (such as ladle linings and furnace systems), petrochemical processing (including reformer and cracking units), aerospace thermal shielding, and advanced heat-treatment facilities like vacuum and sintering furnaces. 1700C

 

Polycrystalline Mullite Fiber Board stands out as a reliable, cost-effective, and energy-conscious choice for high-temperature insulation requirements.

 

Unique Advantages

01. Excellent high temperature stability

02. Low thermal conductivity

03. Thermal shock resistance

04. Corrosion resistance

05. Easy processing and cutting performance

06. Precise thickness and size

07. Good resistance to flame and air erosion

 

Product Application

Back linings for high-temperature kilns and furnaces

Hot face insulation for sintering and calcining equipment

Thermal insulation components in gas turbines and aerospace devices

Customized refractory shapes for high-temperature sealing and protection

 

Product Parameter

Item		Index
Classification temperature(C)		1600	1700
Use limit(C)		1450	1600
Al2O3(%)		62	70
Al2O3+SiO2 (%)		98	98.5
Density(Kg/m3)		250-600	250-600
Thermal conductivity (W/m.k)	400C	0.08	0.08
	600C	0.10	0.09
	800C	0.13	0.12
	1000C	0.15	0.15
	1200C	0.19	0.19
Linear shrinkage (%)		≤2 (1450Cx24h)	≤1.5 (1600Cx24h)
Modules of rupture (Mpa)		≥0.3	≥0.3
Compressive strength (Mpa)		≥0.25	≥0.25
Ignition loss(%)		8	8

 

How stable is polycrystalline mullite fiber under high temperatures?

As an advanced refractory fiber developed in recent years, polycrystalline mullite fiber stands out for its impressive heat resistance and high strength. Still, many customers have questions about its thermal stability and hesitate before deciding whether it fits their specific processes.

 

This material is recognized as one of the most cutting-edge high-temperature fibers currently available worldwide. As an ultra-lightweight ceramic fiber belonging to the Al₂O₃-SiO₂ series, it performs reliably between 1500°C and 1700°C-a range that exceeds traditional glassy fibers by roughly 200 to 400 degrees Celsius. In fact, no other dense or lightweight refractory can match its level of thermal stability.

 

The fiber products feature a highly porous structure formed by randomly interlocked filaments just 2 to 5 micrometers thick. This architecture enables them to endure drastic temperature changes without developing internal stress fractures. They remain intact under rapid heating and cooling, and show strong resistance to mechanical stresses such as bending, twisting, and vibration. As a result, they do not crack, delaminate, or rupture even after many sharp thermal cycles. Since refractory fiber products are inherently soft, flexible, and porous, any minor thermal expansion occurring within individual fibers is naturally absorbed by the material's internal voids and flexible matrix.

 

Thanks to this inherent flexibility and self-accommodating nature, expansion joints and preheating drying procedures are no longer necessary when installing polycrystalline mullite fiber linings. Moreover, the furnace's steel shell does not need to be designed to accommodate thermal expansion forces from the refractory layer, allowing for a more lightweight structural framework and reduced steel consumption.

 

 

Product Certificate

 

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Packaging Display

 

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FAQ

Q1: Are you a manufacturer or a trading company?

A1: We are a direct manufacturer with our own production facility located in Zibo, Shandong Province, China. Since our founding in 1993, we have built decades of experience in the refractory industry. As a factory-direct supplier, we offer competitive pricing, rigorous in-house quality control, and comprehensive support ranging from pre-sales technical consultation to after-sales service.

 

Q2: Why choose SUNTHERM as your thermal insulation partner?

A2: As both an innovative manufacturer and experienced exporter of advanced high-temperature insulation materials, SUNTHERM is dedicated to delivering:

✓ Premium Class A non-combustible materials for maximum safety

✓ Environmentally responsible solutions that minimize ecological impact

✓ Body-friendly products compliant with stringent international health standards

✓ Exceptional value with high performance at competitive costs

Backed by deep technical expertise and a strong customer-first philosophy, we are fully equipped to provide the ideal insulation solution tailored to your specific operational requirements.

 

Q3: What is the typical lead time for your products?

A3: Our standard lead time is generally 7 to 20 working days after order confirmation, depending on the product type and order quantity. For urgent requirements, we can also expedite production upon request. We always strive to balance speed with quality to ensure your project stays on schedule without compromising product performance.

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