High-Temperature Polycrystalline Mullite Fiber Rigid Insulation Board

Product Introduction

High-Temperature Polycrystalline Mullite Fiber Rigid Insulation Board is a high-performance rigid refractory board engineered from sol-gel-derived polycrystalline alumina-silica fibers (Al₂O₃ ≥ 70%), designed for continuous service up to 1600°C with excellent thermal stability and mechanical strength.

 

Featuring an ultra-low thermal conductivity of 0.08–0.19 W/m·K, the board delivers 15–30% energy savings over conventional materials while offering outstanding thermal shock resistance, precise machinability for complex custom shapes, and strong resistance to molten metals and corrosive flue gases.

 

High-Temperature Polycrystalline Mullite Fiber Rigid Insulation Board is widely used in metallurgical ladles and furnaces, petrochemical reformers and cracking heaters, aerospace thermal protection systems, and advanced vacuum or sintering heat-treatment equipment, making it the ideal choice for high-temperature energy-efficient applications.

 

Unique Advantages

① Excellent high temperature stability

② Low thermal conductivity

③ Thermal shock resistance

④ Corrosion resistance

⑤ Easy processing and cutting performance

⑥ Precise thickness and size

⑦ 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

 

What is the thermal stability of polycrystalline mullite fiber?

Polycrystalline mullite fiber is a new type of refractory fiber material. It offers advantages such as high temperature resistance and high mechanical strength. However, many users are still unaware of its thermal stability and are still considering whether it is suitable for their application.

Polycrystalline mullite fiber is the latest high-temperature fiber available domestically and internationally, and is an ultra-lightweight, high-temperature refractory fiber. It belongs to the Al₂O₃-SiO₂ family of ceramic fibers. Its operating temperature is 1500-1700°C, 200-400°C higher than that of glassy fibers. Its thermal stability is unmatched by any other dense or lightweight refractory material.

Polycrystalline mullite fiber products are porous products composed of interwoven fibers with diameters of 2-5 μm. They resist structural stress even under rapid temperature fluctuations, and they do not spall under rapid cooling and heating conditions. They are also resistant to bending, twisting, and mechanical vibration. Therefore, they are not subject to any rapid temperature fluctuations and will not crack, peel, or break after repeated rapid cooling and heating cycles. Refractory fiber products are inherently soft, flexible, and porous materials, so the expansion of individual fibers is absorbed by the fibers themselves.

Therefore, when using polycrystalline mullite fibers, expansion joints and furnace drying issues are completely eliminated. The furnace's steel structure also doesn't need to account for the fiber's expansion stress, resulting in a lighter structure and reduced steel usage.

 

 

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 an experienced manufacturer with our own production base in Zibo, Shandong Province, China, established in 1993. As a directly operated factory, we guarantee competitive pricing and strict quality control, and provide comprehensive pre-sales consultation and after-sales service.

 

Q2: Is this board suitable for chemically aggressive environments?

A2: Yes. Its neutral-to-weakly-alkaline chemistry provides excellent resistance to molten metals, glass melts, and sulfur-bearing or alkaline flue gases. However, for direct contact with acidic slags or hydrofluoric acid environments, additional protective coatings or alternative material selection is advised.

 

Q3: Why is SUNTHERM your best choice?

A3: As an innovative manufacturer and exporter of advanced thermal insulation materials, SUNTHERM is committed to providing:

✓ High-quality Class A non-combustible materials

✓ Eco-friendly solutions with low environmental impact

✓ Body-safe products that meet international standards

✓ Cost-effective performance without compromising quality

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