Thermal Insulation Polycrystalline Mullite Fiber Board

Product Introduction

Thermal insulation polycrystalline mullite fiber board is a high-performance refractory thermal insulation material made from polycrystalline alumina-silica fibers (Al₂O₃ ≥ 70%) produced by a sol-gel process. It exhibits a unique microcrystalline structure. Manufactured on a modern, specialized production line, this product can operate at temperatures up to 1600°C, combining excellent high-temperature resistance and thermal stability.

 

Thermal insulation polycrystalline mullite fiber board exhibits extremely low thermal conductivity (0.15-0.25 W/m·K), excellent thermal shock and chemical resistance, excellent dimensional stability, and strong machinability. It is widely used in the metallurgical industry (such as ladles and heating furnaces), petrochemical energy (cracking furnaces and reforming furnaces), aerospace (thermal protection systems), and heat treatment equipment (vacuum furnaces and sintering furnaces). It is an ideal, energy-efficient thermal insulation solution for high-temperature environments.

 

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

 

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

 

Customer visits

 

 

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: What products do you specialize in?

A2: We produce a full range of high-performance refractory and insulation materials, including:

• Ceramic fiber products

• Inorganic fiber products

• Bio-soluble fiber products

• Microporous insulation boards

• Insulating refractory bricks

• Calcium silicate products

• Rock wool insulation materials

• Production lines

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

 

With our technical expertise and customer-centric approach, we ensure you receive the optimal thermal insulation solution for your specific application.

 

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