Ceramic Fiber Custom ODM Solutions from China Manufacturer

Ceramic fiber, also known as alumina-silica fiber, is a synthetic, lightweight, high-temperature insulation material composed primarily of alumina (Al2O3) and silica (SiO2). It is manufactured by melting a blend of high-purity alumina and silica materials and then spinning or blowing the molten stream to create a wool-like mass of fine, interlocked fibers. This unique structure endows ceramic fiber with exceptional thermal properties, making it indispensable in industries where extreme heat management is critical. Unlike traditional refractory bricks, ceramic fiber offers lower thermal conductivity, reduced heat storage, and superior thermal shock resistance, leading to enhanced energy efficiency and faster cycle times in industrial furnaces and kilns. **Primary Characteristics and Advantages:** * **High-Temperature Stability:** Capable of continuous operation from 1260°C (2300°F) to 1600°C (2912°F), depending on the grade and purity. * **Low Thermal Conductivity:** Excellent insulating properties minimize heat loss, conserving energy and improving process efficiency. * **Low Heat Storage:** Requires less energy to heat up and cool down compared to dense refractories, allowing for rapid thermal cycling. * **Excellent Thermal Shock Resistance:** Withstands rapid temperature changes without cracking or spalling. * **Lightweight:** Significantly lighter than brick or castable refractories, reducing structural support requirements. * **Chemical Stability:** Resists attack from most corrosive agents, except hydrofluoric acid, phosphoric acid, and strong alkalies. * **Flexibility and Ease of Installation:** Available in various forms (blanket, board, module, paper, felt) for versatile application. ### Detailed Product Parameters and Specifications To select the correct ceramic fiber product for your application, understanding the technical specifications is paramount. Below are detailed parameters for common ceramic fiber forms. **1. Ceramic Fiber Blanket** The most common form, used for lining furnaces, boilers, and for expansion joint sealing.

Property	Standard Grade (1260°C)	High-Purity Grade (1400°C)	Zirconia Grade (1600°C)	Test Method
Classification Temperature	1260°C (2300°F)	1400°C (2552°F)	1600°C (2912°F)	ASTM C892
Continuous Use Limit	~1100°C (2012°F)	~1260°C (2300°F)	~1430°C (2606°F)	-
Density (Typical)	64, 96, 128 kg/m³	96, 128 kg/m³	128 kg/m³	ASTM C167
Thermal Conductivity (Hot Face 1000°C)	0.24 W/m·K	0.22 W/m·K	0.20 W/m·K	ASTM C201
Linear Shrinkage (24h at Max Temp)	<3.5% @ 1260°C	<3.0% @ 1400°C	<2.5% @ 1600°C	ASTM C356
Tensile Strength	>100 kPa	>120 kPa	>150 kPa	ASTM C1335
Chemical Composition (Al2O3)	44-48%	52-56%	37-41% (with 15-18% ZrO2)	XRF Analysis

**2. Ceramic Fiber Board** Rigid boards offer superior resistance to erosion and airflow, ideal for hearths, burner blocks, and high-wear areas.

Property	Standard Board	High-Temp Board	Vacuum-Formed Board
Classification Temperature	1260°C (2300°F)	1430°C (2606°F)	1260-1430°C
Density Range	260-320 kg/m³	280-350 kg/m³	280-400 kg/m³
Cold Crushing Strength	0.8 - 1.5 MPa	1.5 - 3.0 MPa	2.0 - 5.0 MPa
Thermal Conductivity @ 800°C	0.18 W/m·K	0.16 W/m·K	0.15 W/m·K
Linear Shrinkage	<2.0% @ 1260°C	<1.5% @ 1430°C	<1.0% @ 1400°C
Standard Sizes (mm)	1200x1000, 1200x600	1200x1000, 1200x600	Customizable
Thickness Range (mm)	10-100 mm	10-75 mm	6-50 mm

**3. Ceramic Fiber Modules** Pre-fabricated units for fast lining installation, featuring folded blanket anchored to a metal plate. * **Construction:** Folded or layered blanket, needled for integrity, with alloy anchors. * **Standard Sizes:** 300x300 mm, 300x600 mm face dimensions. Thickness: 150mm to 500mm. * **Density:** 200-220 kg/m³ (packed density). * **Anchor Types:** 304, 310, or 330 stainless steel, Inconel for very high temps. * **Installation Speed:** Drastically faster than blanket layering; reduces labor costs. * **Performance:** Uniform insulation, reduced heat loss through seams. **Key Selection Parameters Summary:** * **Maximum Operating Temperature:** Always choose a grade with a classification temperature exceeding your process temperature. * **Thermal Conductivity:** Lower values provide better insulation. Density and temperature affect this value. * **Hot Strength & Erosion Resistance:** Boards and vacuum-formed shapes outperform blankets in high-velocity gas environments. * **Chemical Environment:** Check compatibility with process atmospheres (e.g., hydrogen, carbon monoxide, sulfur). * **Physical Requirements:** Consider need for flexibility (blanket), rigidity (board), or pre-formed shapes. ### Ceramic Fiber FAQ (Frequently Asked Questions) What is the key difference between ceramic fiber blanket, board, and module? The key difference lies in form, density, and application. Blankets are flexible, low-density rolls used for lining walls and roofs. Boards are rigid, high-density panels used for surfaces requiring mechanical strength and erosion resistance. Modules are pre-assembled blocks of folded blanket with an anchoring system, designed for quick and uniform furnace lining installation with minimal seams. How do I determine the right temperature grade for my application? Always select a ceramic fiber product whose **classification temperature** is at least 100-150°C above your maximum continuous operating temperature. For instance, if your process runs at 1150°C continuously, a 1400°C grade is recommended. Using a product at temperatures too close to its limit will cause excessive shrinkage and degrade its lifespan. Consider peak temperatures during startups or malfunctions as well. Is ceramic fiber safe to handle? What health precautions are necessary? Fresh, untreated ceramic fiber is classified as a "possible human carcinogen" (IARC Group 2B) due to its bio-persistent fibrous nature. During handling, cutting, or installation, fibers can become airborne and pose a respiratory hazard. It is **imperative** to use appropriate Personal Protective Equipment (PPE): a NIOSH-approved respirator (P100 filter), safety goggles, gloves, and long-sleeved clothing. Always follow OSHA or local safety guidelines. Engineered products with binders or coatings that reduce dust are available. Once installed and heated, the fibers sinter together, significantly reducing the friability risk. Can ceramic fiber be used in contact with flames or high-velocity gases? Standard ceramic fiber blankets are not suitable for direct flame impingement or high-velocity gas streams, as the fibers can be eroded and carried away. For such applications, you must use rigidized surfaces. This can be achieved by applying a refractory coating or wash on the fiber surface, using high-density fiber boards, or using vacuum-formed shapes with higher erosion resistance. Always specify the need for flame or gas contact to your supplier. How is ceramic fiber installed in an industrial furnace? Installation method depends on the product form. **Blankets** are typically layered and secured with metal anchors (washer and stud system) onto the furnace shell. **Modules** are bolted directly to the steel shell via their pre-welded anchor plates, creating a uniform lining quickly. **Boards** are cut to size and secured using a combination of adhesives and mechanical anchors. Proper compression and seam staggering are critical for all methods to prevent heat leakage. It is highly advised to follow the manufacturer's installation guidelines. What causes ceramic fiber to shrink, and how is it accounted for in design? Shrinkage occurs due to the conversion of the amorphous fiber to crystalline phases (multite, cristobalite) at high temperatures, causing densification. Higher temperatures and longer exposure increase shrinkage. Reputable manufacturers provide shrinkage data (like in the tables above) from standardized tests. Engineers account for this by designing overlaps in blanket installations, allowing for compression in modules, and specifying a higher grade than the minimum required. Properly selected and installed fiber should have minimal, predictable shrinkage that does not compromise the lining integrity. How does the thermal conductivity of ceramic fiber change with temperature and density? Thermal conductivity of ceramic fiber **increases** with rising temperature. However, it remains significantly lower than dense refractories across the entire temperature range. Increasing the product's density generally lowers its thermal conductivity up to an optimal point, as it reduces radiant heat transfer through the pores. Beyond that point, increased solid conduction can cause conductivity to rise again. Manufacturers provide conductivity vs. mean temperature charts for precise engineering calculations. What are the main chemical compatibility concerns for ceramic fiber? Ceramic fiber exhibits good resistance to most acids and oxidizing atmospheres. Its primary vulnerabilities are to: * **Hydrofluoric Acid (HF) and Phosphoric Acid:** These will aggressively attack the silica component. * **Strong Alkalis (e.g., Caustic Soda, Potash):** These attack the alumina component, especially at high temperatures. * **Volatile Alkali Metal Compounds (V2O5, etc.):** Present in some fuel ashes, they can flux the fiber surface, lowering its melting point. In such environments, alternative high-alumina or pure alumina fibers may be required. Always conduct a chemical compatibility review for your specific process atmosphere. Can ceramic fiber be wetted or used in humid environments? While the fibers themselves are not hygroscopic, the large surface area of the wool can absorb moisture from the air. This is generally not a structural problem, as the water will evaporate upon first heat-up. However, during installation, wet fiber is difficult to handle and may require extended dry-out times. For applications where the lining will be exposed to humidity before use, storing materials in a dry place and using temporary covers is recommended. Some fiber products come with water-repellent additives.