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CM2251 Mullite Tube, Silicate Ceramic Tube

Name: CM2251 Mullite Tube, Silicate Ceramic Tube
Brand: Advanced Ceramic Materials
SKU: CM2251
Availability: InStock
Rating: 4.9 (166 reviews)

Catalog No. CM2251
Material Mullite (3Al₂O₃·2SiO₂)
Color Off-white
Form Tube
Max Working Temp. 1650°C (no load)
Density 2.8 g/cm³
Thermal Conductivity 6 W/m·K
Dielectric Strength 9.8 ac-kv/mm

Datasheet

Inquiry

CM2251 Mullite Tube, Silicate Ceramic Tube

Advanced Ceramic Materials (ACM) supplies high-quality mullite tubes (3Al₂O₃·2SiO₂) with max working temperature 1650°C, density 2.8 g/cm³, and flexural strength 180 MPa. Mullite offers low thermal expansion (5.4×10⁻⁶/°C), high dielectric strength (9.8 ac-kv/mm), and good thermal shock resistance. Used as thermocouple protection tubes, furnace components, heating element insulators, and electrical insulation in high-temperature applications. Custom OD, ID, and lengths available. Contact us for current pricing and availability.

Mullite Tube Specifications

Chemistry Content of Mullite Tube
Al2O3	SiO2	TiO2	Fe2O3	CaO·MgO	K2ONa2O and others
62.50%	34.50%	0.10%	0.80%	0.90%	1.30%

Mechanical Properties

Property	Units	Value
Density	gm/cc	2.8
Porosity	%	0
Flexural Strength	MPa	180
Elastic Modulus	GPa	151
Compressive Strength	MPa	1310
Hardness	Kg/mm²	1070
Fracture Toughness KIC	MPa·m¹/²	2
Maximum Use Temperature (no load)	°C	1650

Thermal Properties

Property	Units	Value
Thermal Conductivity	W/m·K	6
Coefficient of Thermal Expansion	10⁻⁶/°C	5.4

Electrical Properties

Property	Units	Value
Dielectric Strength	ac-kv/mm	9.8
Dielectric Constant (@ 1 MHz)	-	5.8
Dissipation Factor (@ 1 kHz)	-	0.003
Volume Resistivity	ohm·cm	>10¹³

Key Features and Benefits

High Thermal Stability: Can withstand high temperatures up to 1650°C.
Excellent Mechanical Strength: High compressive and flexural strength.
Low Thermal Expansion: Reduces the risk of thermal shock.
High Dielectric Strength: Ideal for electrical insulation applications.
Cost-Effective: Raw materials are affordable and readily available.

Applications

Thermocouple Protection Tubes
Protect thermocouples in high-temperature furnaces and kilns up to 1650°C.

Furnace Components
Used as heating element support rods, insulator tubes, and structural components in high-temperature processing equipment.

Electrical Insulation
High dielectric strength (9.8 ac-kv/mm) and volume resistivity (>10¹³ ohm·cm) for insulating heating element lead wires and high-voltage components.

Heat Exchangers & Thermal Processing
Low thermal expansion and good thermal shock resistance for thermal cycling applications.

Semiconductor & Electronics
Used in diffusion furnaces and other high-temperature semiconductor manufacturing processes.

Laboratory & R&D
Sample holders, reaction tubes, and custom labware for high-temperature experiments.

Packaging and Quality Assurance

ACM’s Mullite Tubes are carefully handled to minimize damage during storage and transportation, ensuring the products remain in their original high-quality condition.

Frequently Asked Questions (FAQs)

Q: What is the maximum operating temperature?
A: 1650°C (no load). Continuous working temperature: 1500-1550°C recommended for extended tube life.

Q: What OD/ID sizes are available?
A: Custom sizes available. Standard options range from ~0.8mm OD to 76mm OD. Contact us with your specific OD, ID, and length requirements.

Q: Can you provide custom lengths?
A: Yes. Custom lengths up to 1500mm (60") available upon request.

Q: What is the material composition?
A: 3Al₂O₃·2SiO₂ (62.5% Al₂O₃, 34.5% SiO₂) with minor impurities.