• Technical Ceramics for the molten non-ferrous industry since 1986 | 40 years of excellence 1986-2026
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  • Copenhagen, Denmark
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Sialon Heater Tubes
  • Sialon & Sintered Silicon Carbide Ceramics
  • Since 1986
Sialon Heater Tube | Silicon Nitride Heater Tubes | Ceramic Heater Tube
silicon nitride heater tube
DSC 4846
DSC 4839
IMG 9491
IMG 9489
sialon alpur heater tubes.v1

Sialon Heater Tubes

Sialon Heater Tubes

Silicon Nitride Tubes for use in in-line degassing boxes such as ALPUR® TS15, TS35, TS55, TS75, TS90, G3 cc Line degasser, SNIF, Hertwich.

We offer a wide range of twenty grades of advanced ceramic silicon nitride and Sialon immersion heater tubes for use in aluminium and non-ferrous molten metal handling industries. Fine silicon nitride and sialon foundry products offer long life and are cost effective compared to competitive materials, such as cast iron and refractory ceramics, such as silicon carbide and aluminium titanate. Sialon is an alloy of silicon nitride and combines excellent thermal and mechanical properties. Sialon has found extensive use in non-ferrous molten metal applications as a result of its high strength, toughness, thermal shock resistance, corrosion resistance and its non–wetting properties in contact with aluminium and its alloys.
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Product Description

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Sialon Heater Tubes for Aluminium Foundries – 20+ Grades, Up to 3 Years Service Life, Non-Wetting Protection for Immersion Heaters.

Sialon ULTRA™ Heater Tubes are the industry-leading immersion heater protection tubes for aluminium and non-ferrous foundries. Manufactured from advanced silicon nitride-based Sialon ceramics (Si₃Al₃O₃N₅), they offer exceptional thermal shock resistance (550–900 °C), non-wetting surfaces, low thermal conductivity and outstanding corrosion/erosion protection – outperforming cast iron, silicon carbide and aluminium titanate by up to 30 % longer life.

Customers routinely achieve 2–3 years of continuous operation with minimal cleaning. Perfect for protecting immersion heaters in ALPUR® TS15/TS35/TS55/TS75/TS90, SNIF®, Hertwich, G3 cc Line in-line degassers and Striko Westofen dosing systems. The unique Sialon composition (partial substitution of silicon by aluminium and nitrogen by oxygen) delivers superior properties compared to pure Si₃N₄, ensuring clean, closed dosing systems that prevent contamination and maintain highest metal purity.

Full technical specifications (ULTRA™ grades 001–004):

  • Bulk density: 3.1–3.3 g/cm³
  • Water absorption: 0 %
  • Flexural strength: 580–1,020 MPa
  • Vickers hardness: 12.7–15.0 GPa
  • Fracture toughness: 4–7 MPa·m¹/²
  • Young’s modulus: 270–300 GPa
  • Coefficient of linear thermal expansion (40–800 °C): 3.2–3.5 ×10⁻⁶/°C
  • Thermal conductivity (20 °C): 23–54 W/(m·K)
  • Heat shock resistance: 550–900 °C
  • Volume resistivity (20 °C): >10¹⁴ Ω·cm

Since 1986, these heater tubes have been the preferred choice for foundries seeking maximum reliability, lowest maintenance and best price/performance ratio. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Heater Tubes – 20+ grades, custom lengths, diameters, flanges and mounting options available. Standard 12-month warranty against chemical attack in molten aluminium.

Material data sheet Sialon (Si3Al3O3N5)

Typical Sialon ULTRA™ grades

 ULTRA-001 ULTRA-002 ULTRA-003 ULTRA-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption ％ 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness （SEPB） MPam1/2 4 ～ 5 6 ～ 7 7 6 ～ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio – 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)
Expansion		 ×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity （20℃） W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance ℃ 550 800 800 900
Volume Resistivity （20℃） Ω・cm >1014 >1014 >1014 >1014

All XICRU Crucibles

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Sialon Heater Tubes for Aluminium Foundries – 20+ Grades, Up to 3 Years Service Life, Non-Wetting Protection for Immersion Heaters.

Sialon ULTRA™ Heater Tubes are the industry-leading immersion heater protection tubes for aluminium and non-ferrous foundries. Manufactured from advanced silicon nitride-based Sialon ceramics (Si₃Al₃O₃N₅), they offer exceptional thermal shock resistance (550–900 °C), non-wetting surfaces, low thermal conductivity and outstanding corrosion/erosion protection – outperforming cast iron, silicon carbide and aluminium titanate by up to 30 % longer life.

Customers routinely achieve 2–3 years of continuous operation with minimal cleaning. Perfect for protecting immersion heaters in ALPUR® TS15/TS35/TS55/TS75/TS90, SNIF®, Hertwich, G3 cc Line in-line degassers and Striko Westofen dosing systems. The unique Sialon composition (partial substitution of silicon by aluminium and nitrogen by oxygen) delivers superior properties compared to pure Si₃N₄, ensuring clean, closed dosing systems that prevent contamination and maintain highest metal purity.

Full technical specifications (ULTRA™ grades 001–004):

  • Bulk density: 3.1–3.3 g/cm³
  • Water absorption: 0 %
  • Flexural strength: 580–1,020 MPa
  • Vickers hardness: 12.7–15.0 GPa
  • Fracture toughness: 4–7 MPa·m¹/²
  • Young’s modulus: 270–300 GPa
  • Coefficient of linear thermal expansion (40–800 °C): 3.2–3.5 ×10⁻⁶/°C
  • Thermal conductivity (20 °C): 23–54 W/(m·K)
  • Heat shock resistance: 550–900 °C
  • Volume resistivity (20 °C): >10¹⁴ Ω·cm

Since 1986, these heater tubes have been the preferred choice for foundries seeking maximum reliability, lowest maintenance and best price/performance ratio. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Heater Tubes – 20+ grades, custom lengths, diameters, flanges and mounting options available. Standard 12-month warranty against chemical attack in molten aluminium.

Material data sheet Sialon (Si3Al3O3N5)

Typical Sialon ULTRA™ grades

 ULTRA-001 ULTRA-002 ULTRA-003 ULTRA-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption ％ 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness （SEPB） MPam1/2 4 ～ 5 6 ～ 7 7 6 ～ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio – 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)
Expansion		 ×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity （20℃） W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance ℃ 550 800 800 900
Volume Resistivity （20℃） Ω・cm >1014 >1014 >1014 >1014

Product Description

loader-icon

Sialon Heater Tubes for Aluminium Foundries – 20+ Grades, Up to 3 Years Service Life, Non-Wetting Protection for Immersion Heaters.

Sialon ULTRA™ Heater Tubes are the industry-leading immersion heater protection tubes for aluminium and non-ferrous foundries. Manufactured from advanced silicon nitride-based Sialon ceramics (Si₃Al₃O₃N₅), they offer exceptional thermal shock resistance (550–900 °C), non-wetting surfaces, low thermal conductivity and outstanding corrosion/erosion protection – outperforming cast iron, silicon carbide and aluminium titanate by up to 30 % longer life.

Customers routinely achieve 2–3 years of continuous operation with minimal cleaning. Perfect for protecting immersion heaters in ALPUR® TS15/TS35/TS55/TS75/TS90, SNIF®, Hertwich, G3 cc Line in-line degassers and Striko Westofen dosing systems. The unique Sialon composition (partial substitution of silicon by aluminium and nitrogen by oxygen) delivers superior properties compared to pure Si₃N₄, ensuring clean, closed dosing systems that prevent contamination and maintain highest metal purity.

Full technical specifications (ULTRA™ grades 001–004):

  • Bulk density: 3.1–3.3 g/cm³
  • Water absorption: 0 %
  • Flexural strength: 580–1,020 MPa
  • Vickers hardness: 12.7–15.0 GPa
  • Fracture toughness: 4–7 MPa·m¹/²
  • Young’s modulus: 270–300 GPa
  • Coefficient of linear thermal expansion (40–800 °C): 3.2–3.5 ×10⁻⁶/°C
  • Thermal conductivity (20 °C): 23–54 W/(m·K)
  • Heat shock resistance: 550–900 °C
  • Volume resistivity (20 °C): >10¹⁴ Ω·cm

Since 1986, these heater tubes have been the preferred choice for foundries seeking maximum reliability, lowest maintenance and best price/performance ratio. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Heater Tubes – 20+ grades, custom lengths, diameters, flanges and mounting options available. Standard 12-month warranty against chemical attack in molten aluminium.

Material data sheet Sialon (Si3Al3O3N5)

Typical Sialon ULTRA™ grades

 ULTRA-001 ULTRA-002 ULTRA-003 ULTRA-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption ％ 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness （SEPB） MPam1/2 4 ～ 5 6 ～ 7 7 6 ～ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio – 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)
Expansion		 ×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity （20℃） W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance ℃ 550 800 800 900
Volume Resistivity （20℃） Ω・cm >1014 >1014 >1014 >1014

XICAR™ Sintered Silicon Carbide Products

loader-icon

Sialon Heater Tubes for Aluminium Foundries – 20+ Grades, Up to 3 Years Service Life, Non-Wetting Protection for Immersion Heaters.

Sialon ULTRA™ Heater Tubes are the industry-leading immersion heater protection tubes for aluminium and non-ferrous foundries. Manufactured from advanced silicon nitride-based Sialon ceramics (Si₃Al₃O₃N₅), they offer exceptional thermal shock resistance (550–900 °C), non-wetting surfaces, low thermal conductivity and outstanding corrosion/erosion protection – outperforming cast iron, silicon carbide and aluminium titanate by up to 30 % longer life.

Customers routinely achieve 2–3 years of continuous operation with minimal cleaning. Perfect for protecting immersion heaters in ALPUR® TS15/TS35/TS55/TS75/TS90, SNIF®, Hertwich, G3 cc Line in-line degassers and Striko Westofen dosing systems. The unique Sialon composition (partial substitution of silicon by aluminium and nitrogen by oxygen) delivers superior properties compared to pure Si₃N₄, ensuring clean, closed dosing systems that prevent contamination and maintain highest metal purity.

Full technical specifications (ULTRA™ grades 001–004):

  • Bulk density: 3.1–3.3 g/cm³
  • Water absorption: 0 %
  • Flexural strength: 580–1,020 MPa
  • Vickers hardness: 12.7–15.0 GPa
  • Fracture toughness: 4–7 MPa·m¹/²
  • Young’s modulus: 270–300 GPa
  • Coefficient of linear thermal expansion (40–800 °C): 3.2–3.5 ×10⁻⁶/°C
  • Thermal conductivity (20 °C): 23–54 W/(m·K)
  • Heat shock resistance: 550–900 °C
  • Volume resistivity (20 °C): >10¹⁴ Ω·cm

Since 1986, these heater tubes have been the preferred choice for foundries seeking maximum reliability, lowest maintenance and best price/performance ratio. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Heater Tubes – 20+ grades, custom lengths, diameters, flanges and mounting options available. Standard 12-month warranty against chemical attack in molten aluminium.

Material data sheet Sialon (Si3Al3O3N5)

Typical Sialon ULTRA™ grades

 ULTRA-001 ULTRA-002 ULTRA-003 ULTRA-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption ％ 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness （SEPB） MPam1/2 4 ～ 5 6 ～ 7 7 6 ～ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio – 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)
Expansion		 ×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity （20℃） W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance ℃ 550 800 800 900
Volume Resistivity （20℃） Ω・cm >1014 >1014 >1014 >1014

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Why Us?

Reasonable delivery times

We ship usually within 4 weeks

12 months warranty

In molten aluminium baths

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Since 1986

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Technical Ceramics since 1986

Sialon Products

XICAR™ Sintered Silicon Carbide

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+(46) 31 754 0790

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+(45) 35 15 8085

USA/Canada Tollfree

+ 1 (833) 709-1399

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