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Glazed Ignition Electrode Alumina Ceramic Tube Alumina Ceramic Spark Electrode

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Glazed Ignition Electrode Alumina Ceramic Tube Alumina Ceramic Spark Electrode

Country/Region china
City & Province dongguan guangdong
Categories Auto Engine

Product Details



Glazed Ignition Electrode Alumina Ceramic Tube Alumina Ceramic Spark Electrode for Ignition Device


The ceramic spark ignition rods are widely used in ignition devise of combustion machine, boiler, with strong points such as sensitive ignition, durable, strong ageing resistance, high temperature resistance, corrosion resistance, high dielectric strength. Standard interface thread is M14× 1.25, M16 × 1.5, M18 × 1.5, G1/2. Ignition electrode needle is Φ 2.6 Φ 3Φ 5 and Φ 3.5. The electrode needle length can be produced according to customer requirements, the ceramic parts of electrode needle can be assembled according to the different requirements of customers.

Ceramic ignition/ induction probe

Characteristics: Aging and high temperature resistance, perfect insulation, high strength, good stability, suitable for different environment.
Technical parameter: 0.5 to 1.5mm in diameter, length of 50- 80mm, insulation strength>15KV/mm.
Applications: All kinds of pipeline gas, liquefied petroleum gas, natural gas and electrical water heater, stove, gas oven ect with similar purpose.


Material85 Al2o390 Al2o395 Al2o399 Al2o3
Fe2o3≤ 1.0≤ 0.5≤ 0.5≤ 0.3
Desnsity: g / cm33.
Vickers Hardness≥ 8.6≥ 8.899
Water Absorption:%≤ 0.2≤ 0.1≤ 0.085≤ 0.01
Refractoriness:°C1580 °C1600 °C1650 °C1800°C
Flexural Strength:Mpa180200240280
Wear Rate( at room temperature,
erosion, 100 grinding)%
≤ 3≤ 2.5≤ 1≤ 0.5


The protection sheath is mainly used for the protection of thermocouple sensor and making the sensor isolated with the outside environment. It can effectively prevent the element from being eroded, oxidized and broken.


Product Name
High Purity One End Closed 99.5% Alumina Ceramic Tube 99% Al2o3 Pipe
95%, 99%, 99.5% and 99.7% Alumina
DIN 40680-1, DIN 40680-2; DIN EN 60672-1, DIN EN 60672-2, DIN EN 60672-3.
Thermal resistance/ Wear resistance/ Stable Chemical Performance/ Corrosion resistance/ Electrical insulation, High compressive strength


Mingrui  alumina tubes are 99.5% to 99.8% high purity and offer elevated temperature stability. Alumina tubes are available in custom sizes, including American and Metric, and offer a low material cost.

Minerals containing alumina make up nearly 15% of the earth’s crust. This makes it practically inexhaustible and versatile. Alumina provides the combination of low thermal expansion, superior thermal conductivity and high compressive strength making it thermal shock resistant and the ideal product for alumina tubes. Our alumina tube models have elevated dielectric properties and are gas tight providing a higher vacuum or protective atmosphere when at an extreme temperature.

These alumina tubes offer:

  • Extreme high temperature stability under reducing, inert and high vacuum condition under high temperature up to 1800°C.
  • Extreme wear and abrasion resistance.
  • Chemical corrosion resistance under high temperature.
  • High dielectric properties.
  • Gas tight for many applications to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity.
  • Low material cost and custom size available.
  • Available Tube Diameter From 3/16″ to 9″ for American size and 2 mm to 150 mm.
  • Available Tube Length: From 1″ ( 25mm) To 72″ ( 1828mm).
  • Most items are in Stock and can be delivered in 1-3 days.
  • Sentro Tech also offer volume discount for all listed sizes if order quantity is more than 5 pieces for same size.

Typical Physical Properties of Alumina Tubes

Composition99.80% AL2O399.5% AL2O3
Bulk Specific Gravity (g/cc)3.93.8
ImpenetrabilityGas TightGas Tight
Dye Penetration A.S.T.M.TightTight
Flexural Strength (psi)70,00050,000
Compressive Strength (psi)370,000350,000
Tensile Strength (psi)43,00033,000
Maximum Working Temperature1800°C1750°C
Likely Sag Temp. Unsupported Tube*1600 oC1600 oC
Thermal Conductivity 24oC230200
(BTU-in/ft2-hr-oF) 800oC6050
Dielectric Strength 24oC V/Mil300270
Thermal Expansion (per oC x 10-6)88.4
(24oC-1000 oC)  
Hardness (Moh’s scale)99
* Temperature at which an empty tube, 1 1/4″ diameter, suspended across an 18″ span, will sag 1/4″ in 1 hour.
Where sag is not acceptable, tubes must be adequately supported along the full length.
FAQ : 
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 35-50 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact us as below:



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