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
Technical parameter: 0.5 to 1.5mm in diameter, length of 50- 80mm,
Applications: All kinds of pipeline gas, liquefied petroleum gas,
natural gas and electrical water heater, stove, gas oven ect with
|Material||85 Al2o3||90 Al2o3||95 Al2o3||99 Al2o3|
|Fe2o3||≤ 1.0||≤ 0.5||≤ 0.5||≤ 0.3|
|Desnsity: g / cm3||3.4||3.5||3.6||3.85|
|Vickers Hardness||≥ 8.6||≥ 8.8||9||9|
|Water Absorption:%||≤ 0.2||≤ 0.1||≤ 0.085||≤ 0.01|
|Refractoriness:°C||1580 °C||1600 °C||1650 °C||1800°C|
|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.
|High Purity One End Closed 99.5% Alumina Ceramic Tube 99% Al2o3
95%, 99%, 99.5% and 99.7% Alumina
DIN 40680-1, DIN 40680-2; DIN EN 60672-1, DIN EN 60672-2, DIN EN
Thermal resistance/ Wear resistance/ Stable Chemical Performance/
Corrosion resistance/ Electrical insulation, High compressive
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
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
- 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
|Composition||99.80% AL2O3||99.5% AL2O3|
|Bulk Specific Gravity (g/cc)||3.9||3.8|
|Impenetrability||Gas Tight||Gas Tight|
|Dye Penetration A.S.T.M.||Tight||Tight|
|Flexural Strength (psi)||70,000||50,000|
|Compressive Strength (psi)||370,000||350,000|
|Tensile Strength (psi)||43,000||33,000|
|Maximum Working Temperature||1800°C||1750°C|
|Likely Sag Temp. Unsupported Tube*||1600 oC||1600 oC|
|Thermal Conductivity 24oC||230||200|
|Dielectric Strength 24oC V/Mil||300||270|
|Thermal Expansion (per oC x 10-6)||8||8.4|
|(24oC-1000 oC)|| || |
|Hardness (Moh’s scale)||9||9|
|* 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.|
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
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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