Protection Tube

When the dust in the flue gas is too large, the metal protective tube of the probe is easily damaged. You can choose to add a ceramic protective tube to the metal tube to resist dust erosion. Effectively protect the probe and prolong the service life of the probe.

protection tube

Material Properties

ltem Unit 99.7% AI2O3 99% AI2O3 95% AI2O3
Purity % 99.7 99 95
Density g/cm3 3.9 3.89 3.6
Porosity % 0 0 0
Firing Temp 1800 1700 1 680
Hardness HV 1700 1600 1500
Flexural Strength Kgf/cm2 3500 3500 3000
Compressive Strength Kgf/cm2 30000 30000 25000
Fracture Toughness MPa/m 4 3.8 3~4
Max Operating Temp 1700 1600 1450
Coefficient cm/cm/°C 8 8 8
Thermal Expansion (RT to 700ᵒC)
Thermal Conductivity W/m°K 27 25 22
Volume Resistivity 20°C 1012 1012 1012
100°C 1013 1013 1013
300°C 1012~1013 1012~ 1013 1012~1013
(ohm – cm) 1010 1012 1012 1010
Dielectric Strength Volts/mil 220 216 210

Fluidized furnace
Circulating fluidized bed boiler
Cement rotary kiln tail smoke chamber
Ball mill
Fan mill
Coal mill


Good stability
Easy to clean
Impact resistance


Fluidized Furnace

fluidized furnace ceramics

Ball Mill

ball mill ceramics

Impact Pulverizer

Impact pulverizer ceramics


Can you provide samples for me to test? How much does it cost?

We strive to provide ceramic samples that closely meet your requirements to the best of our abilities.
The samples are completely free, but you need to pay the freight.
For samples with unique shapes that require custom molds, we are open to discussing the mold cost in order to accommodate your specific needs.

We don’t know which material of ceramic we need, what should we do?

No worries! Please provide us with more details about your requirements, such as the intended use, desired properties, and any specific characteristics you're looking for.

With these information, our team can guide you in selecting the most suitable ceramic material for your needs.

We are concerned about the quality of the product we ordered.

We understand your worries and we maintain stringent quality control standards as following:

Test Standard Testing Dimension Pass Rate Standard Range
Appearance Inspection Quantity and Severity of Defects ≥ 97.3% Determined by AQL standard
Dimensional Inspection Size Accuracy and Consistency ≥ 98.1% Determined by ISO 9001 standard
Density Testing Material Density ≥ 97% Determined by ASTM C20 standard
Hardness Testing Surface Hardness ≥ 98.2% Determined by ISO 6508 standard
Flexural Strength Testing Material Flexural Strength ≥ 97.9% Determined by ASTM C1161 standard
Thermal Shock Stability Testing Material Thermal Shock Stability ≥ 98.7% Determined by ASTM C884 standard

*Qualification standards higher than ISO standards

In addition to production line inspections, we also accept inspections from third-party organizations several times a month

While the occurrence of defects is extremely rare, it is an unavoidable possibility. If any quality issues arise, we take full responsibility and will expedite the reproduction process at cost price.

Our commitment is to ensure that our products meet the highest quality standards and promptly address any concerns to ensure customer satisfaction.

What is the processing accuracy of ceramics?

Precision Requirement Example Unit
Surface Flatness Ra ≤ 0.1 μm μm
Dimensional Accuracy Tolerance within tens of μm μm
Aperture Precision Diameter tolerance within a few hundred μm μm
Surface Finish Ra ≤ 0.2 μm μm

We maintain strict processing precision standards, ensuring that our products meet the majority of requirements using our standard manufacturing processes.

However, if you have a need for even higher precision products, please feel free to contact us.

We can discuss your specific requirements and explore customized solutions to meet your exacting standards.

What's your trade terms?

We prefer EXW, FOB and CIF as for terms.
T/T, West Union,30% deposit, 70% balance paid before delivery are greatly appreciated.

How long does your production take?

Q: What is the typical production lead time for Vhandy Ceramics?
A: The typical production lead time for Vhandy Ceramics is 15 to 20 days.

Q: Are there any situations where the actual delivery time may be longer?
A: Yes, in certain cases, such as shipping to distant countries, the actual delivery time may be extended beyond the standard range.

Q: What factors can contribute to longer delivery times?
A: Factors such as customs clearance procedures, transportation logistics, and international shipping arrangements can contribute to longer delivery times.

Q: How does Vhandy Ceramics handle potential delays?
A: Vhandy Ceramics strives to minimize potential delays and works closely with shipping partners to expedite the process whenever possible.

Q: Can I get an accurate delivery estimate for my order?
A: Yes, our customer service team can provide you with an estimated delivery time based on your specific order and location. They will also keep you informed throughout the production and shipping process.


*Your contact won’t be shared with 3rd party.

    Shenyang Vhandy Technology Co., Ltd.

    Room 401, D11 Block (Shenyang International Software Park), Shenyang, Liaoning, China



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