Gold Member Since 2014
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Shanghai Gongtao Ceramics Co., Ltd.

Alumina Blind Tube, Aluminium Oxide Protection Tube, Al2O3 Protection Tube manufacturer / supplier in China, offering Alumina 99.5% Protection Tubes One Side Closed for Thermocouples, High Quality Stainless Steel Pot for Grinding Jar, High Temperature Long Life Alsint 99.7% Alumina Ceramic Tube for Thermocouple Protection and so on.

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Supplier Homepage Product Ceramic tube Others Ceramic tube Alumina 99.5% Protection Tubes One Side Closed for Thermocouples

Alumina 99.5% Protection Tubes One Side Closed for Thermocouples

FOB Price: US $1 / Piece
Min. Order: 2 Pieces
Min. Order FOB Price
2 Pieces US $1/ Piece
Get Latest Price
Production Capacity: 500000 PCS Per Year
Transport Package: Plywood Case
Payment Terms: L/C, T/T, Money Gram, Western Union

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Basic Info
  • Model NO.: GT-208
  • Feature: Long Time Materials
  • Shape: Pipe
  • Alumina: Sillimatin 60 C 530, Alsint 99.7 C 799
  • Color: White, Pink Cream
  • Application: High Temperature Resistant, High Wear Resistance
  • Trademark: shangtao
  • Origin: Shanghai, China
  • Refractoriness (℃): Refractoriness> 2000
  • Type: Heat-Resistant Material
  • Material: Alumina
  • Size: Od 8-50
  • End: Oec or Beo
  • Finish: Collar, Slot, Curve
  • Specification: Rohs
  • HS Code: 8547100000
Product Description
Gongtao company mainly produce alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containig vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.


Sillimatin 60 Type C 530, Alsint 99.7 Type C 799 and Pythagoras Type C 610, all complying with DIN VDE 0335.
The main applications are in the area of thermal processes. Protection tubes, insulators, radiant tubes, support tubes for electric heaters, beams, profiles, incineration aids and special fabrications.
The Impervious Materials are:
Alsint(Re-crystallised Alumina) is rated to 1700oC
Pythagoras(Aluminous Porcelain) is rated to 1400oC
The Porous Material is:
Sillimantin 60 and is rated at 1350oC
Sillimantin has better thermal shock resistance and is used mainly in furnace tubes, however can be used as an outer protection sheath if thermal shock is critical.

Our items are various and exported to many countries. Welcome to contact us!
DimensionOuter dia. mmInner dia.mmLength mmRemark
Item 
Thermocouple protection tube7-1201-11010-2000
If you need others,we can

customize for you.
Insulated tubeSingle hole2-1201-11010-2000
(inner core)Double holes1-100.4-210-2000

Four holes2-100.5-210-2000

Property of material:
Material85 Al2o390 Al2o395 Al2o399 Al2o3
Al2o385%90%93%99.30%
Fe2o3≤ 1.0≤ 0.5≤ 0.5≤ 0.3
Desnsity: g / cm33.43.53.63.85
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

FeatureApplicationMain usage
1.Great mechanical strength
Electric appliance industry                                     

Automotive industry

1.Heat treatment furnace 

and toughened furnace
2.High softening temperature
3.Good resistance to thermal impact
4.Small thermal expansion coefficient 
Mechanical industry              

Engineer industry 

2.Inner liner tube and heating

 tube in electric furnace
5.Good chill and abrupt heat properties
6. Resistance to acid and alkali corrosion

99.7%,99%,95% alumina ceramic tube
OD mmID mmL mm
640-2500
850-2500
106-70-2500
128-90-2500
149-100-2500
1510-110-2500
1610-120-2500
1712-130-2500
1813-140-2500
2014-150-2500
2518-200-2500
2619-210-2500
3020-230-2500
3222-250-2500
3525-270-2500
3830-320-2500
4030-340-2500
4535-380-2500
5040-440-2500
5545-480-2500
6050-540-2500
6555-580-2500
7060-640-2500
7565-680-2500
8070-740-2500
8575-780-2500
9080-840-2500
9585-880-2500
10090-930-2500
10595-980-2500
110100-1020-2500
115105-1080-2500
120110-1020-2500
150140-1410-1200

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