Refractory Alumina Ceramic Tube

Furnace work tubes and thermocouple protection tubes rated to 1650°C.

machinery
electronics
chemicals
petroleum

Refractory Alumina Ceramic Tube specification
Color	White, pink
Density	3.85 g/cm3
MONS' Hardness	Grade 9
Maximum Use Temperature	1650°C

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Overview

Ceramic alumina tube widely used in highly corrosive and high-temperature environments like thermal power. We can supply the products according to the customer's drawings, dimension and performance requirement.

Key Benefits

High hardness
High strength
Wear resistance
Corrosion resistance
High temperature resistance of 1600 degrees
Good heat dissipation
Good insulation performance
High cost performance

Problems It Solves

Metal supports creep and short out once an element runs hot enough to be useful.
Acid and alkali attack metal wetted parts and contaminate the process stream.

Application Scenarios

Kiln furniture
Furnace work tubes
Vacuum furnace parts
Electrical insulators
Heating element supports
Temperature measurement

Who It Is For

Specifications

Refractory Alumina Ceramic Tube specification
Color	White, pink
Density	3.85 g/cm3
MONS' Hardness	Grade 9
Maximum Use Temperature	1650°C

Material Data

99% Alumina Ceramic Properties
Item	Unit	Typical value
Physical Properties
Color		Ivory/Beige
Density	g/cm3	3.85
Alumina Content	%	99%
Gas permeability		0
Water Absorption		0
Mechanical Properties
MONS' Hardness	Grade	9
Rockwell Hardness	HRA	92
Vickers Hardness (Hv50)	Gpa(Kg/mm2)	15.7 (1600)
Flexural Strength (20C)	Mpa	330
Compressive Strength (20C)	Mpa	2000
Fracture Toughness (20C)	MPam1/2	4
Modulus of Elasticity	Gpa	350-400
Thermal Properties
Thermal Conductivity (20C-400C)	W(m.K)	27.5
Thermal Expansion Coefficient	10-6/C	7.6
Thermal Shock Resistance	dT C	200
Maximum Use Temperature	C	1650
Electronic Properties
Dielectric Strength	KV/mm	> 10
Dielectric Constant	Er	9.1
Dielectric Loss Angle (1MHz)		0.0002-0.0003
Volume Resistivity (20C)	ohm.cm	> 10^14

Manufacturing Process

Material And Drawing ReviewWe start from your drawing, sample or performance requirement and confirm which of the five material families fits the duty.
Powder Preparation And FormingDry pressing, hot pressing or injection moulding, chosen by the shape and the wall thickness of the part.
High Temperature SinteringParts are sintered to full density. Zirconia reaches 6.0 g/cm3 and 99% alumina reaches 3.85 g/cm3.
Grinding Polishing And CNCSurface grinding, internal and external diameter grinding and precision CNC machining bring the part to final size and finish.

Quality Control

We promise to provide quality assurance for all products. Parts are inspected according to your drawings and we issue an inspection report with the shipment.

We follow standard packaging protocols to protect your products during transit and provide photographic documentation of the packing and shipping process for your reference. In the event of transportation damage caused by non-human factors, we arrange a free replacement shipment.

From raw material preparation, forming, surface grinding, internal and external diameter grinding, to precision CNC machining, all processes are carried out in house under strict quality control.

See the full quality page

Customisation Options

Size and shape made to your drawing
Material grade selected against the duty rather than assumed
Surface finish, including ground and polished faces
Colour where the material allows it
Metallizing and plating where the part has to braze into an assembly

Our main business is OEM and ODM. Send your drawing over WhatsApp or email and we will quote the part.

Comparison With Other Materials

Published values from our own material tables
Property	Zirconia	Alumina	Steatite
Flexural strength	Zirconia 800 MPa	99% alumina 330 MPa	Steatite relatively high
Fracture toughness	Zirconia 9.0 MPam1/2	99% alumina 4 MPam1/2	Not published
Max use temperature	Zirconia not rated here	99% alumina 1650C	Steatite 1100C
Thermal conductivity	Zirconia 2.5 W(m.K)	99% alumina 27.5 W(m.K)	Good
Density	Zirconia 6.0 g/cm3	99% alumina 3.85 g/cm3	Talc based
Dielectric strength	Zirconia not published	99% alumina >10 KV/mm	Excellent

Read the full material comparison

Use Guide

Confirm the fit before you order volumeTake a free sample first. Samples ship in 4 to 7 working days and we do not charge for the part, only the freight.
Give the critical dimension a toleranceCeramic is ground to size after sintering. Marking one dimension as critical is cheaper than treating them all as critical.
Handle by the body, not the edgeCeramic is hard but it chips. Zirconia tolerates handling far better than alumina because its fracture toughness is more than twice as high.
Tell us the duty, not just the shapeTemperature, fluid, load, speed, and whether the part has to insulate or stay non-magnetic, all change which grade we would quote.

Questions About This Part

Can this part be made to our drawing?

Yes. We can supply the products according to the customer's drawings, samples and performance requirement.

What is the minimum order quantity?

MOQ depends on the size and the forming route. Send the drawing and we will confirm it with the quotation.

How long does a sample take?

Sample delivery is 4 to 7 working days, free of charge, freight not included.

What are the payment terms?

Payment up to 1000 USD is 100% in advance. Above 1000 USD it is 50% T/T in advance with the balance before shipment.

How will the parts be packed?

We follow standard packaging protocols and provide photographic documentation of the packing and shipping process for your reference.

Related Services

Laser Machining For SubstratesCutting, drilling, scribing and marking

Get A Price On Refractory Alumina Ceramic Tube

Send the drawing, the quantity and the duty. Samples are free and take 4 to 7 working days.