Alumina Tubes

SentroTech Offers 99.5% and 99.8% High Purity Alumina Tubes. Both Metric and American sizes are available. These alumina tubes offer:

Extreme high temperature stability under reducing, inert and high vacuum condition under high temperature up to 1800C.
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.
SentroTech also offer volume discount for all listed sizes if order quantity is more than 5 pieces for same size.

Typical Physical Properties
MATERIAL	ALUMINA
Composition	99.80% AL2O3	99.5% AL2O3
Bulk Specific Gravity (g/cc)	3.9	3.8
Color	Ivory	Ivory
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 oC	1750 oC
Likely Sag Temp. Unsupported Tube*	1600 oC	1600 oC
Thermal Conductivity 24oC	230	200
(BTU-in/ft2-hr-oF) 800oC	60	50
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.

Typical Physical Properties