High Alumina Tubes

Get Elevated Temperature Stability with Alumina
Ceramic Tubes

asianthermalceramic’s alumina tubes, with 99.5% to 99.8% high-purity, offer elevated temperature stability. Alumina ceramic tubes come in custom sizes, including American and Metric, and offer a low material cost.

Minerals containing alumina used in alumina tubes make up nearly 15% of the earth’s crust making it practically inexhaustible and versatile. Alumina combines low thermal expansion, superior thermal conductivity, and high-compressive strength to make these furnace tubes thermal-shock resistant. Sentro Tech alumina furnace tube models come with elevated dielectric properties and offer a higher vacuum or protective atmosphere at an extreme temperature.

Features of Alumina Ceramic Tubes for High-Temperature

Extreme high-temperature stability under reducing, inert, and high-vacuum conditions under high temperatures up to 1800°C.
Extreme wear and abrasion resistance.
Chemical corrosion resistance under high temperature.
High dielectric properties.

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).

Protective atmospheres or high vacuum at high-temperature to eliminate contamination or impurity.
Sentro Tech also offers a volume discount for all listed sizes if the order quantity is more than 5 pieces for the same size.
Low material cost and custom size available.
Most items are in stock and can be delivered in 1-3 days.

Request a Quote on Alumina Furnace Tubing

Physical Properties of Alumina Tubes

Compressive Strength (PSI)370,000350,000

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
Tensile Strength (PSI)	43,000	33,000
Maximum Working Temperature	1800°C	1750°C
Likely Sag Temp. Unsupported Tube*	1600°C	1600°C
Thermal Conductivity 24°C	230	200
BTU-in/ft2-hr-oF) 800°C	60	50
Dielectric Strength 24°C V/Mil	300	270
Thermal Expansion (per °C x 10-6)	08	8.4
(24°C-1000 °C)
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.

Standard Alumina Tube Dimensions

OUTSIDE DIA.		INSIDE DIA.
PART #	INCH	MM	INCH	MM
STT-0187	1/4	6.35	0.187	4.75
STT-0196	0.276	7.00	0.196	5.00
STT-0250	3/8	9.53	1/4	6.35
STT-0316	7/16	11.13	0.316	7.94
STT-0375	1/2	12.70	3/8	9.53
STT-0437	11/16	17.46	0.437	11.11
STT-0500	3/4	19.05	1/2	12.70
STT-0563	3/4	19.05	0.563	14.29
STT-0625	7/8	22.23	0.625	15.87
STT-0750	1	25.40	3/4	19.05
STT-0875	1 1/8	28.58	7/8	22.23
STT-1000	1.25	31.75	1	25.40
STT-1125	1 3/8	34.92	1 1/8	28.57
STT-1250	1 1/2	38.10	1 1/4	31.75
STT-1375	1 5/8	41.27	1 3/8	34.93
STT-1500	1 3/4	44.45	1 1/2	38.10
STT-1625	1 7/8	47.63	1 5/8	41.27
STT-1750	2	50.80	1 3/4	44.45
STT-1875	2 1/8	53.96	1 7/8	47.63
STT-2000	2 1/4	57.15	2	50.80
STT-2125	2 3/8	60.33	2 1/8	53.97
STT-2250	2 1/2	63.50	2 1/4	57.15
STT-2500	2 3/4	69.85	2 1/2	63.50
STT-2750	3	76.20	2 3/4	69.85
STT-2875	3 1/4	82.55	2 7/8	73.03
STT-3000	3 1/4	82.55	3	76.20
STT-3125	3 1/2	88.90	3 1/8	79.37
STT-3250	3 1/2	88.90	3 1/4	82.55
STT-3375	3 3/4	95.25	3 3/8	85.70
STT-3500	3 3/4	95.25	3 1/2	88.90
STT-3625	4	101.60	3 5/8	92.07
STT-4000	4 2/5	112.00	4	101.60
STT-4500	5 2/5	125.00	4 1/2	114.30
STT-5000	5 1/2	138.00	5	127.00

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