Alumina Tubes

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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.
Please Specify the Tube ID, OD and Length In the Quote Request Form

American Unit 99.5% and 99.8% Alumina Tube
Sentro Tech Catalog #	Outside Dia.		Inside Dia.
Sentro Tech Catalog #	in.	mm	in.	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	0.250	6.35
STT-0316	7/16	11.13	0.316	7.94
STT-0375	1/2	12.70	0.375	9.53
STT-0437	11/16	17.46	0.437	11.11
STT-0500	3/4	19.05	0.500	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	25.4 0	0.750	19.05
STT-0875	1 1/8	28.58	0.875	22.23
STT-1000	1 1/4	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-3875	4 1/4	107.95	3 7/8	98.42
STT--4125	4 1/2	114.30	4 1/8	104.77
STT-4375	4 3/4	120.65	4 3/8	111.12
STT-4625	5	127.00	4 5/8	117.47
STT-4875	5 1/4	133.35	4 7/8	123.82
STT-5000	5 1/2	139.70	5	127.00
STT-5500	6	152.40	5 1/2	139.70
STT-6000	6 1/2	165.10	6	152.40
STT-6250	6 3/4	171.45	6 1/4	158.75
STT-6500	7	177.80	6 1/2	165.10
STT-7000	7 1/2	190.50	7	177.80
STT-8000	8 1/2	215.90	8	203.20
STT-9000	9 1/2	241.30	9	228.60

Typical demensional tolerances: +/- 5% for Diameter and +/- 1.2% for the length

Max tube ID: 9", max tube length up to 72", please contact our sales office for Detail

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 24^oC	230	200
(BTU-in/ft²-hr-^oF) 800^oC	60	50
Dielectric Strength 24^oC V/Mil	300	270
Thermal Expansion (per ^oC x 10^-6)	8	8.4
(24^oC-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.