Alumina Ceramic Crucible
High-purity alumina ceramic crucibles are manufactured with high-alumina raw materials via isostatic pressing and high-temperature sintering. Featuring outstanding heat resistance and chemical inertness, they serve as essential high-temperature labware widely used for high-temperature sintering, ashing, melting and thermal treatment in laboratories, new energy materials, metallurgy, rare earth processing, electronic ceramics and powder material industries. They are ideal matching vessels for muffle furnaces, tube furnaces and chamber furnaces.
1. Material Options
99% Alumina (Corundum Crucible): Mainstream grade, continuous service temperature 1600°C for most working conditions
95% Alumina: Cost-effective option for scenarios without extreme temperature requirements
2. Available Shapes
Cylindrical alumina crucibles in various volumes
Rectangular alumina boats
Special-shaped products: pouring spout crucibles, notched crucibles, trapezoidal boats
Custom non-standard sizes, thickened vessels and special designs according to drawings
1. Excellent High Temperature Resistance
99% alumina crucibles allow continuous working temperature up to 1600°C, with maximum short-term temperature resistance reaching 1750°C. Good thermal shock resistance prevents cracking with proper heating and cooling procedures.
2. Superior Chemical Stability
Resistant to acids, alkalis and oxidation. It barely reacts with most metals, oxides and powder samples under high temperature, effectively avoiding sample contamination and ensuring test accuracy.
3. Dense Body & Low Impurity Content
Dense microstructure with ultra-low water absorption. Low silicon and iron impurities, suitable for high-purity material research and precious metal melting.
4. High Mechanical Strength & Insulation Property
Great electrical insulation at room and elevated temperatures. High structural strength, abrasion resistance and long service life compared with quartz crucibles and ordinary refractory crucibles.
5. Diversified Specifications & Customization
Available shapes include cylindrical crucibles, rectangular alumina boats, trapezoidal boats, notched crucibles and special-shaped vessels. Standard sizes in stock, customized dimensions supported.
|
Material
|
Alumina
|
||||
|
Properties
|
Units
|
AL997
|
AL995
|
AL99
|
AL95
|
|
Alumina
|
%
|
99.70%
|
99.50%
|
99.00%
|
95%
|
|
Color
|
--
|
lvory
|
lvory
|
lvory
|
lvory&White
|
|
Permeability
|
--
|
Gas-tight
|
Gas-tight
|
Gas-tight
|
Gas-tight
|
|
Density
|
g/cm³
|
3.94
|
3.9
|
3.8
|
3.75
|
|
Straightness
|
--
|
1‰
|
1‰
|
1‰
|
1‰
|
|
Hardness
|
Mohs Scale
|
9
|
9
|
9
|
8.8
|
|
Water Absorption
|
--
|
≤0.2
|
≤0.2
|
≤0.2
|
≤0.2
|
|
Flexural Strength
(Typical 20ºC)
|
Mpa
|
375
|
370
|
340
|
304
|
|
Compressive Strength
(Typical 20ºC)
|
Mpa
|
2300
|
2300
|
2210
|
1910
|
|
Coefficient of Thermal
Expansion
(25ºC to 800ºC)
|
10-6/ºC
|
7.6
|
7.6
|
7.6
|
7.6
|
|
Dielectric Strength
(5mm Thickness)
|
AC-kv/mm
|
10
|
10
|
10
|
10
|
|
Dielectric Loss
25ºC@1MHz
|
--
|
<0.0001
|
<0.0001
|
0.0006
|
0.0004
|
|
Dielectric Constant
|
25ºC@1MHz
|
9.8
|
9.7
|
9.5
|
9.2
|
|
Volume Resistivity
(20ºC) (300ºC)
|
Ω·cm³
|
>1014
2*1012
|
>1014
2*1012
|
>1014
4*1011
|
>1014
2*1011
|
|
Long-term operating
temperature
|
ºC
|
1700
|
1650
|
1600
|
1400
|
|
Thermal Conductivity
(25ºC)
|
W/m·K
|
35
|
35
|
34
|
20
|
|
Basic Size of Cylindrical Crucible
|
|||
|
Diameter(mm)
|
Height(mm)
|
Wall Thickness
|
Content(ml)
|
|
15
|
50
|
1.5
|
5
|
|
17
|
21
|
1.75
|
3.4
|
|
17
|
37
|
1
|
5.4
|
|
20
|
30
|
2
|
6
|
|
22
|
36
|
1.5
|
10.2
|
|
26
|
82
|
3
|
34
|
|
30
|
30
|
2
|
15
|
|
35
|
35
|
2
|
25
|
|
40
|
40
|
2.5
|
35
|
|
50
|
50
|
2.5
|
75
|
|
60
|
60
|
3
|
130
|
|
65
|
65
|
3
|
170
|
|
70
|
70
|
3
|
215
|
|
80
|
80
|
3
|
330
|
|
85
|
85
|
3
|
400
|
|
90
|
90
|
3
|
480
|
|
100
|
100
|
3.5
|
650
|
|
110
|
110
|
3.5
|
880
|
|
120
|
120
|
4
|
1140
|
|
130
|
130
|
4
|
1450
|
|
140
|
140
|
4
|
1850
|
|
150
|
150
|
4.5
|
2250
|
|
160
|
160
|
4.5
|
2250
|
|
170
|
170
|
4.5
|
3350
|
|
180
|
180
|
4.5
|
4000
|
|
200
|
200
|
5
|
5500
|
|
220
|
220
|
5
|
7400
|
|
240
|
240
|
5
|
9700
|
|
Basic Size of Rectangled Crucible |
|||||
|
Length(mm) |
Width(mm) |
Height(mm) |
Length(mm) |
Width(mm) |
Height(mm) |
|
30 |
20 |
16 |
100 |
60 |
30 |
|
50 |
20 |
20 |
100 |
100 |
30 |
|
50 |
40 |
20 |
100 |
100 |
50 |
|
60 |
30 |
15 |
110 |
80 |
40 |
|
75 |
52 |
50 |
110 |
110 |
35 |
|
75 |
75 |
15 |
110 |
80 |
40 |
|
75 |
75 |
30 |
120 |
75 |
40 |
|
75 |
75 |
45 |
120 |
120 |
30 |
|
80 |
80 |
40 |
120 |
120 |
50 |
|
85 |
65 |
30 |
140 |
140 |
40 |
|
90 |
60 |
35 |
150 |
150 |
50 |
|
100 |
20 |
15 |
200 |
100 |
25 |
|
100 |
20 |
20 |
200 |
100 |
50 |
|
100 |
30 |
25 |
200 |
150 |
5 |
|
100 |
40 |
20 |
|||
|
Basic Size of Arc Crucible
|
||||
|
Top Dia.(mm)
|
Base Dia.(mm)
|
Height(mm)
|
Wall Thickness(mm)
|
Content(ml)
|
|
25
|
18
|
22
|
1.3
|
5
|
|
28
|
20
|
27
|
1.5
|
10
|
|
32
|
21
|
35
|
1.5
|
15
|
|
35
|
18
|
35
|
1.7
|
20
|
|
36
|
22
|
42
|
2
|
25
|
|
39
|
24
|
49
|
2
|
30
|
|
52
|
32
|
50
|
2.5
|
50
|
|
61
|
36
|
54
|
2.5
|
100
|
|
68
|
42
|
80
|
2.5
|
150
|
|
83
|
48
|
86
|
2.5
|
200
|
|
83
|
52
|
106
|
2.5
|
300
|
|
86
|
49
|
135
|
2.5
|
400
|
|
100
|
60
|
118
|
3
|
500
|
|
88
|
54
|
145
|
3
|
600
|
|
112
|
70
|
132
|
3
|
750
|
|
120
|
75
|
143
|
3.5
|
1000
|
|
140
|
90
|
170
|
4
|
1500
|
|
150
|
93
|
200
|
4
|
2000
|
1. Laboratory: Sample ashing, thermogravimetric analysis, high-temperature sintering and melting tests
2. Advanced Materials: Calcination of ceramic powder, lithium battery materials and rare earth oxides
3. Metallurgy: Small-scale melting of precious and non-ferrous metals
4. Electronics: High-temperature processing of electronic powders and target raw materials
5. Mineral analysis, catalytic materials research and glass melting experiments
Frequently Asked Questions
Need help? Be sure to visit our support forums for answers to your questions!
We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
Yes, of course, you are welcome to visit RBT company and our products.
There is no limit, we can provide the best suggestion and solution according to your situation.
We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
