As the steel manufacturing, ceramic and heavy and chemical industries develops, the demand for the refractory materials
is steadily growing. And the refractory materials now tends to take the form of non-shaped refractory materials such as
castable |
| |
And the importance of alumina cement that is used mainly as binder for castable
refractory materials is being highlighted ever more. SEKYUNG CORPORATION
pays extreme attention to the selection of the materialsand applies a strict quality
control procedure for the production of alumina cement. Melted or sintered at high
temperature, its excellent quality is gaining recognitionsfrom both home and
abroad. |
 |
|
| |
|
◎ UAC50
|
|
- General characteristics
|
- Hydraulic cement with approximately 50% alumina
- Does not contain any additives
- Manufactured by melting in electric furnace.
- Stable physical properties.
- Good resistance to fire (m.p. 1460 ℃ )
- Excellent strength & low permanent linear change.
- Widely used for production of refractory castable & insulating castable.
|
| |
|
- Cement Properties
|
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Chemical Composition
|
CaO
|
%
|
34
|
38
|
35.0~37.0
|
|
Al2O3
|
%
|
50
|
|
51.0~54.0
|
|
SiO2
|
%
|
3
|
6
|
3.5~5.5
|
|
TiO2
|
%
|
|
4
|
2.5~3.5
|
|
Fe2O3
|
%
|
|
2
|
0.8~1.5
|
|
Na2O
|
%
|
|
|
0.02~0.1
|
|
K2O
|
%
|
|
|
0.1~0.3
|
|
MgO
|
%
|
|
|
0.5~3.5
|
|
Fineness
|
90 ㎛ remains
|
%
|
|
5
|
1.5~3.5
|
|
Blaine
|
㎠ /g
|
4000
|
|
4500~5500
| |
| |
| - Mortar Properties (Cement : Sand : Water = 1 : 2.2 : 0.56) |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Flow
|
23 ℃
|
3 minutes
|
mm
|
210
|
|
220~235
|
|
30 munutes
|
mm
|
210
|
|
220~240
|
|
30 ℃
|
3 minutes
|
mm
|
|
|
210~230
|
|
30 minutes
|
mm
|
|
|
210~230
|
|
Setting Properties (23 ℃ )
|
Vicat test
|
Initial
|
hr : min.
|
|
|
3:00~4:00
|
|
Final
|
hr : min.
|
|
|
5:00~6:00
|
|
Exothermic Reaction time
|
hr : min.
|
5
|
7
|
5:30~6:30
|
|
Cured Strength (23 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
50
|
|
55~65
|
|
Compressive
|
kgf/ ㎠
|
450
|
|
520~650
|
|
Dired Strength (110 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
|
50~55
|
|
Compressive
|
kgf/ ㎠
|
|
350~450
| |
| |
|
◎ UAC70N
|
|
- General characteristics
|
UAC-70N is made in rotary kiln using high purity raw materials and does not contain any additives and α-Al₂O₃.
So it shows good workability and excellent strength, specially, dry & hot strength of UAC-70N is higher than any
other alumina cement because it contains rich cement minerals as CA, CA ₂ . UAC -70N is widely recommended for
high technology refractories such as low cement castable and ultra low cement castable | |
| |
| (The characteristics of UAC -70N) | |
- Consistant properties
- UAC -70N does not contain any additives.
- It gives a full flexibility in application needs without potential mismatches.
- High strength and long workable time.
|
| |
| - Cement Properties |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Chemical Composition
|
CaO
|
%
|
26
|
29
|
27.5~28.5
|
|
Al2O3
|
%
|
69
|
|
70~71
|
|
SiO2
|
%
|
|
0.5
|
0.1~0.3
|
|
TiO2
|
%
|
|
|
|
|
Fe2O3
|
%
|
|
0.5
|
0.05~0.1
|
|
Na2O
|
%
|
|
|
0.1~0.2
|
|
MgO
|
%
|
|
0.6
|
0.1~0.4
|
|
Fineness
|
Blaine
|
㎠ /g
|
4000
|
|
4800~5400
| |
| |
| - Mortar Properties (Cement : Sand : Water = 1 : 2.2 : 0.56) |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Flow
|
20 ℃
|
3 minutes
|
mm
|
210
|
|
230~250
|
|
30 munutes
|
mm
|
210
|
|
235~255
|
|
60 munutes
|
mm
|
|
|
220~250
|
|
30 ℃
|
3 minutes
|
mm
|
|
|
220~240
|
|
30 minutes
|
mm
|
|
|
220~240
|
|
Setting Properties (23 ℃ )
|
Vicat test
|
Initial
|
hr : min
|
|
|
4:30~5:30
|
|
Final
|
hr : min
|
|
|
5:30~7:30
|
|
＊ Exothermic Reaction time
|
hr : min
|
5
|
11
|
7:00~8:30
|
|
Cured Strength (23 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
40
|
|
50~65
|
|
Compressive
|
kgf/ ㎠
|
300
|
|
400~550
|
|
Dired Strength (110 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
|
|
60~80
|
|
Compressive
|
kgf/ ㎠
|
|
|
500~600
| |
| |
|
◎ UAC70S
|
|
- General characteristics
|
|
UAC - 70S is a specially formulated calcium aluminate cement containing approximately 70% alumina. It is designed to provide consistent physical properties, excellent flow characteristic and long workable time in hot temperature.It does not contain any additives, so it is suitable for low cement castable & ultra low cement castable.
| |
| |
|
(The characteristics of UAC -70S)
| |
- Stable workable time in hot atmosphere.
- Suitable for low cement castable using a phosphate additives.
- High strength and long workable time.
|
| |
| - Cement Properties |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Chemical Composition
|
CaO
|
%
|
26
|
28
|
26.5~27.5
|
|
Al2O3
|
%
|
71
|
|
72~73
|
|
SiO2
|
%
|
|
0.5
|
0.1~0.3
|
|
TiO2
|
%
|
|
|
|
|
Fe2O3
|
%
|
|
0.5
|
0.05~0.1
|
|
Na2O
|
%
|
|
|
0.1~0.2
|
|
MgO
|
%
|
|
0.6
|
0.1~0.42
|
|
Fineness
|
Blaine
|
㎠ /g
|
4000
|
|
4300~4500
| |
| |
| - Mortar Properties (Cement : Sand : Water = 1 : 2.2 : 0.56) |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Flow
|
20 ℃
|
3 minutes
|
mm
|
210
|
|
230~250
|
|
30 munutes
|
mm
|
210
|
|
230~250
|
|
60 munutes
|
mm
|
|
|
220~240
|
|
30 ℃
|
3 minutes
|
mm
|
|
|
220~240
|
|
30 minutes
|
mm
|
|
|
220~240
|
|
Setting Properties (23 ℃ )
|
Vicat test
|
Initial
|
hr : min
|
|
|
3:30~4:30
|
|
Final
|
hr : min
|
|
|
4:00~5:00
|
|
＊ Exothermic Reaction time
|
hr : min
|
4
|
9
|
6:00~7:30
|
|
Cured Strength (23 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
40
|
|
45~55
|
|
Compressive
|
kgf/ ㎠
|
300
|
|
350~400
|
|
Dired Strength (110 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
|
|
60~70
|
|
Compressive
|
kgf/ ㎠
|
|
|
450~550
| |
|
|
* Exothermic Reaction time is tested by recording the exothermic heat development during cement hydration.
The time when the mix has reached its reached its maximum temperature corresponds to the Vicat Final setting time.
|
| |
|
◎ UAC80N
|
|
- General characteristics
|
|
UAC - 80N is made in rotary kiln using its main ingredient, high purity materials. The whole production process is fully
automated using a state-of-the-art computer system.All products go through quality control procedure in which they are analyzed on the spot by high procisionanalyzing equipment and treated accordingly.Union Alumina Cement 80N
has highest content of Al₂O₃and a high purity product with minimum impurities such as SiO₂and Fe₂O₃.
It is used for castable high temperature (1800 ℃ ) and material for castable which requires durability and resistance to heat and impact.
| |
| |
|
(The characteristics of UAC -80N)
| |
- Longer workable Time and Good Workability.
- Stable Physical Properties.
- Excellent Explosive Spalling Resistance.
- High Hot Strength.
|
| |
|
- Cement Properties
|
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Chemical Composition
|
CaO
|
%
|
16
|
19
|
17.0~18.5
|
|
Al2O3
|
%
|
78
|
|
79~81
|
|
SiO2
|
%
|
|
0.4
|
0.1~0.3
|
|
TiO2
|
%
|
|
|
|
|
Fe2O3
|
%
|
|
0.3
|
0.02~0.1
|
|
Na2O
|
%
|
|
|
0.2~0.4
|
|
MgO
|
%
|
|
|
0.1~0.4
|
|
Fineness
|
38 ㎛ remains
|
%
|
15
|
25
|
18~22
|
|
Blaine
|
㎠ /g
|
|
8300~8700
| |
|
| ＊ Fused Alumina |
5~3m/m 16% 220F 7% 3~1m/m 30% 325F 14% 1~0m/m 13% | |
| |
| - Castable Properties (Cement: Fused Alumina : Water = 1:4.0 : 0.45) |
|
Properties
|
Unit.
|
Specification
|
Typical Range
|
|
Min
|
Max
|
|
Flow
|
23 ℃
|
3 minutes
|
mm
|
140
|
|
155~170
|
|
30 munutes
|
mm
|
140
|
|
155~170
|
|
Setting Properties (23 ℃ )
|
Exothermic Reaction time
|
hr : min
|
5
|
9
|
6~8
|
|
Cured Strength (23 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
30
|
|
40~60
|
|
Compressive
|
kgf/ ㎠
|
160
|
|
200~230
|
|
Dired Strength (110 ℃ ×24hr)
|
Flexural
|
kgf/ ㎠
|
|
100~120
|
|
Compressive
|
kgf/ ㎠
|
|
700~800
| |
|
| ※ Packaging : 25kg and / or 1MT Jumbo Bag available |
Home > Product Information > Sekyung Corporation > Refractory
