 |
 |
|
|
 Industrial
furnaces are becoming more and more diversified with the advancement
of various industrial fields. Refractories must be suited to the operating
conditions of each industrial furnace. As exemplified by Variform,
monolithic refractories are characterized by stable volume and high
spalling resistance. Unlike shaped bricks, monolithic refractories
can be handled by novice workers during brief construction periods.
Monolithic refractories have been successfully used for various purposes
including installation and repairing of industrial furnaces.
Similarly, use of ceramic fibers in industrial furnaces is also increasing.
With their good insulating properties and low heat capacities, ceramic
fibers are becoming widely applied to linings of heating furnaces.
Variform, a light weight insulating castable that contains ceramic
fibers, has superb heat resistance and corrosion resistance. Unlike
conventional castable, Variform can be easily applied to linings of
industrial furnaces, tundishes of molten steel containers, and the
refractory lining of ladle covers. When applied to heating furnaces,
in contrast to conventional castable, fine cracks develop when Variform
is heated. This means the development of large cracks that may lead
to chunk type peeling is mitigated. While conventional walls adopt
a two-layer structure consisting of refractory and insulating castable,
the use of Variform allows a single layer structure, which results
in shorter and simpler construction procedures. A Versatile product
line of casting, trowelling and gunning materials application of Variform
in a variety of furnace portions and operating conditions, resulting
in improved efficiency of maintenance work. |
| |
 |
 |
High heat resistance:
The castable is made of Bulk Fiber, high-alumina refractory
aggregate and alumina binder. |
|
Light-weight and low thermal conductivity:
Bulk density and thermal conductivity are both reduced to one-third,
compared to conventional insulating refractory castable for
1600ºC grade. |
|
High corrosion resistance:
Variform is comparable to conventional refractory castables
in scale resistance. |
|
Workability:
Variform can be easily handled even when applied to complicated
portions. Because its disassembly is also easy to perform, the
time required for this process work is also significantly reduced.
|
|
| |
 |
|
Heating and aluminum melting furnaces. |
|
Water cooling skid, cross and support pipes in
steel heating furnace. |
|
Tundish and ladle covers and ladle pre-heater. |
|
Refractory patching. |
|
| |
 |
| |
C15 |
C13 |
C12 |
T15 |
T14 |
T12 |
| Maximum Use Temp.
(ºC) |
1500 |
1300 |
1200 |
1500 |
1400 |
1200 |
| Chemical Composition
(%) |
Al2O
3 |
73 |
71 |
70 |
71 |
60 |
40 |
| |
SiO2 |
24 |
26 |
27 |
24 |
20 |
35 |
| Bulk Density (kg/m3) |
110ºC |
890 |
900 |
900 |
940 |
880 |
900 |
| 1200ºC |
- |
- |
870 |
- |
- |
830 |
| 1300ºC |
860 |
870 |
- |
900 |
830 |
- |
| 1500ºC |
880 |
- |
- |
900 |
- |
- |
| Linear Shrinkage(%) |
110ºC |
0.15 |
0.20 |
0.20 |
0.20 |
0.1 |
0.1 |
| 1200ºC |
- |
- |
1.95 |
- |
- |
1.9 |
| 1300ºC |
0.85 |
1.9 |
- |
1.0 |
1.25 |
- |
| 1500ºC |
1.65 |
- |
- |
1.9 |
- |
- |
| Cold Crushing Strength
(Mpa) |
1200ºC |
- |
- |
2.5 |
- |
- |
2.5 |
| 1300ºC |
2.3 |
2.6 |
- |
1.2 |
2.7 |
- |
| 1500ºC |
2.7 |
- |
- |
1.6 |
2.7 |
- |
| Coefficient of Thermal
Expansion (%) 1000ºC |
0.16 |
0.1 |
0.1 |
0.2 |
0.1 |
0 |
| Thermal Conductivity
(W/mK) |
350ºC |
0.24 |
0.24 |
0.24 |
0.26 |
0.30 |
0.25 |
| 1000ºC |
0.32 |
0.30 |
0.30 |
0.37 |
0.40 |
0.35 |
| Application Method |
Casting |
Trowelling |
| Type of Setting |
Hydraulic
Setting |
| Amount Required (kg/m3) |
1000 |
| Standard Content of
Mixing Water (Wt%) |
60 |
|
| |
 |
| Variform is shipped
in moisture-proof bags containing 10kgs. |
|
| Specifications are subject to change without notice. |
|
|
|
Other Products
