Comprehensive protection of the metal jet from oxidation
23.05.2017
Cardboard MKRK-500
Cardboard MKRK-500 made of fire-resistant fiber is produced on the basis of mullite-siliceous fibers obtained by melting pure aluminum and silicon oxides in an electric furnace with subsequent fiber formation by blowing. To give cardboard the necessary properties, an organic or inorganic binder is added to the fiber, the products are made by vacuum pressing.
MKRK-500 cardboard is an effective insulating material that is easy to process and is glued on inorganic glue. It is used as a heat-insulating and heat-compensating material, for the manufacture of refractory products of complex shape – spacers, diaphragms, screens.
During installation, take into account possible linear and volume shrinkage during heating.
Properties of cardboard MKRK-500
- high thermal resistance
- low thermal conductivity
- low density
- low heat capacity
- high chemical resistance
- thermal shock resistance
- good workability
- good electrical insulating properties
- resistance to vibrations and deformations
- the material belongs to the non-combustible class
- good sound insulation
Application
- thermal insulation of thermal equipment
- insulation of electric furnaces
- isolation of ladles, mixers, accumulators of all types
- thermal compensation of dense refractories
- insulating pads, tabs, screens
- insulating layers of air heaters, gas ducts
- insulation of boilers, doors, dampers
- construction of buildings, boiler houses, steam pipelines
- transport engineering, shipbuilding
- household appliances, heaters, gas heaters
- ceramic firing furnaces, glass production
- transport screens, covers
- insulation of doors, shutters, technological windows
- fire protection screens, wiring channels
- fire safety of technical systems
Advantages
- effective thermal insulation with fuel economy
- has sufficient structural strength
- quick and easy installation
- reducing consumption of ceramic refractories
- reducing the metal capacity of the lining structure
- reduction of installation time
- quick and easy installation
- durability
- does not contain asbestos
Dimensions. Release forms
- 500*500*2-20 мм
- 600*500*2-20 мм
- 600*400*2-20 мм
- 600*700*2-20 мм
- 700*500*2-20 мм
- 700*400*2-20 мм
MKRK-500 cardboard is produced in the form of standard plates, strips, with a covering of auxiliary materials (foil insulation, laminating layer, etc.) and other forms according to the requirements of consumers.
Technical specifications
|
Standard |
GOST 23619-79 |
|
Conjunctive |
organic, inorganic |
|
Density, no more, kg/m3 |
500 |
|
Application temperature is maximum, °С |
1260 |
|
Temperature of long-term use, °С |
1150 |
|
Mass loss at 1000 °C, no more than % |
10 |
|
Thermal conductivity at 600 °C, no more, W/ (m K) |
0.16 |
|
Heat capacity at 1000 °C, kJ / ( kg K ) |
1.047 |
|
Chemical composition, % |
|
|
AI2O3, not less |
45 |
|
SiO2, no more |
45 |
|
(Al2O3+SiO2), not less |
90 |
MKRK-500 fibrous cardboard is chemically resistant to acids and alkalis. When used at high temperatures, it should be protected from the action of concentrated alkalis, hydrofluoric and phosphoric acids. Plates are more resistant to temperature effects in oxidizing and neutral environments. In a reducing environment, thermal insulation properties decrease.
Thermal conductivity at temperature T, °C, W/(m K)
|
200 |
400 |
600 |
800 |
1000 |
1200 |
|
0.09 |
0.11 |
0.15 |
0.19 |
0.24 |
0.31 |