Refractory Sheet Press Board (RSPB) is a silica matrix composite produced from low thermal expansion raw materials consisting of 99.7% silica. These rigid high strength fiber reinforced structural ceramicell nameomposites have a thermal expansion coefficient of .3 x 10-6/ºC which provides remarkable resistance to thermal shock up to 1200ºC (2192ºF). Beyond 1200ºC (2192ºF) it begins to transform into a crystalline structure, but maintains its properties up to 1650ºC (3002ºF) providing that there is no significant drop in temperature. At thescell namelevated temperatures, RSPB will exhibit surface glazing, but will retain its strength and integrity.
Mechanical properties of Refractory Sheet Press Board exceed those of high temperature calcium silicate as well as many other structural insulation materials. RSPB is 100% inorganic, contains no refractory ceramic fibers (RCFs), and undergoes little or no outgassing on heating. It also exhibits exceptional non-wetting properties when used in contact with molten aluminum, zinc, lead, tin, and other non-ferrous metals.
Specifications
| Density ( lb/ft³ ) | 90 |
|---|---|
| Density ( g/cc ) | 2.1 |
| Modulus of Rupture ( MPa ) | 30 |
| Modulus of Rupture ( psi ) | 4300 |
| Sheet Size ( in ) | 24 x 36 36 x 48 |
| Porosity ( % ) | 31 |
| Color | White |
| Dielectric Strength ( V/mil ) | 43 |
| Thickness ( in ) | 1/8 to 3 |
| Volume Resistivity ( ohm-cm ) | 7.5 x 109 |
| Coefficient of Thermal Expansion at (Room Temp. to 800ºC) | 0.3 x 10-6/Per ºC |
| Nominal Composition | Al2O3 - 0.10% Fe2O3 - 0.03% MgO - 0.03% Na2O - 0.05% Organics - 0% SiO2 - 99.7% |
| Organics ( % ) | 0 |
| Hardness, Durometer D | 87 |
| Charpy Impact Strength ( ft.lb ) | 0.8 |
| Compressive Strength at 2% Consolidation ( MPa ) | 48 |
| Compressive Strength at 2% Consolidation ( psi ) | 7000 |
| Maximum Service Temperature (Cyclic Conditions) ( ºC ) | 1200 |
| Maximum Service Temperature (Cyclic Conditions) ( ºF ) | 2192 |
| Maximum Service Temperature (Non-Cyclic) ( ºC ) | 1650 |
| Maximum Service Temperature (Non-Cyclic) ( ºF ) | 3002 |
| Linear Shrinkage, 24 hrs. at 800ºC (1472ºF) ( % ) | 0.1 |
| Linear Shrinkage, 24 hrs. at 1000ºC (1832ºF) ( % ) | 1 |
| Thermal Conductivity at 200ºC (392ºF) ( BTU-in/hr-ft²-ºF ) | 0.54 |
| Thermal Conductivity at 200ºC (392ºF) ( W/m-ºK ) | 3.8 |
| Thermal Conductivity at 400ºC (752ºF) ( BTU-in/hr-ft²-ºF ) | 0.64 |
| Thermal Conductivity at 400ºC (752ºF) ( W/m-ºK ) | 4.4 |
| Thermal Conductivity at 600ºC (1112ºF) ( BTU-in/hr-ft²-ºF ) | 0.61 |
| Thermal Conductivity at 600ºC (1112ºF) ( W/m-ºK ) | 4.2 |
| Thermal Conductivity at 800ºC (1472ºF) ( BTU-in/hr-ft²-ºF ) | 0.67 |
| Thermal Conductivity at 800ºC (1472ºF) ( W/m-ºK ) | 4.6 |
| Thermal Conductivity at 1000ºC (1832ºF) ( BTU-in/hr-ft²-ºF ) | 0.75 |
| Thermal Conductivity at 1000ºC (1832ºF) ( W/m-ºK ) | 5.2 |
| Availability | Moldable Sheet Tube |
Note
Maximum use temperature is dependent on variables such as thermal & mechanical stress, and the chemical environment the material is subjected to.