SG-70 is a non-asbestos ceramic refractory reinforced with continuous fibers to increase the toughness, structural reliability and overall performance of the ceramicell nameomposite. Supplied in sheets, boards, cylinders and other geometric shapes, SG-70 exhibits non-brittle behavior and can withstand extreme thermal shock and cycling within its specified temperature range. Chemically inert, unaffected by moisture and non-wetting to non-ferrous metals, SG-70 is machinable with standard tools. Thermally and electrically insulating, SG-70 is an excellent material choice for a variety of structural applications. Compared to SG-50, the SG-70 material has a more homogeneous fiber reinforcement structure which allows for intricate machining (i.e. counter-boring). It also has a higher service and ultimate use temperature than the SG-50 material.
Other sheet/cylinder sizes and thickness and geometric shapes are available upon request – please inquire.
Specifications
| Density ( lb/ft³ ) | 130 |
|---|---|
| Density ( g/cc ) | 2 |
| Flexural Strength ( MPa ) | 58 |
| Flexural Strength ( psi ) | 8400 |
| Sheet Size ( in ) | |
| Porosity ( % ) | 30 |
| Color | White |
| Maximum Use Temperature ( ºC ) | 1260 |
| Maximum Use Temperature ( ºF ) | 2300 |
| Dielectric Strength ( V/mil ) | 91 |
| Compressive Strength ( MPa ) | 85 |
| Compressive Strength ( psi ) | 12325 |
| Thickness ( in ) | 1/8 to 1/2 |
| Sheet Thickness ( in ) | 1/32 1/16 1/8 3/16 1/4 3/8 1/2 3/4 1 2 3 |
| Typical Composition | Al2O3 - 70% Other Metal Oxides - 10% SiO2 - 20% |
| Length ( in ) | up to 84 |
| Dielectric Constant | 5.5 |
| Sheet Area ( ft ) | 4 x 4 |
| Thermal Conductivity at 1000ºC (1832ºF) ( BTU-in/hr-ft²-ºF ) | 4.9 |
| Thermal Conductivity at 1000ºC (1832ºF) ( W/m-ºK ) | 0.7 |
| Structural Use Temperature ( ºC ) | 816 |
| Structural Use Temperature ( ºF ) | 1500 |
| Thermal Conductivity at 205ºC (400ºF) ( BTU-in/hr-ft²-ºF ) | 4.2 |
| Thermal Conductivity at 205ºC (400ºF) ( W/m-ºK ) | 0.6 |
| Thermal Conductivity at 425ºC (800ºF) ( BTU-in/hr-ft²-ºF ) | 4.41 |
| Thermal Conductivity at 425ºC (800ºF) ( W/m-ºK ) | 0.63 |
| Thermal Conductivity at 625ºC (1200ºF) ( BTU-in/hr-ft²-ºF ) | 4.69 |
| Thermal Conductivity at 625ºC (1200ºF) ( W/m-ºK ) | 0.67 |
| Linear Shrinkage, 24 hrs. Isothermal Soak at 870ºC (1500ºF) ( % ) | 1/2 |
| Linear Shrinkage, 24 hrs. Isothermal Soak at 1260ºC (2300ºF) ( % ) | 1 |
| Electrical Resistivity ( ohm-cm ) | 52 x 1010 |
| Inner Diameter ( in ) | 2 to 36 |
| Engineered Shapes (Cylinders & Shapes) | |
| Machined Parts (Cylinders & Shapes) |
Applications
| Markets | Specific Applications |
|---|---|
| Specialty Furnace Components | Bottom Supports for Quartz Furnaces Hard Face Furnace Lining Low Temperature Kiln Furniture |
| Specialty High Temperature & Electrical Insulation | Corona Plastic Treating in Printing Process Internal Lining for Glass Tempering Furnaces Electrical Resistor Grids in Locomotive Dynamic Systems |
| Specialty Metal Working Components | Insulator Between Press Platens in Plastic Forming of Titanium |
| Compression Plate Insulation | Electric Insulator for Induction Pressing Diamond Saw Segment Platen or Mold Insulation for High Temperature Presses |
| Non-Ferrous Metal Handling Equipment | Aluminum Filter, Homogenizer and Purifier Crustbreaker Plunger hace Aluminum Holding Furnace Skimmer Dams & Baffles Specialty Structural Insulation Components |
| Induction Furnace Components | Channel Melter Components (Brass Foundry) Coil Liners, Channel Melters, Box Plates Coreless Induction Furnace Components Cover, Top, Rase, Side, Front and Bark Plates, Coil Posts Coil Support, Upper Fitting, Spacer, Riser Blocks, Splash and Coil Shields, Crucible Hold Downs, Coil Support Spacer Rings |
| Utility/Energy | Tubesheets, Candle Filters |
This information, which is subject to change, is offered solely for your consideration and is not a warranty or representation for which we assume legal responsibility.
Advantages
- Asbestos-Free
- Use Temperatures to 1260ºC (2300ºF)
- Chemical Inertness
- Non-Wetting to Non-Ferrous Metal
- Unaffected by Moisture or Water
- Non-Brittle
- Abrasion Resistance
- Thermal Shock Resistance
- Good Reflectivity
- Low to Negligible Shrinkage
- Excellent Dimensional Stability
- Machinable with Standard Tools
- High Dielectric Strength / Electrical Resistivity
- Little or No Outgassing
- Good Bending Strength
- Good Compressive Strength
Competitive Products
- RS100/101, 200/201
- Metal / Steel
- Plastics
- Dense Asbestos
- Machinable Ceramic
- Cordierite
- Vacuum-formed Shapes
- Castable Ceramics