Burntstone
CERAMIC LIMITED
Technical Data
June 2000
SG70 type
Structural Ceramic Sheet
Description
SG70 ceramic sheets are reinforced with continuous fibres to increase the toughness, structural reliability and overall performance of the ceramic composite. They do not contain asbestos or RCF (Refractory Ceramic Fibre as defined in CHIP98 regulations Index 650-017-00-8) materials. Supplied in sheets, boards, cylinders and other geometric shapes, and in two densities, SG70 products exhibit non-brittle behaviour and can withstand extreme thermal shock and cycling within their specified temperature ranges. Chemically inert, unaffected by moisture and non-wetting to non--ferrous metals, SG70 is machinable with standard tools. Thermally and electrically insulating, SG70 is an excellent material choice for a variety of structural applications. It is widely used as a replacement for dense asbestos products, silica/mica/phosphate based materials, vacuum formed fibreboard, monolithic ceramics and reinforced plastics where superior structural performance is required. All grades have a maximum service temperature limit of 1260°C and can be used in structural applications up to 745°C or 815°C depending on density.
The two grades are SG70-130 with 2000kg/m3 density and SG70-95, 1510kg/m3.
Chemical Properties
| Al2O3 | 70% | SiO2 | 20% |
Other metal oxides | 10% |
Physical Properties
| SG70-130 | SG70-95 |
|---|
| Maximum Service Temperature |
| Continuous service | 815°C | 745°C |
| Short term service | 1260°C | 1260°C |
| Density (kg/m3) | 2000 | 1510 |
| Modulus of Rupture (MPa) | 58 | 29 |
| Compressive strength (MPa) | 85 | 73 |
| Linear change (%) after 24h at | |
| 745°C | - | -0.5 |
| 870°C | -0.5 | - |
| 1260°C | -1 | -1 |
| Electrical resistivity (Ohm.cm) | 52x1010 | 64x1010 |
| Dielectric Constant | 5.5 | 5.3 |
| Dielectric Strength (V/mm) | 3580 | 3660 |
| Thermal conductivity |
| Temperature °C | W/mK |
| 205 | 0.60 | 0.43 |
| 425 | 0.63 | 0.45 |
| 625 | 0.67 | 0.46 |
| 1000 | 0.70 | 0.47 |
Applications
| – HIP and hot press plattens |
– Induction coil liners and supports |
| – Kiln furniture |
– Electrical insulation |
Availability
| Grade | SG70-130 | SG70-95 |
|---|
| Density | 2000 | 1510 |
| Sheets | All types 1220 x 1220mm |
| Thickness | 0.8, 1.6, 3, 4.5, 5.3, | - |
| 6, 9, 13, 19, 25, | 6, 9, 13, 19, 25, |
| 32, 37, 51, 76, 102mm | 32, 37, 51, 76, 102mm |
| Cylinders and shapes |
| Inner diameter | up to 915mm | On request |
| Wall thickness | 3 to 13mm | |
| Length | up to 2150mm |
| – other shapes and sizes on request. |
The information and data herein are offered solely for your consideration and guidance and are not to be construed as a warranty or specification. Nothing contained herein is to be interpreted as authorisation to practice a patented invention without a licence.
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BURNTSTONE CERAMIC LIMITED 19 Redgates, Walkington, Beverley HU17 8TS
Tel: +44 (0) 1482 868706
E-mail: sales@burntstone.co.uk Home page: http://www.burntstone.co.uk
Registered in England 2113851 |
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| Website Version 4.6 - Last revision date: 12 March 2008
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