Typical application
A1148 is available in large blocks for glass melting of high quality ophthalmic, optical and other specialty glassese.
With almost no porosity, it provides good corrosion resistance with very minimal stone, seed and cord defects.
Chemical and physical properties
Microstructure
Image
Typical chemical composition
Typical crystallographic analysis
Main phase:
- corundum
- mullite
Physical characteristics
| Description | International standards | British standards |
|---|---|---|
| Refractoriness under load of 2 105 Pa, at 0.5% | >1,675°C | 3,047°F |
| Cold crushing strength | 448Mpa | 64,977psi |
| Linear thermal expansion | 8 10-6K-1 | 4.4 10-6°F-1 |
| Thermal conductivity at 1,000°C | 4.1 W.m-1.K-1 |
28.4 BTU |
| Apparent porosity | 1% | 1% |
| Typical bulk density | 3.4g/cm3 | 212pcf |
Storage
The sintered dense high alumina 93%, A1148 solution must be stored in a dry environment protected from weather conditions.