Typical application
Mainly used for glass contact and superstructure application for insulation glass furnaces.
WOOL 50 is made of grains from a unique manufacturing process, the very specific chemical and crystallographic structure provides high corrosion resistance with several others benefits such as :
- smooth corrosion profile,
- lower joint corrosion thru better joint closure after heat-up,
- good electrical resistivity,
- lower chrome sublimation.
For crown application, refer to ZIRCHROM HC.
WOOL 50 is also a potential material for overcoating applications.
Chemical and physical properties
Microstructure
Image
Typical chemical composition
Typical crystallographic analysis
Main phase:
- Cr2O3-Al2O3 solid solution
- monoclinic zirconia
Physical characteristics
| Description | International standards | British standards |
|---|---|---|
| Cold crushing strength | 180Mpa | 26,107psi |
| Refractoriness under load 2 105Pa, 0.5% at | 1,720°C | 3,130°F |
| Coefficient of thermal expansion | 8.5 10-6K-1 | 4.7 10-6°F-1 |
| Thermal conductivity at 1,000°C | 2.6W.m-1.K-1 | 18BTU in hr-1ft-2°F-1 |
| Thermal shock resistance | very good | very good |
| Porosity | 15% | 15% |
| Typical bulk density | 3.54g/m3 | 221pcf |
Storage
The sintered 50% chrome-alumina, WOOL 50 solution must be stored in a dry environment protected from weather conditions.