Typical application
Mainly used for glass contact, as bottom slabs for melter and distributors, and superstructure application for insulation glass furnaces.
WOOL 30 is made of grains from a unique manufacturing process, the very specific chemical and crystallographic structure provides good corrosion resistance with several others benefits such as :
- smooth corrosion profile,
- lower joint corrosion thru better joint closure after heat-up,
- good electrical resistivity,
For crown application, refer to ZIRCHROM HC.
For electrodes blocks application, refer to ZIRCHROM HER.
WOOL 30 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 | 130Mpa | 18,850psi |
| Refractoriness under load 0.2 MPa T0.5% | 1,720°C | 3,130°F |
| Coefficient of thermal expansion | 8.5 10-6/°C | 4.7 10-6/°F |
| Thermal conductivity at 1,000°C | 2.6W/m.K | 1.5 BTU/h.ft.°F |
| Thermal shock resistance | medium | medium |
| Porosity | 15% | 15% |
| Typical bulk density | 3.3g/cm3 | 212 pcf |
Expansion curve
Thermal conductivity curve
Storage
Specifically designed for insulation glass furnaces, both electrical, gas- and oxygas-fired.