CRA
Mullite material
CRA is well adapted to increase lifetime of Danner mandrels and reduce glass defects. CRA has better surface quality compared to other materials.
Typical application
- danner mandrels (lighting and pharmaceutical tubes).
Due to its low thermal shock resistance, CRA needs an adapted heating-up.
Chemical and physical properties
Typical chemical composition
Typical crystallographic analysis
Main phase:
- mullite
Secondary phase:
- corundum
- silicate
Physical characteristics
| Description | International standards | British standards |
|---|---|---|
| Typical bulk density | 2.30g/cm3 | 143pcf |
| Open porosity | 25% | 25% |
| Refractoriness under load 2 105 Pa, 0.5% at | 1,600°C | 2,912°F |
| Coefficient of thermal expansion | 5.5 10-6K-1 | 3 10-6°F-1 |
| Thermal conductivity at 1,000°C | 1.4 W.m-1.K-1 | 9.7 BTU in hr-1 ft-2°f-1 |
| Thermal shock resistance | poor | poor |
Storage
The mullite material, CRA solution must be stored in a dry environment protected from weather conditions.
Expendables Catalog
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