BPMA
Corundum material
Product only used for orifice rings when a zirconia-free product is requested.
Typical application
- orifice rings
BPMA is recommended for sodalime container glass and flask tableware.
Chemical and physical properties
Typical chemical composition
Typical crystallographic analysis
Main phase:
- corundum
Physical characteristics
| Description | International standards | British standards |
|---|---|---|
| Typical bulk density for orifice rings | 2.77g/cm3 | 173pcf |
| Open porosity for orifice rings | 20% | 20% |
| Coefficient of thermal expansion | 7.5 10-6K-1 | 4.1 10-6°F-1 |
| Thermal shock resistance | good | good |
Storage
The corundum material, BPMA solution must be stored in a dry environment protected from weather conditions.
Expendables Catalog
Related products
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Bonded alumina-zirconia-silica (AZS) with 10% zirconia
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Bonded alumina-zirconia-silica (AZS) with 20% zirconia
ZIRAL 61 is recommended for all applications in feeder expendables, and for superstructures where high corrosion resistance is required.
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Easy and fast preparation and positioning (5 to 10 min preparation).
R 298 is a refractory-based anti-adhesive powder
Anti-adhesive cement for easy removal of the orifice ring.
Alumina-based granular insulation powder
ORIFICE RING POWDER fills all the spaces between the orifice ring and its holder. The powder has a higher thermal inertness than insulation fibers.