Typical application
ZS78 is used in glass contact areas of the furnace where thermal cycling or gradients cause traditional refractories to crack, thereby affecting refractory life or glass quality. These areas include melter sidewalls (particularly batching areas), bottom paving, refiners, forehearths, flow blocks and bushing blocks. Due to its fine grain structure, ZS78 is an excellent choice for use as bushing blocks in manufacturing very small diameter glass fibers.
ZS78 should also be used wherever seeds or blisters represent a quality problem. Glasses include reinforcement and textile fiber glass, borosilicates, glass ceramics, low-alkali compositions and other technical compositions.
Chemical and physical properties
Microstructure
Typical chemical composition
Typical crystallographic analysis
Main phase: zircon
Physical characteristics
| Description | International standards | British standards |
|---|---|---|
| Cold modulus of rupture | 38Mpa | 5,511psi |
| Cold crushing strength | 300Mpa | 43,511psi |
| Thermal conductivity at 1,000°C | 3.1 W.m-1.K-1 |
21.5 BTU |
| Porosity | 10% | 10% |
| Typical bulk density | 4.20g/cm3 | 262pcf |
Storage
The sintered dense zircon, ZS78 solution must be stored in a dry environment protected from weather conditions.