Near-zero thermal expansion and outstanding thermal-shock resistance. Porous electrofused silica handles repeated thermal cycling and direct molten-metal contact without preheating.
Used for: non-ferrous casting · flow-control tubes · float-glass components · steel strip rolling · thermal insulation
Anderman’s porous electrofused silica ES99P combines a maximum operating temperature of 1680 °C with excellent thermal-shock resistance for rapid heat/cool cycling. The combination is extremely beneficial in thermal applications beyond 1200 °C where contact with molten metal or glass produces severe thermal shock.
Fused silica has the lowest thermal expansion of any commodity ceramic (~0.5 × 10⁻⁶/K) and very low thermal conductivity. The result is a material that can be plunged from cold into molten metal without cracking, with minimal heat loss into the part.
Porosity provides high thermal insulation and reduces inclusion pick-up by the melt. Anderman’s manufacturing capability covers exacting dimensional control and sizes from a few centimetres to several metres.
Casting components for non-ferrous metals, control of metal flow into the die, float-glass manufacturing, steel strip rolling, immersion thermocouples and insulating refractory shapes.
| Grade | Purity | Max temp | Density | Hardness | Typical use | Find products |
|---|---|---|---|---|---|---|
| ES99P | 99% SiO₂ | 1680 °C | 2.0 | — | Porous electrofused silica — non-ferrous casting, float glass, steel rolling | → Find products |
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The expansion coefficient is so low (~0.5 × 10⁻⁶/K) that a temperature step of 1000 °C produces almost no thermal strain — so direct contact with molten metal causes no cracking. That removes the preheat step from the process and shortens cycle time.
Anywhere thermal shock dominates over absolute strength or wear — particularly direct molten-metal contact, float-glass internals and steel strip-handling. For sustained mechanical load at temperature, dense alumina remains stronger.
Minimal. High-purity fused silica introduces almost no metallic contamination and the porous body further reduces inclusions reaching the casting, improving final-product quality.
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