Glass furnace refractories carry a chemistry problem as much as a temperature problem: molten glass at 1500 °C dissolves silicates and alumino-silicates progressively, alkali volatiles condense on cooler brickwork and drive expansion, thermal cycling stresses joint geometry, and the tank must run for years without an unscheduled outage. The refractory called for by the specific glass composition (soda-lime, borosilicate, container, float, tableware, industrial) and by the specific zone (tank sidewalls, breastwalls, crown, regenerator, forehearth, feeder, throat) is what determines campaign life.
For glass service, Ellite Materials supplies refractories where mullite-bonded and high-alumina chemistries carry the service — regenerator packing, superstructure and back-up applications, forehearth channels, and feeder-related shapes. The specialty fused-cast AZS refractories used in the primary melt zone of container and float furnaces are sourced through separate specialists; the Ellite Materials range complements those in the ancillary and back-up zones, and in the many industrial-glass applications where high-alumina and mullite chemistries fit the service.
Where our glass-industry refractories go
Tank furnace — superstructure and back-up
- Crown and roof — mullite-bonded and high-alumina castables and precast shapes for zones out of direct molten-glass contact. Alkali resistance, hot creep resistance and low permeability guide grade selection.
- Breastwalls and sidewalls (back-up) — dense high-alumina brick and monolithic linings behind the primary glass-contact refractories.
- Refractory-lined ports and burners — dense high-alumina castables and precast shapes drawn to plant geometry.
Regenerator chambers
- Regenerator packing — mullite-bonded brick and shaped refractories engineered against the alkali-and-sulphate-laden reversing gas flow.
- Regenerator crown and division walls — high-alumina, low-permeability grades sized for heat-recovery service and the mechanical loads on chamber structure.
- Rider arches — precast high-alumina shapes for structural support of the packing.
Forehearth and working end
- Forehearth channel refractories — high-alumina castables and precast shapes for the working end of container, tableware and industrial-glass operations.
- Forehearth roof and superstructure — mullite-bonded castables for the enclosure over the working glass stream.
Feeder and orifice-adjacent
- Feeder tube and orifice-ring back-up — high-alumina castables and precast shapes surrounding the specialty forming refractories.
- Anchoring and joint refractories — mortars and rammable mixes for the fixings and joints between shapes.
The glass-industry wear mechanisms we formulate against
- Molten-glass corrosion — dissolution of alumino-silicates by the primary glass melt at temperature. Managed by matching refractory chemistry to zone and by placing our refractories in back-up, ancillary and above-metal-line zones where corrosion is manageable.
- Alkali volatile attack — Na₂O, K₂O, B₂O₃ vapours volatilise in the melt and re-condense on cooler brickwork as feldspathoid phases, driving expansion, spalling and disintegration. Mullite-bonded, low-porosity grades resist feldspathoid formation.
- Thermal cycling and shock — regenerator reversal cycles impose 15–30 minute thermal cycles; forehearth service brings continuous temperature-band-holding. Aggregate hardness and matrix engineering deliver thermal-shock survival.
- Sulphate attack — SO₂ / SO₃ from fuel and batch cycles condense to sulphates on refractory surfaces. Low-CaO ULCC and NCC grades resist sulphate reactivity.
- Bulk-density and porosity control — glass service penalises open porosity; grade selection targets low apparent porosity through the sintering programme.
- Batch dust abrasion — cullet, sand, soda ash and dolomite dust abrades refractory surfaces at ports and around charge zones. Aggregate hardness controls abrasion resistance.
Documentation, QC and technical service
Every consignment carries a certificate of analysis with chemistry and physical properties for the grade supplied. Alkali resistance data and permeability values are available on request for grades destined for regenerator and superstructure service. Application engineers walk the tank at planned outage, examine the specific zone geometry, and specify against what they see.
Complementary raw materials for the glass supply chain
Glass-industry refractory formulators procure Bajaj Ceramull refractory-grade kyanite for controlled expansion, Bajaj Mullite 60 sintered mullite as the aggregate of choice for mullite-bonded regenerator and superstructure grades, and fused silica for thermal-shock-critical zones. These raw materials are produced at the Bangalore plant and supplied in parallel to formulator customers, as well as consumed in Ellite Materials' own monolithic and precast production.
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Why Ellite Materials for glass-industry refractories
Aggregate-up formulation. Mullite-bonded refractories for glass service are built on BMULL60 and Bajaj Ceramull kyanite produced in-house. Aggregate consistency, lot-to-lot chemistry and matrix packing decisions are made under one roof.
50,000 MT per annum combined installed capacity across refractory raw materials and monolithic refractories. Supply reliability at the tonnages glass operations consume across continuous campaigns.
QC laboratory with the tests buyers cite. Chemistry, phase analysis, particle-size distribution, bulk density, apparent porosity, cold and hot strength, permanent linear change on reheat, thermal expansion and alkali-attack cup testing on request.
Application engineering at the plant. Site walk-downs of tanks, regenerator chambers, forehearths and feeder zones; bake-out and preheat schedules; hot-repair support at planned outages; post-mortem lining analysis to inform the next campaign.
Talk to our glass-industry technical team
Send the zone (regenerator packing, superstructure, forehearth, feeder back-up), the glass composition (soda-lime, borosilicate, container, float, tableware, industrial), the tank capacity and campaign-life target, and any specific reliability or quality problem you would like the next refractory to solve.
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