FUSED CAST AZS BLOCKS
Melt-cast alumina-zirconia-silica blocks for glass furnace contact zones with exceptional corrosion resistance
PRODUCT OVERVIEW
Fused cast AZS (Alumina-Zirconia-Silica) blocks are produced by melting the oxide blend above 1800°C and casting it into dense, near-zero-porosity blocks. The zirconia content (33–41% ZrO₂) gives outstanding resistance to molten glass corrosion, making AZS the standard for glass tank sidewalls, throat and paving. Void-free (VF) casting types minimise glass defects (stones, blisters) in high-quality glass.
KEY PROPERTIES
ZrO₂ Content
33 – 41%
Max Service Temp
Up to 1700°C
Bulk Density
3.4 – 4.0 g/cc
Glass Corrosion
Outstanding
Apparent Porosity
Very low (1 – 3%)
Cast Types
VF (void-free), QX, WS
APPLICATIONS
TECHNICAL SPECIFICATIONS
| Grade | ZrO₂ | Al₂O₃ | Bulk Density | Max Temp |
|---|---|---|---|---|
| AZS-33 | 32-34% | 50-52% | 3.40 g/cc | 1500-1700°C |
| AZS-36 | 35-37% | 48-50% | 3.65 g/cc | 1500-1700°C |
| AZS-41 | 40-42% | 45-47% | 4.00 g/cc | 1500-1700°C |
* Test conditions: IS 1528 (India) / ASTM C-133 / EN 1402. Values are typical — exact data sheets available on request.
AVAILABLE GRADES
INSTALLATION NOTES
- 1
Heavy blocks — handle with rated lifting equipment and protect cast faces
- 2
Use zircon-based or AZS-compatible bedding mortar at joints
- 3
Plan controlled furnace heat-up; AZS exudes glassy phase (exudation) on first heat — design joints for it
- 4
Select VF (void-free) grade where glass quality (stone/blister-free) is critical
WHY BUY FROM SHANKER AGENCIES
Shanker Agencies supplies Calderys fused cast AZS blocks cut and sized to glass-furnace drawings. We advise on grade (33/36/41) and cast type by glass type, pull rate and tank zone.
PARTNER BRANDS
FREQUENTLY ASKED QUESTIONS
AZS stands for Alumina-Zirconia-Silica — the three main oxides in the block. Fused cast AZS is produced by melting the oxide blend above 1800°C and casting it into dense, near-zero-porosity blocks. The zirconia content (33–41% ZrO₂) is what gives the exceptional resistance to molten glass corrosion that makes AZS the standard for glass furnace contact zones.
QUICK INFORMATION
Max Temperature
1700°C
Category
Shaped Refractories
Grades Available
4 Standard Grades
Industries Served
Brands We Supply
• Calderys
• CUMI
📦 Quick Delivery
Standard grades in stock — Delhi warehouse. Pan-India delivery in 2–5 days. Same-day dispatch for urgent orders ≤ 2 MT.
MORE IN SHAPED REFRACTORIES
Mullite Bricks
High-creep-resistance mullite bricks for blast furnace stoves, glass regenerators and kiln furniture
Andalusite Bricks
Volume-stable andalusite bricks that mullitise in service for stoves, reheating furnaces and kilns
Zircon Bricks
Sintered zircon (ZrSiO₄) bricks for glass tank paving, throat and slide-gate inserts
Alumina-Carbon Bricks
Graphite-bonded alumina-carbon bricks for steel ladle walls, slag zones and impact pads
READY TO ORDER OR NEED A SAMPLE?
Our engineers can recommend the exact grade for your application. Sample kits available for trials. No minimum order on standard grades.