AZS stands for Alumina‑Zirconia‑Silica. "33" refers to approximately 33 wt% zirconia (ZrO₂) content within the block. Balancing molten glass corrosion resistance, thermal stability and cost‑performance, this grade shows a relatively low tendency to generate stones, bubbles or matrix glass phase precipitation in glass melt. It is widely adopted in glass melting furnaces.
It is mainly used for molten glass contact areas of glass furnaces, including furnace side walls, doghouse, throat, channel, feeder and forehearth. It fits soda‑lime glass, float glass and container glass production. It is not recommended for ultra high alkali glass or special glass containing aggressive components.
Production, Payment and Delivery
Most Dezhong fused cast refractory products are customized according to approved drawings and glass furnace position requirements. Production starts after final drawing confirmation and receipt of advance payment. Normal production lead time is around 40 days, depending on product type, quantity, brick shape, machining requirements and pre-assembly scope.
Before shipment, customers may arrange inspection or acceptance review according to the order agreement. After the inspection is completed and the balance payment is settled before shipment, we will proceed with export packing and deliver the goods to the agreed port for shipment.
Our standard export packing includes fumigated wooden pallets or wooden cases, plastic film wrapping, steel band fixing, shipping marks, labels and packing list identification. Reinforced packing can be arranged for large-size blocks, special shapes or fragile products.
Before shipment, Dezhong can support pre-shipment inspection according to the agreed order requirements. Inspection may include:
- Appearance inspection
- Dimensional inspection
- Quantity confirmation
- Packing and shipping mark confirmation
- Packing list check
- Quality document review
- Pre-assembly verification when required
- Internal inspection or testing records for critical glass-contact blocks when agreed
FAQ
Q: What is the difference between AZS 33, AZS 36 and AZS 41 fused cast grades?
A: Higher zirconia content brings better glass‑corrosion resistance. AZS‑33 is cost‑effective for general glass contact positions; AZS‑36 and AZS‑41 are selected for heavy‑erosion zones such as bottom corner and intense flow areas, where longer campaign life is required.
Q: What is the core service limitation of AZS 33 (33% ZrO₂) in actual furnace operation?
A: Its limiting factor is 12‑14% residual intergranular glass phase instead of zirconia content. This phase softens above 1400°C. Continuous operation above 1520°C accelerates exudation, creep and glass penetration, resulting in premature wear. AZS 33 is recommended for long‑term service temperature ≤1500°C.
Q: Which glass compositions are chemically incompatible with AZS 33?
A: AZS 33 works well for conventional soda‑lime float and container glass. Avoid high‑alkali borate, phosphate and high‑lead glass. These form low‑melting eutectics with the brick matrix and multiply erosion rate by 3‑5 times.
Hot Tags: fused cast azs 33 blocks, China fused cast azs 33 blocks manufacturers, suppliers, factory, Magnesia Refractory Bricks, Fused Cast AZS 36 Blocks, Fused Cast AZS 33 Blocks, Fused Cast AZS 41 Blocks, Fused Silica Brick, Chrome Corundum Brick
