Highland Refractory, a trusted supplier of premium AZS Refractory Brick, offers high-performance AZS Brick—engineered from zirconia-alumina-silica (ZrO₂-Al₂O₃-SiO₂) composites for extreme high-temperature and corrosive environments. Our product line includes AZS 33 brick (33% ZrO₂ content), AZS 36 brick (36% ZrO₂), and AZS 41 brick (41% ZrO₂), each designed to withstand continuous operating temperatures up to 1800℃ with exceptional thermal shock resistance and corrosion resistance against molten glass, slags, and acids.
Fused Cast AZS (Alumina-Zirconia-Silica) blocks are the ultimate refractory solution for glass melting furnaces, offering unparalleled resistance to molten glass corrosion and severe high temperatures. Manufactured via electric arc fusion at over 1900°C, Highland Refractory supplies the complete range of AZS-33#, AZS-36#, and AZS-41# blocks, engineered to extend your furnace campaign life and eliminate glass contamination.
Table of Contents: AZS Block Specifications
The performance of an AZS block is determined by its Zirconia (ZrO&sub2;) content. We supply three primary grades tailored for specific thermal and corrosive loads within the furnace.
| Property | AZS-33# (Standard) | AZS-36# (Enhanced) | AZS-41# (Premium) |
|---|---|---|---|
| ZrO&sub2; Content (%) | ≥ 33 | ≥ 36 | ≥ 41 |
| Al&sub2;O&sub3; Content (%) | ≈ 50 | ≈ 48 | ≈ 45 |
| SiO&sub2; Content (%) | ≈ 14 | ≈ 13 | ≈ 12 |
| Bulk Density (g/cm³) | ≥ 3.40 | ≥ 3.60 | ≥ 3.85 |
| Apparent Porosity (%) | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Cold Crushing Strength (MPa) | ≥ 300 | ≥ 320 | ≥ 350 |
| Primary Furnace Zone | Superstructure, End Walls | Melter Sidewalls, Paving | Throat, Doghouse |
Why invest in fused cast AZS blocks over traditional refractory bricks? The answer lies in the extreme environments of a glass tank where standard sintered refractories rapidly dissolve.
Highland's AZS blocks are customized for the specific wear mechanisms present in high-temperature melting equipment:
AZS 36# & 41# are deployed in the melter sidewalls and bottom paving to resist heavy alkali vapor and dynamic glass flow. AZS 33# is utilized in the superstructure and feeder channels to maintain glass purity.
These kilns generate highly aggressive corrosive environments. The throat and doghouse corners exclusively require AZS 41# (ZWS void-free casting) to prevent catastrophic refractory washout.
Sodium silicate melts are severely basic and corrosive. The dense, interlocking zirconia-corundum crystal structure of our AZS blocks provides the only reliable barrier against this extreme fluxing action.
Because fused cast blocks require massive electricity consumption for arc melting and diamond CNC machining for final tolerances, they are priced per ton based on the Zirconia content and the required casting method (which determines the yield rate).
B2B Wholesale Price Range (FOB China):
*Pricing variables: Prices fluctuate based on the casting method required (PT/Normal cast is cheaper than ZWS/Void-Free cast), custom block geometry, pre-assembly requirements, and raw material index costs. Contact us with your drawings for an exact quotation.
Highland's AZS blocks are trusted in major glass manufacturing hubs globally. Here are recent examples of our engineering deployments:
Due to the slow, controlled annealing process required to prevent cracking in fused cast materials, standard lead times are typically 45 to 60 days, depending on casting volume and geometric complexity.
All fused cast materials shrink as they solidify, creating an internal void. PT casting leaves this void inside the block (acceptable for superstructures). ZWS casting shifts the void entirely into a riser that is cut off, yielding a 100% dense block — mandatory for high-erosion areas like the throat.
Yes. For critical assemblies like doghouses, throats, and multi-tier sidewalls, we conduct 100% factory pre-assembly, match-mark every block, and provide an installation map to guarantee seamless on-site construction.
Yes, this is standard practice to optimize CAPEX. Use the premium 41# only in the most severe wear zones (throat, doghouse corners), 36# for the main flux line, and 33# for upper superstructures where corrosion is lower.
AZS blocks have a bulk density near 4.0 g/cm³. We pack them in heavy-duty, fumigated ISPM-15 wooden crates reinforced with steel bands. Internal shock-absorbing foam prevents edge chipping during ocean transit.
Send us your glass furnace refractory layout. Our engineering team will review the block dimensions, recommend the appropriate casting method, and provide a detailed quotation including export logistics.
Aluminum content 75%-80% Refractory 1770℃ or above
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
