Zhengzhou Highland Refractory manufactures a complete series of Silica Bricks (SiO₂ ≥93%–96%) engineered specifically for acid-environment, high-temperature applications.
Our silica brick grades cover the full service spectrum: from SK-34 standard profiles for hot blast stoves to high-density SK-40 grades for glass tank furnace crown linings. Each production batch undergoes load softening point testing (≥1650°C) and SiO₂ purity verification. We supply standard ISO sizes and custom-profiled bricks for complex furnace geometries.
Factory direct. MOQ 5 tons. 2026 bulk pricing available on request.
Silica bricks, made primarily from high-purity silica (SiO₂), are among the most critical refractory materials used in high-temperature industrial processes.
Silica bricks, made primarily from high-purity silica (SiO₂), are among the most critical refractory materials used in high-temperature industrial processes.
Silica brick performance varies significantly by SiO₂ content, apparent porosity, and load softening point. Match your furnace type to the correct grade below.
| Furnace / Application | Recommended Grade | SiO₂ Content | Load Softening Point | Key Requirement |
|---|---|---|---|---|
| Coke Oven | SK-38 / SK-40 | ≥95% | ≥1680°C | Volume stability, creep resistance |
| Glass Tank Furnace Crown | SK-40 Dense | ≥96% | ≥1700°C | Low porosity, no glass contamination |
| Hot Blast Stove | SK-34 / SK-36 | ≥93% | ≥1650°C | Thermal cycling resistance |
| Ceramic / Tunnel Kiln | SK-34 Standard | ≥93% | ≥1640°C | Cost-effective, acid slag resistance |
Backed by decades of expertise, Highland Refractory delivers tailored refractory brick solutions across steel, cement, glass, and petrochemical industries. Trusted by global manufacturers, our products ensure long service life, efficiency gains, and cost savings—with on-site technical support to guarantee optimal performance for every client.
The crown and superstructure of a float glass or container glass furnace operate continuously at 1580–1650°C under corrosive alkali vapor (Na₂O, K₂O). Standard refractories contaminate the glass melt and degrade within months under these conditions. Highland's SK-40 Dense Grade silica brick (SiO₂ ≥96%, apparent porosity ≤18%) delivers a near-zero contamination profile and maintains dimensional stability through a full campaign life of 8–12 years. Its ultra-low iron content (<0.3% Fe₂O₃) is critical for preventing glass discoloration in high-clarity float glass production. Custom crown arch profiles are available to match your furnace geometry with dimensional tolerance ±0.5mm.
Coke oven heating walls cycle between 1250°C and 1450°C thousands of times over a campaign life spanning 25–30 years. The primary failure mode is creep deformation — walls bow inward under sustained thermal load, jamming the coke-pushing machine and triggering costly unplanned downtime. Highland's SK-38 / SK-40 coke oven grade silica brick is engineered with a controlled cristobalite-tridymite phase ratio that minimizes volume change above 600°C, delivering a creep rate of ≤0.5% at 1600°C × 50h. Consistent brick geometry with dimensional tolerance ±0.5mm ensures tight joint integrity throughout the campaign, preventing gas leakage between heating cells.
The dome and upper combustion chamber of a blast furnace hot blast stove alternate between blast and on-gas cycles at 1300–1450°C, creating severe thermal shock conditions that cause conventional bricks to spall and crack prematurely. Highland's SK-34 / SK-36 hot blast stove grade leverages the unique low thermal expansion characteristic of silica above 600°C — a result of the cristobalite-tridymite polymorphic transition — to absorb cycling stress without structural damage. With thermal conductivity of 1.2–1.5 W/(m·K) at 1000°C, it maintains efficient heat transfer to the blast air, directly supporting hot metal production output and energy efficiency targets.
Roof structures in ceramic tunnel kilns and shuttle kilns must simultaneously bear their own suspended weight at 1250–1380°C while resisting alkali flux vapor (K₂O, Na₂O) rising from ceramic ware below. Conventional bricks in this position suffer arch sagging and flux penetration, leading to structural failure and contamination of high-value ceramic products. Highland's SK-34 Standard Grade silica brick offers the optimal cost-performance balance for this environment: a load softening point of ≥1640°C prevents arch deformation under sustained load, while the dense silica matrix resists alkali flux infiltration without requiring premium-grade material costs. Custom arch and wedge profiles are available for both straight and curved kiln roof geometries.
Highland's silica bricks are produced from premium quartzite ore with SiO₂ content controlled at ≥93%–96% across all grades. Higher purity directly translates to a higher load softening point (≥1650°C–1700°C) and superior resistance to acid slag attack. For glass furnace operators, this means crown linings that last 8–12 years without contaminating the melt. For coke oven managers, it means heating walls that hold dimensional stability through 25–30 years of thermal cycling — eliminating the premature replacement costs that erode profitability.
The critical failure risk of silica brick is uncontrolled polymorphic phase transformation below 600°C, which causes sudden volume expansion and structural cracking during heat-up. Highland's sintering process precisely controls the cristobalite-tridymite ratio in each batch, ensuring stable phase composition and minimizing residual quartz content to ≤1.5%. The result: safe, predictable thermal expansion behavior during kiln commissioning and scheduled shutdowns — protecting both your refractory lining and your furnace shell from expansion-induced damage.
In coke ovens and glass furnaces, even a 0.5mm dimensional deviation accumulates across hundreds of bricks, creating gaps that allow gas leakage, heat loss, and accelerated corrosion at joint faces. Highland operates CNC grinding and precision mold pressing to hold dimensional tolerances of ±0.5mm across all standard and custom profiles — including wedge, arch, and keystone shapes. Every batch undergoes dimensional inspection before shipment, with full measurement records issued per order. Tight bricks mean tight joints, and tight joints mean longer campaign life.
Industrial furnace projects rarely need just one brick shape. Highland supplies the complete silica brick series — SK-34 / SK-36 / SK-38 / SK-40 standard and dense grades — alongside custom-profiled bricks for crowns, arches, walls, and expansion joints, all from a single manufacturing facility. This eliminates multi-supplier coordination risks: inconsistent raw material batches, mismatched thermal expansion coefficients, and split quality accountability. One supplier, one certificate, one point of contact for your entire furnace refractory package.
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
Silicon carbide castable is an amorphous refractory material with silicon carbide as the main component.
Fused AZS bricks are produced through a high-temperature fusion casting process, where precisely controlled proportions of Al₂O₃ (alumina), ZrO₂ (zirconia), and SiO₂ (silica) are melted and cast into dense refractory blocks. Unlike sintered refractory bricks, fused AZS bricks feature: Extremely low porosity Dense microstructure Superior resistance to glass penetration Stable performance at temperatures up to 1550–1600°C
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.
