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Factory-Price Alumina Hollow Ball Insulating Brick - High-Temp Resistant (1680-1800℃) For Extreme Industrial Scenarios
Our Alumina Hollow Ball Insulating Brick is a premium ultra-high-temperature insulation material, crafted from high-purity α-Al₂O₃ (85%-99%) via electric furnace smelting and blowing. It features exceptional heat resistance (max service temp 1680-1800℃), ultra-lightweight (bulk density 1.4-1.7g/cm³), and low thermal conductivity (≤0.3-1.5 W/m·K at 800℃). Designed to solve pain points like insufficient high-temp resistance of ordinary insulation bricks, heavy furnace load, and high energy consumption, it’s widely used in extreme-temperature industrial equipment such as petrochemical cracking furnaces, ceramic tunnel kilns, and aerospace high-temp test chambers. Backed by CE certification, TüVRheinland verification, and 20 years of refractory experience, we offer factory-direct pricing ($450-$500/ton, 10% off) and free customization to meet global high-end industrial heating demands.
Description
1. Product Overview
This Alumina Hollow Ball Insulating Brick is manufactured via advanced processes: high-purity industrial alumina smelting in electric furnaces (1800-2000℃ to form molten alumina), high-pressure air blowing (to create hollow α-Al₂O₃ microspheres), graded screening (to control hollow ball size 0.1-3mm), mixing with ultra-fine alumina powder, high-pressure molding (800-1200 tons press), and high-temperature sintering (1600-1700℃ to enhance structural stability). Unlike traditional dense refractory bricks, its unique hollow ball structure reduces bulk density to 1.4-1.7g/cm³ (40%-50% lighter than ordinary high-alumina bricks) while maintaining cold crushing strength ≥8MPa-achieving a balance between "ultra-high temp resistance" and "lightweight insulation". The product covers 3 core grades by Al₂O₃ content (85%/90%/99%) and supports custom shapes, supplied in standard size (230×114×65mm) with fumigated wooden pallets (930×930mm, 1.5-2.0 tons/pallet) for secure transportation.
2. Key Features
Ultra-High Temp Resistance: Max service temp 1680-1800℃ (zirconia type up to 2200℃), refractoriness under load (0.1MPa, 0.6%) ≥1650℃-withstands long-term operation in petrochemical cracking furnaces (1700℃) and ceramic kiln firing zones (1680℃) without softening or decomposition.
Efficient Insulation & Lightweight: Bulk density 1.4-1.7g/cm³ (single brick weight ≤8kg for 230×114×65mm), reducing furnace structural load by 40%; thermal conductivity ≤0.3-1.5 W/m·K (800℃)-lowering equipment heat loss by 30% and cutting fuel/electricity consumption by 25%.
Stable Volume & Durability: Reheating linear change ±0.3% (1600℃, 3h), thermal expansion coefficient 7.8-9.0×10⁻⁶/℃-resisting frequent thermal shocks (1600℃→25℃ water quenching ≥15 cycles) and ensuring long service life (3-5 years, 2× longer than ordinary high-alumina bricks).
High Purity & Corrosion Resistance: Al₂O₃ 85%-99%, Fe₂O₃ ≤0.2%, SiO₂ ≤0.2%-13%-avoiding contamination of high-purity products (e.g., semiconductor materials, aerospace components); excellent resistance to acid/alkali slag (except molten alkali) and metal melt erosion.
Factory Price & Flexible Customization: No middlemen, direct factory pricing ($450/ton for 1 ton MOQ, 10% off); supports logo, packaging, and shape/size customization (MOQ 10 tons) with 7-day sample delivery-adapting to irregular equipment structures like furnace arches and pipeline elbows.
3. Technical Parameters
| Parameter | 85% Al₂O₃ Grade | 90% Al₂O₃ Grade | 99% Al₂O₃ Grade | Zirconia Grade (Optional) |
|---|---|---|---|---|
| Al₂O₃ Content (%) | ≥85 | ≥90 | ≥99 | - |
| ZrO₂ Content (%) | - | - | - | ≥98 |
| SiO₂ Content (%) | ≤13 | ≤8 | ≤0.2 | ≤0.2 |
| Fe₂O₃ Content (%) | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 |
| Max Service Temp (℃) | 1680 | 1700 | 1800 | 2200 |
| Bulk Density (g/cm³) | 1.4-1.7 | 1.4-1.7 | 1.4-1.7 | ≤3.0 |
| Cold Crushing Strength (MPa) | ≥12 | ≥10 | ≥9 | ≥8 |
| Refractoriness Under Load (0.1MPa, 0.6%) (℃) | ≥1650 | ≥1700 | ≥1700 | ≥1700 |
| Reheating Linear Change (1600℃, 3h) (%) | ±0.3 | ±0.3 | ±0.3 | ±0.3 |
| Thermal Conductivity (800℃) (W/m·K) | ≤0.8 | ≤1.3 | ≤1.5 | ≤0.3 |
| Thermal Expansion Coefficient (Room Temp-1300℃) (10⁻⁶/℃) | ~7.8 | ~8.0 | ~8.6 | ~9.0 |
| Standard Size | 230×114×65mm (customizable) | Same as left | Same as left | Same as left |
| MOQ | 1 ton (standard); 10 tons (customization) | Same as left | Same as left | Same as left |
4. Application Scenarios
Petrochemical Industry: Cracking furnace linings and high-temp reactor insulation-99% Al₂O₃ grade withstands 1800℃, ensuring stable operation of ethylene cracking equipment.
Ceramic/Glass Industry: Tunnel kiln firing zones and glass melting furnace roofs-85% Al₂O₃ grade balances cost and performance, reducing kiln energy consumption by 25%.
Aerospace & Metallurgy: High-temp test chambers and rare metal smelting furnaces-zirconia grade (2200℃) adapts to extreme temp environments, protecting sensitive test components.
Environmental Protection & Energy: Waste incinerator secondary combustion chambers and solar thermal power generation receivers-corrosion resistance avoids damage from acidic flue gas, lightweight design reduces equipment load.
5. Service & Support
Customization Service: Free customization of Al₂O₃ content (85%-99%), shape (wedge/arch/split), and size (e.g., 230×57×65mm split brick) with MOQ 10 tons; logo and packaging customization (no extra cost) - 7 days to deliver sample drawings.
Pricing & Discounts: Factory-direct tiered pricing: 1 ton ($450/ton, 10% off original $500), 10-49 tons ($420/ton), ≥50 tons ($390/ton); $80 off for $1000+ orders-lower cost for bulk purchases.
Samples & Quality Assurance: Free 5pcs samples provided (customer covers shipping); each batch undergoes 100% inspection (density, temp resistance, thermal conductivity) with test reports; 1-year quality warranty (free replacement for defects like cracking or temp resistance failure).
Delivery & Packaging: 1 ton shipped within 7 days, bulk orders (>1 ton) with negotiable lead time; standard packaging: fumigated wooden pallets (930×930mm, 1.5-2.0 tons/pallet) + plastic film (moisture-proof); shipped via Qingdao/Tianjin ports (FOB/CIF terms available).
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