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JM Series Heat Insulation Refractory Brick (JM23/JM26/JM28/JM32) - Lightweight & High-Temp Resistant For Industrial Kilns
Our JM Series Heat Insulation Refractory Bricks (JM23/JM26/JM28/JM32) are premium thermal insulation materials crafted from high-purity diatomite and low-iron clay. They feature ultra-lightweight (bulk density 0.8-1.2g/cm³), excellent heat insulation (thermal conductivity ≤0.28 W/m·K at 350℃), and reliable high-temperature performance (refractoriness 1250-1400℃). Designed to solve pain points like high energy consumption of ordinary bricks, heavy structural load, and poor thermal stability, they’re widely used as backup lining in ceramic, glass, and metallurgy industry kilns/furnaces. Backed by ISO 9001 certification and 5000 tons monthly capacity, we offer factory-direct pricing ($120-$380/ton) and full customization to meet global industrial heating demands.
Description
1. Product Overview
The JM Series Heat Insulation Refractory Bricks are manufactured via advanced processes: high-purity diatomite selection (Fe₂O₃ ≤1.5% to avoid contamination), organic pore-forming agent addition (to create uniform micro-pores), vacuum extrusion molding (ensuring dense structure), low-temperature drying (120℃), and high-temperature sintering (1300-1450℃). Unlike dense refractory bricks, their porous structure reduces bulk density to 0.8-1.2g/cm³ (30-40% lighter than ordinary dense bricks), while maintaining cold crushing strength ≥3.0MPa-balancing lightweight and structural stability. The series includes 4 grades (JM23/JM26/JM28/JM32) with different Al₂O₃ contents and refractoriness, supplied in standard size (230×114×65mm) with fumigated wooden pallets + plastic film packaging, and supports custom shapes/sizes.
2. Key Features
Grade-Specific Performance:
JM23: Al₂O₃ ≥23%, refractoriness 1250℃, ideal for 1000℃ medium-temp kilns (e.g., ceramic drying kilns).
JM26: Al₂O₃ ≥26%, refractoriness 1300℃, fits 1100℃ scenarios (e.g., glass annealing furnaces).
JM28: Al₂O₃ ≥28%, refractoriness 1350℃, suitable for 1200℃ environments (e.g., steel reheating furnaces).
JM32: Al₂O₃ ≥32%, refractoriness 1400℃, designed for 1300℃ high-temp zones (e.g., cement kiln preheaters).
Superior Thermal Insulation: Thermal conductivity ≤0.28 W/m·K at 350℃-reduces kiln heat loss by 20-25%, cutting fuel costs significantly.
Lightweight & Low Load: Bulk density 0.8-1.2g/cm³, single brick weight (230×114×65mm) ≤4.5kg-lowers kiln steel structure load by 30%, saving infrastructure costs.
Stable Volume & Durability: Reheating linear change ≤1.5% at 1200℃-withstands long-term thermal cycles without deformation, service life 2-3x longer than ordinary insulation bricks.
Easy Installation & Customization: Lightweight design speeds up installation; supports shape (wedge/arch/split) and size customization (MOQ 5 tons) with 5-day sample delivery.
3. Technical Parameters
| Parameter | JM23 | JM26 | JM28 | JM32 |
|---|---|---|---|---|
| Al₂O₃ Content (%) | ≥23 | ≥26 | ≥28 | ≥32 |
| Fe₂O₃ Content (%) | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 |
| Bulk Density (g/cm³) | 0.8-1.0 | 0.9-1.1 | 1.0-1.15 | 1.1-1.2 |
| Cold Crushing Strength (MPa) | ≥3.0 | ≥3.5 | ≥4.0 | ≥4.5 |
| Thermal Conductivity (350℃) | ≤0.28 | ≤0.29 | ≤0.30 | ≤0.32 |
| Refractoriness (℃) | ≥1250 | ≥1300 | ≥1350 | ≥1400 |
| Reheating Linear Change (1200℃, 2h) (%) | ≤1.5 | ≤1.2 | ≤1.0 | ≤0.8 |
| Working Temperature (℃) | ≤1000 | ≤1100 | ≤1200 | ≤1300 |
| MOQ | 1 ton (standard); 5 tons (custom) | Same as left | Same as left | Same as left |
4. Application Scenarios
Ceramic Industry: JM23 for drying kiln linings, JM26 for firing kiln backup insulation-low iron content prevents ceramic discoloration, lightweight design reduces kiln load.
Glass Industry: JM28 for glass melting furnace flue insulation, JM32 for high-temp preheater lining-excellent heat insulation reduces natural gas consumption.
Metallurgy Industry: JM28 for steel annealing furnace hot-face lining, JM32 for copper smelter backup insulation-refractoriness fits 1200-1300℃ working temps.
Building Materials Industry: JM26 for cement kiln cooler insulation, JM32 for lime kiln top lining-stable volume avoids structural deformation.
5. Service & Support
Customization Service: Supports grade adjustment (JM23-JM32), shape (wedge/arch/split), and size customization (MOQ 5 tons); Fe₂O₃ content can be adjusted to ≤1.0% for high-purity scenarios-5 days to deliver sample drawings.
Pricing & Discounts: Tiered pricing: JM23 ($120-$150/ton), JM26 ($150-$200/ton), JM28 ($200-$300/ton), JM32 ($300-$380/ton); $50 off for $1000+ orders, bulk orders (≥50 tons) enjoy 8-12% discounts.
Samples & Quality Assurance: Free 10pcs samples provided (customer covers shipping); each batch undergoes 100% inspection (density, strength, refractoriness) with test reports; 1-year quality warranty.
Delivery & Packaging: 1-30 tons shipped within 10 days, bulk orders (>30 tons) negotiable; standard packaging: fumigated wooden pallets + plastic film; shipped via major ports (FOB/CIF terms available).
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