Electric Element Insulation Gasket
Lightweight Mullite SeriesLightweight mullite electric element insulation gaskets and spacers are engineered for high-temperature resistance furnaces and laboratory kilns. They offer outstanding electrical insulation at elevated temperatures, low thermal conductivity, and high mechanical stability.
| Parameter | Specification |
|---|---|
| Material | Lightweight Mullite (JM26 / JM28 / JM30) |
| Max Service Temp | 1350°C ~ 1600°C |
| Bulk Density | 0.8 ~ 1.2 g/cm³ |
| Thermal Conductivity (400℃) | ≤ 0.32 W/(m·K) |
| Cold Crushing Strength | ≥ 2.5 ~ 4.0 MPa |
| Electrical Insulation | High resistivity at high temperatures |
Material Introduction
Lightweight Mullite Electric Element Bricks are fabricated from high-purity synthetic mullite (3Al₂O₃·2SiO₂) through precision molding and high-temperature firing. With alumina content typically ranging from 60% to 75%, they possess superior refractoriness, low thermal expansion, and excellent volume stability.
Serving as critical structural supports and insulating components in electric kilns, they provide reliable load support while maintaining high dielectric strength at operating temperatures up to 1600°C, preventing short circuits and significantly prolonging heating element lifespan.
Product Features
- Superior High-Temperature Insulation: High electrical resistivity eliminates leakage and short circuit risks.
- Low Thermal Conductivity: Uniform porous structure minimizes furnace wall heat losses.
- Excellent Thermal Shock Resistance: Resists thermal cycling and repeated furnace starts/stops without spalling.
- Precision Custom Machining: Available with wire routing holes, spiral grooves, and stepped slots per drawing.
- High Chemical Inertness: Chemically stable in both oxidizing and neutral furnace atmospheres.
Specification Parameters
| Index | JM26 | JM28 | JM30 |
|---|---|---|---|
| Classification Temp (℃) | 1450 | 1550 | 1600 |
| Bulk Density (g/cm³) | 0.80 | 0.90 | 1.05 |
| Cold Crushing Strength (MPa) | ≥ 2.0 | ≥ 3.0 | ≥ 3.8 |
| Al₂O₃ (%) | ≥ 56 | ≥ 68 | ≥ 73 |
| Fe₂O₃ (%) | ≤ 0.8 | ≤ 0.6 | ≤ 0.5 |
| Thermal Conductivity @ 600℃ (W/m·K) | 0.29 | 0.34 | 0.42 |
