FHL-VAC® Modules & Panels
FHL-VAC® Free Radiating Flat Insulation Panel With ROB & SOB Heaters
FHL-VAC® free-radiating panels with surface-suspended FHL-MULTICORE® ROB & SOB heaters for maximum power density.
The free-radiating design of FHL-VAC® Flat Insulation Panels enables ROB and SOB heaters to radiate heat across the full heater surface, supporting high power density and exceptionally fast thermal response. Ideal for applications requiring rapid heat-up and reduced cycle times, the panels are available in a wide range of sizes, shapes, and material grades to suit diverse industrial heating requirements.
1150 – 1550°CKey features
Free-radiating element — maximum heat transfer to the workload
Accepts FHL® single-core ROB, FHL-MULTICORE® ROB and SOB heaters
Element hooks embedded in the module — quick element replacement
Low-mass insulation cuts stored-heat losses
Thickness options up to 150 mm for higher insulation duty
Grades up to 1550°C; custom shapes and ratings
Custom-Built Parameters
- Thickness
- 90 / 100 / 125 / 150 mm
- Board size (L × W)
- 950 × 950 mm per board
- Heater types
- FHL® Single-Core ROB · FHL-MULTICORE® ROB · FHL® SOB
Typical Applications
Technical data
Published grade data for FHL-VAC® insulation and FHL® heaters. Values are typical for the grade; confirm design values with our engineers for your duty cycle.
Technical Data — FHL-VAC® Modules & Panels
| Parameter | FHL-M 1150 | FHL-Z 1325 | FHL-HT 1550 |
|---|---|---|---|
| Classification Temperature (°C) | 1260 | 1425 | 1650 |
| Max. Continuous Working Temp. (°C) | 1150 | 1325 | 1550 |
| Density Range (kg/m³) | 200 – 240 | 200 – 240 | 200 – 240 |
| Linear Shrinkage % (24 h at Continuous Working Temp.) | < 1 | < 1 | < 1 |
Thermal Conductivity (W/mK)
| Mean Temperature | FHL-M 1150 | FHL-Z 1325 | FHL-HT 1550 |
|---|---|---|---|
| At 200°C | 0.065 | 0.065 | 0.065 |
| At 600°C | 0.13 | 0.13 | 0.14 |
| At 1000°C | 0.27 | 0.28 | 0.24 |
| At 1200°C | 0.40 | 0.38 | 0.33 |
| At 1300°C | 0.48 | 0.47 | 0.39 |
| At 1400°C | — | 0.53 | 0.45 |
| At 1500°C | — | — | 0.51 |
Chemical Composition (%)
| Component | FHL-M 1150 | FHL-Z 1325 | FHL-HT 1550 |
|---|---|---|---|
| Al₂O₃ | 47 | 37.5 | 66 |
| SiO₂ | 53 | 49.5 | 33 |
| Zr | — | 13 | — |
Physical & Mechanical Properties of FHL-MULTICORE® Heating Elements
Other elements present in small quantity. Values are typical for the grade; confirm design values with our engineers for your duty cycle.
| Fe-Cr-Al Heating Element | Ni-Cr 80 Heating Element | ||
|---|---|---|---|
| Property | Alloy 1 | Alloy 2 | Ni-Cr 80 |
| Standard Chemical Composition (%) | Al 5.0 · Cr 23 · Fe 72 | Al 6.0 · Cr 23 · Fe 71 | Cr 19–21 · Fe < 1 · Ni ≥ 77 |
| Max. Duty Temp. of Heating Element (°C) | 1320 | 1420 | 1150 |
| Electric Resistivity (Ω·mm²/m) | 1.35 ± 5% | 1.45 ± 5% | 1.08 ± 5% |
| Density (g/cm³) | 7.25 | 7.1 | 8.3 |
| Expansion from Thermal Factor (K⁻¹) | 15.1 × 10⁻⁶ | 14.8 × 10⁻⁶ | 17.6 × 10⁻⁶ |
| Thermal Conductivity at 20°C (W/m·K) | 13 | 13 | 13 |
| Specific Heat Capacity at 20°C (kJ/kg·K) | 0.46 | 0.46 | 0.46 |
| Melting Point (°C) | 1500 | 1500 | 1400 |
| Hardness Hv | 200 – 240 | 200 – 240 | 180 – 200 |
| Electric Resistance Temp. Coefficient | 33 × 10⁻⁶ | 15 × 10⁻⁶ | 58 × 10⁻⁶ |
| Increase from Oxidation 1200°C (mg/cm²·h) | 0.05 | 0.05 | 0.25 or less |
| Tensile Strength MPa (kgf/mm²) | 650 – 900 (65 – 90) | 650 – 900 (65 – 90) | 700 – 900 (70 – 90) |
| Magnetic Properties | Magnetic (Curie point 600°C) | Magnetic (Curie point 600°C) | Non-Magnetic |
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