FHL-VAC® Modules & Panels

FHL-VAC® Embedded Flat Heating & Insulation Panels

Heating element embedded inside the insulating module — a complete heated wall in one panel.

FHL-VAC® Embedded panels are a special type of ceramic fiber panel where the heating element is embedded inside the insulating module. The element radiates thermal energy into the required chamber through a formed window, while the ceramic panel resists energy loss to the atmosphere.

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FHL-VAC® embedded flat insulation panel with integrated heating element

Up to 1050°C

Key features

Heating element fully embedded and protected within the module

Radiant window directs heat into the chamber — insulation blocks losses

Integrated design reduces installation time and refractory mass

Elements in Fe-Cr-Al or Ni-Cr 80 alloys

Uniform heat flux for precise, repeatable processes

Custom-built board dimensions and wattage on request

The result is a compact, integrated heating-plus-insulation unit: fewer components, cleaner furnace interiors, excellent temperature uniformity and significantly lower energy consumption than conventional brick-and-element constructions. We manufacture this product in various sizes and grades to meet customer needs.

Custom-Built Parameters

Thickness: 90 / 100 / 125 mm
Board size (L × W): 950 × 950 mm per board
Customization: We also work for your exacting requirements

Typical Applications

Chamber FurnacesContinuous FurnacesHeat Treatment FurnacesBaking & Drying Ovens

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