FAQ
Frequently asked questions
Straight answers on our modules, elements, coatings, grades and how to work with us.
Vacuum-formed ceramic fiber modules are rigid insulation shapes made by drawing a slurry of ceramic fiber and binders onto a forming mould under vacuum. The process produces dense, dimensionally precise panels, segments and cylinders with low thermal conductivity and very low heat storage. FeroHeat's FHL Modular Heating System uses FHL-VAC® modules as hot-face furnace linings — plain, or with embedded / surface-mounted heating elements.
The FHL Modular Heating System is FeroHeat's range of vacuum-formed ceramic fiber modules and matching heating elements — factory-formed panels, segments and cylinders that install as a complete hot-face lining, plain or with embedded / surface-mounted heaters, and are manufactured from asbestos-free ceramic fiber for service up to 1550°C.
Three standard grades: FHL-M 1150 (classification 1260°C, max continuous 1150°C), FHL-Z 1325 (1425°C / 1325°C, zirconia-bearing) and FHL-HT 1550 (1650°C / 1550°C, high-alumina). For heating elements, Fe-Cr-Al alloys cover element duty up to 1420°C and Ni-Cr 80 up to 1100°C. Our R&D work on elements and insulator combinations spans 20–2000°C.
Yes — custom-built modules are our normal way of working. Standard flat boards are 950 × 950 mm in 50 / 75 / 90 / 100 / 125 mm thicknesses, and cylindrical segments start from ID 100 mm in 25 / 50 / 75 / 90 / 100 / 125 mm thicknesses, but we regularly manufacture to customer drawings: special shapes, grooves, wattages and hardware provisions.
In embedded panels, the heating element is buried inside the ceramic fiber module and radiates through a formed window — the element is protected and the construction is very compact. In free-radiating FHL-VAC® panels, the heater is suspended on hooks at the module surface and radiates freely into the chamber, allowing higher power density, faster response and very easy replacement.
As a rule: Fe-Cr-Al (our Alloy 1 & 2) for element temperatures from ~1100°C up to 1420°C — higher maximum duty temperature and lower oxidation rate at high temperature. Ni-Cr 80 below ~1100°C where its better ductility, higher elongation and non-magnetic behaviour are advantageous. Our engineers will confirm the right alloy, wire diameter and surface load for your furnace atmosphere and cycle.
FHL-MULTICORE® is our special multi-core heating element construction. Compared with a single-core element of the same overall size, it consumes more power and reaches higher temperatures in quicker time for a given space — the compact way to increase furnace output without enlarging the chamber.
Yes. Beyond manufacturing, we provide furnace design & concept development, complete relining, retrofitting of existing furnaces to low-mass FHL-VAC® systems, energy audits, CFD heat-distribution simulation and on-site installation & commissioning support.
FHL® Emiglaze is a high-emissivity thermal coating for high-temperature furnaces. Applied over refractory or ceramic fiber surfaces it increases wall emissivity — re-radiating more heat to the workload — and seals fiber surfaces against erosion and dusting. Use it as a fast energy-saving retrofit or as the finishing coat over new FHL-VAC® linings.
Send us your furnace type, chamber dimensions, operating temperature, atmosphere and cycle details — drawings or photos help. Contact Mr. Pranesh Kumar (+91 93413 52747) or Mr. Nagabhushana Sastry (+91 98453 22667), email info@feroheat.com or feroheat@gmail.com, or use the enquiry form / WhatsApp on this website. Our engineers respond with a technical proposal and quotation.
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