Lukorma
Furnace Lining Material
Lukorma — DFP India's specialist alumina-spinel neutral ramming mass for high-temperature special-alloy and alloy-steel melting. India's first.
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German refractory technology · Made for India
Refractory linings that outlast the toughest melts.
DFP India brings Dörentrup's neutral lining and liquid-sintering technology — pioneered in Germany in 1901 — to Indian foundries and mini steel plants.
1901
Dörentrup founded, Germany
13+ yrs
DFP active in India
ISO 9001:2015
Certified, in-house QC lab
World's 1st
Alumina Spinel NRM in India
Why neutral lining
The smarter choice for modern steelmaking.
01
Chemically neutral
Unlike silica, neutral ramming mass does not react with acidic or basic slags — so it handles contaminated scrap and up to 90% DRI in the charge mix without rapid erosion.
02
Longer campaigns, fewer repairs
Lukorma delivers 160–250 hours of campaign life depending on furnace grade, and cuts patch repairs by up to 60% versus conventional silica linings.
03
Lower cost, not lower spec
Fewer relines, less downtime, and a lower total refractory spend per tonne of metal across the campaign.
Get a cost comparison→Product range
Six refractory systems for the induction furnace.
DF 4 G T / DF 4 G Q T
Fused & Natural Silica
German/Swedish-sourced silica ramming mass, premixed with 200-mesh boron oxide.
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Doriflow
Ladle Lining Material
Low-cement, ultra-low-cement and no-cement castables for inclusion-free castings.
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Doricast
Coil Grout Material
The safest material in the induction coil.
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Insulation Sheet / Dorupak 90
Insulation Material
High-temperature insulation that cuts ladle body temperature by ~60°C.
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Lining Vibrators & Tools
Lining Tools
German-engineered lining vibrators that compact ramming mass without damaging the coil.
View details→Frequently asked questions
What is ramming mass used for in induction furnaces?
Ramming mass is a monolithic refractory rammed into the furnace crucible to protect it from molten metal. Neutral types like alumina-spinel resist slag attack, while silica types are the standard for acidic-slag iron foundries.
How do you know the quality of a neutral ramming mass?
Judge a neutral ramming mass by its chemical composition (high alumina and near-zero silica for true neutrality), consistent grain sizing batch-to-batch, and verified campaign-life data — not price alone. DFP India's Lukorma is ISO 9001:2015 certified and validated batch-by-batch in an in-house QC lab, so the spec sheet matches what actually reaches your furnace.
Is German refractory technology better for induction furnaces?
German-engineered refractories are known for tighter grain consistency and chemistry control. DFP India brings this directly as the official channel partner of Dörentrup Feuerfestprodukte, founded in 1901.
What refractory is needed for high-DRI charge mixes?
Furnaces running up to 90% DRI need a chemically neutral lining like alumina-spinel ramming mass, since acidic silica linings degrade faster with sponge-iron-heavy charges.
How do I choose between silica and neutral ramming mass?
Silica suits acidic-slag cast iron and SGI foundries; neutral (alumina-spinel) suits induction furnaces prone to corundum buildup or variable/contaminated scrap.
Who is DFP India?
DFP India is the official channel partner of Dörentrup Feuerfestprodukte, a German refractory manufacturer founded in 1901, supplying furnace linings, ladle castables, coil grout, insulation, and lining tools to Indian foundries and steel plants.
Talk to an application engineer.
Share your application area, metal grade, current lining life and your operational process, and we will recommend the best DFP India refractory solution for you — and help you improve your productivity.