Brown Fused Alumina is a tough, sharp abrasives which is highly suitable for grinding metals of high tensile strength. Its thermal properties make it an excellent material for use in the manufacture of refractory products. This material is also used in other applications like blasting and surface hardening.

Brown Fused Alumina is produced by the smelting of Calcined Bauxite in an electric arc furnace at temperatures greater than 2000°C. A slow solidification process follows the fusion, to yield blocky crystals.   Strict control over Titania levels during the fusion process ensures optimum toughness of the grains.

The cooled crude is further crushed, cleaned of magnetic impurities in high intensity magnetic separators and classified into narrow size fractions to suit the end use.  Dedicated lines produce products for different applications.

White Fused Alumina is a high purity, synthetic mineral, manufactured by the fusion of controlled quality pure grade Bayer Alumina in an electric arc furnace at temperatures greater than 2000˚C followed by a slow solidification process.  Strict control over quality of raw materials and fusion parameters ensure products of high purity and high whiteness.

The cooled crude is further crushed, cleaned of magnetic impurities in high intensity magnetic separators and classified into narrow size fractions to suit the end use.  Dedicated lines produce products for different applications.

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White Fused Alumina is highly friable and hence used in Vitrified Bonded Abrasives products where cool, fast cutting action is essential and also in the manufacture of high purity Alumina refractories. Other applications include use in Coated Abrasives, Surface treatment, Ceramic Tiles, Anti-Skid Paints, Fluidized Bed Furnaces and Skin / Dental Care.

Silicon Carbide is a man made mineral of extreme hardness and sharpness. It is the ideal abrasive for grinding / sanding materials of low tensile strength such as Cast Iron, Brass, Aluminum, Bronze etc. Its thermal properties make it an excellent medium for use in the manufacture of refractory products and crucibles.

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Silicon Carbide is produced by a process involving the electrochemical reaction of silica – in the form of quartz with Carbon in the form of raw petroleum coke. The stoichiometric mixture is reacted in an electrical resistance furnace at a temperature greater than 2200˚C to yield high quality crystals. The large crystals are then segregated, crushed, cleaned of magnetic impurities in high intensity magnetic separators and classified into narrow size fractions to suit the end use. Dedicated lines produce products for different applications.

Silicon Carbide Grains are also used in marble and granite polishing, manufacture of Kiln furniture and as a deoxidizer in Iron and steel making.

Semi-Friable Alumina is a low titania containing brown corundum produced by controlled smelting of special grade Bauxite in an electric arc furnace above 2000 deg C. The lower titania gives an intermediate toughness between that of White and Brown Regular corundum and strict control of this parameter over a narrow band ensures consistent quality.

The cooled crude is further crushed, cleaned of magnetic impurities in high intensity magnetic separators and classified into narrow size fractions. The grains are further annealed at intermediate temperatures in a specially designed kiln to build predictable toughness characteristics.

In Bonded Abrasives, semi friable alumina can be used in depressed center wheels, cut off Wheels, in Surface and Cylindrical Grinding of heat sensitive metals, alloys etc. The wheels made of this material are made best use of where cool and fast cutting is required.

In Coated Abrasives, these grains are best suited for use in metal finishing and for sanding of wood, plastic coatings and paint.

Blue Fired Semi Friable Alumina is a low titania containing brown corundum produced by controlled smelting of special grade Bauxite in an electric arc furnace at greater than 2000 deg C. The lower titania and an intermediate toughness between that of White and Brown Regular corundum and strict control of this parameter over a narrow band ensure consistent quality.

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The cooled crude is further crushed, cleanses of magnetic impurities in high intensity magnetic separators and classified into narrow size fractions. The grains are further annealed at a high temperature in a specially designed kiln to build predictable toughness characterization.

These grains are best suited for use under extreme grinding conditions where high stock removal efficiency is required. Main uses are in metals especially alloyed steels, non Ferrous metals and alloys of Copper and Zinc.

Fused Mullite is manufactured by fusing a mixture of high purity Bayer Alumina and pure Quartz in a tilting type arc furnace at a temperature around 2000 deg C.  Controlled cooling of the molten mass ensures a high degree of mullitization characterized by well defined columnar crystals.

The cooled crude is further crushed, cleaned of magnetic impurities in high intensity magnetic separators and classified into desired size fractions.

Fused Mullite is one of the main raw materials used by the refractory industry for applications requiring thermal shock resistance and corrosion resistance.

CUMI manufactures Fused Calcia Stabilzed Zirconia material for use in the manufacture of slide gate refractories used in the continuous casting of steel.

A mixture of high quality zirconia and lime is fused at a temperature greater than 2400oC to create a partially stabilized zirconia product. The cooled mass is crushed, cleaned of magnetic impurities in high intensity magnetic separators and screened to desired size fractions. The grains are thermally treated to ensure uniformity of stabilization.

AzureS is a Sintered Alumina abrasives grain. It is manufactured by our patented state-of-the-art process through sol-gel technology. This grade of sintered alumina abrasive grain is well known for its high performance and unique fracture characteristic. It performs better in high pressure grinding application and also withstands other severe application conditions. It also provides cooler cutting and longer life of the wheel. All these make this grain a unique choice for the abrasives manufacturers.

CUMI’s Fused Zircon Mullite (ZirMul) is manufactured by fusing a mixture of high purity raw material by a unique process. The fused solidified ZirMul is crushed and graded to custom sizes in a state of the art facility.

CUMI HEAT ZirMul is used in applications requiring high resistance to environmental corrosion and a low coefficient of thermal expansion like refractory shapes requiring resistance to molten slag and molten glass, ceramic pressure casting tubes etc

Nebulox ultra light porous insulation refractories offers very low thermal conductivity for high temperature applications up to 1700ºC. Produced from pure raw materials through a patented technology, Nebulox products are free from fibre and hence safe for health and environment. The unique porous structure offers excellent thermal shock resistance over a wide temperature range and can be easily machined to suit the specific applications. The Nebulox is available with two chemical compositions, in standard sizes upto size of 450x300x64mm. Special sizes/chemistry can be offered on request.

It is also available in the form of pellets as an aggregate for high temperature insulating bricks and castables.

CUMI produces Pure Alumina, Alumina – Titania Composite, Pure Titania and Partially Stabilized Zirconia Powders for thermal spray and plasma spray applications.

These powders are manufactured by fusion of pure raw materials. The fused products are ground and classified to yield narrow particle size distributions.  The powders are designed for use with standard Plasma Spray and HVOF equipment.

The closely controlled Chemical Composition and particle size distribution are instrumental in producing uniform high quality ceramic coatings. The dense and rounded particles ensure free flow of the powders.

Silicon Carbide Micro Grits are produced by milling of selected and cleaned macro grain feedstock.

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The milling and classification is done in CUMI’s state of the art milling and classifying facilities which yields powders of tight distribution, consistent shape, high purity and low dust levels. A safety screening of the powders is carried out to further ensure that the grains are free of coarse particles.

An in-line particle size analyzer coupled to a fully automated control system delivers a high level of repeatability of the process and yields a very predictable product. Particle size counters are used for testing and reporting size distributions and a shape analyzer helps in fine tuning the process to obtain shape specific products for various applications.

Major applications include

Bonded abrasives
Coated abrasives
Super Finishing stones
Lapping
Silicon wafer slicing
Brake Liners
Diesel particulate filters