Foundry Additives

GEKO™ and ECOSIL™: Natural molding sand additives in precision castings


Sustainability and Re-Cultivation are really important to us.


Unrivaled precision, smooth processability and easy shake-out for iron and steel castings: GEKO™ is the effective booster for foundry productivity and perfect castings. ECOSIL™ lustrous carbon former adds the finishing touch, ensuring easy mold separation, improved surfaces and increased mold stability.

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Our unique eco-friendly technologies, ECOSIL™ LE and GEKO™ LE, drastically reduce emissions and help foundries comply with highly demanding environmental regulations and standards. This is our two-tiered Bentonite solution to provide a one-of-a-kind efficient molding system.


    • Mechanical engineering
    • Electrical engineering
    • Construction industry
    • Rail vehicle construction
    • Steel industry
    Green sand molding process with LE technology GEKO LE and ECOSIL LE

    Combine high stability during foundry process with easy disintegration afterwards

    To enable production of high-quality cast components and allow high-throughput rates.


    Minimize toxic byproducts emitted during foundry process

    To protect the health of the foundry workers as well as the environment.


    Create high-precision casts

    To minimize waste of material, time and money.


    Natural clay mineral-based foundry bentonite GEKO is made out of highest quality bentonite

    It allows for highest mold stability during the foundry process, shorter mixing times and quick disintegration at knockout.


    Blend of high quality foundry bentonite and lustrous carbon former

    ECOSIL™ increases the stability of the mold, improves casted product quality by helping to create smooth surfaces, and speeds up mold disintegration after casting. On top of that, it minimizes emission of toxic compounds. 


    Good fluidity and high elasticity of sand mold

    The chemically activated foundry bentonite GEKO™ deposits water molecules between the clay mineral layers, which have been expanded by the activation. It swells rapidly and thus has a good binding capacity to hold the casting mold’s grains of sand.


    HighRes_CLA MOBILITY CP_Foundry_6_Activation_raw_clays_theory

    Easy separation of cast and mold

    The lustrous carbon former component of ECOSIL™ creates a very thin shiny carbon layer around the silica grains of the mold sand, facilitating the separation of the cast from it.

    HighRes_CLA MOBILITY CP_Foundry_7_Function_clay_minerals_sand_casting_molds

    Clariant makes an important contribution to a quicker, more environmentally-friendly green sand casting process:



    Shorter mixing time = high throughput 



    Low emmission technology



    Smooth cast surfaces = high precision




    Faster mold disintegration




    Easy reuse of sand due to low contamination


  • EcoTain®

    Sustainable green sand additives

    Having the highest productivity and being a good neighbour has never been this easy for foundries. Clariant’s two-tiered solution for a drastic reduction of BTEX emissions from green sand while maintaining high throughput, clean casting surfaces and low scrap rates.


  • Low Emission Technology

    Our unique eco-friendly technologies, ECOSIL™ LE and GEKO™ LE, drastically reduce emissions and help foundries comply with highly demanding environmental regulations and standards. This is our two-tiered Bentonite solution to provide a one-of-a-kind efficient molding system.


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