Refractory Sand and Flours

Refractory Materials for Ceramic Slurry


Remet supply refractory flours and sands compatible for all alloys cast by the investment casting industry. With grades to make up primary (face coat) and secondary (backup) slurries of the ceramic shell.

There are a number of key considerations, when selecting a refractory for use.

  • Thermal resistance
  • Thermal expansion
  • Thermal conductivity
  • Stability in slurry/reactivity with binder
  • Particle size
  • Mixing time

Remet’s comprehensive range of refractories, enables us to create a solution to ensure both a high quality ceramic shell and final casting is produced.

See our FAQ’s about shell testing here.

  • QUIKBUILD Refractories

    QuikBuild refractories are special flour blends that are designed to enhance the performance of Remasol® QuikBuild

    The wide particle size distribution of the QuikBuild refractories maximises the benefits of a QuikBuild slurry
    creating thicker shell layers.

    It is available in two types:

    • QuikBuild F – Fused Silica
    • QuikBuild A – Aluminosilicate

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    Aluminosilicate Refractory Flour & Sand


    REMASIL® is the trade name for REMET® UK’s Aluminosilicate products. Composed of three systems (REMASIL 48, 50 & 60), all calcined to a constant weight and ground to specific grade of both grains and flours. These products produce investment casting shells of excellent refractoriness and high temperature stability, at an incredibly economical rate. The REMASIL® range provides increased strength when compared to Fused Silica systems.

    In the case of stucco grains, the custom grinding of REMASIL results in a more uniform product which has a narrow range of particle sizes and a minimum amount of fines (dust). Reduced fines improve both permeability and intercoat adhesion.  Whilst the powder grains can offer the user a greater level of flexibility, through its offering in two separate cuts, allowing a foundryman to choose the specific grade that best suits their needs.

    REMASIL 48 Benefits

    • Good refractoriness and high temperature stability.
    • Easy knockout.


    REMASIL50 Benefits

    • Increased hot strength.
    • Robust and resilient.
    • Easy knockout.


    REMASIL 60 Benefits

    • Higher Alumina content provides for increased refractoriness and stability at high temperatures.
    • Excellent for casting larger parts.
    • Performs exceptionally well when dimensional stability is crucial.

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  • REMET® Fused Silica Refractory Flour & Sand

    REMET® UK Fused Silica is made from pure, natural white silica rich sand at 1980oC. At this temperature, the crystalline quartz melts and becomes non-crystalline. The resulting refractory is a pure material that is readily available, which provides a long life slurry practical for both ferrous and non-ferrous metal casting.

    REMET UK Fused Silica has excellent thermal characteristics, as it exhibits a very low level of thermal expansion (5.0 x 10-7 cm/cmoC). Whilst it also provides low thermal conductivity, together these attributes provide a refractory with excellent thermal shock resistance.

    This product provides for excellent slurry stability as well as good pH stability, when used in the primary coating. This will aid in preventing the solution from dropping out, which is crucial in achieving an even coat application, essential in avoiding surface defects.

    The shell produced using REMET UK Fused Silica, is both light weight and highly permeable. Whilst the refractories unique behaviour under extreme heat, creates a shell that once cooled, allows for an easier knockout.

    This material is offered in a wide variety of powder and grain sizes, including our Ez-Cast shell system, for both primary and secondary coat slurry applications.

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  • REMET® Zircon

    REMET® UK Zircon Sand and Flour are milled from raw materials from a resource with a long manufacturing life. The zircon is dried, milled, screened and subject to magnetic separation. Products have excellent chemical and physical consistency zircon is available in both fully calcined and part calcined forms.

    The thermal response of zircon is its major attraction to the investment caster. Not only does it have a low thermal expansion coefficient, but it also has a very predictable and linear response making dimensional prediction of finished parts much simpler and more reproducible.

    Other characteristics of zircon in general to be added;

    • Very low reactivity (good for prime coats)
    • High solids loading capability
    • High strength
    • Fine particle size for good surface quality
    • Excellent rheology

    These products are broadly used by foundries producing aerospace castings-equiax, directional solidification and single crystal; and by commercial and art foundries which require premium surface quality.

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  • REMET® Alumina

    Fused & Tabular Alumina Refractory

    REMET’S®  Alumina products are high purity Al2O3 compounds, that provide a hard refractory material for use by the investment caster.

    White Fused Alumina
    Remet’s White Fused Alumina (also known as White Corundum) is a high purity product fused and sized to meet the needs of the investment caster.

    This product exhibits:

    • High Refractoriness
    • High Resistance to Chemical Attack


    Tabular Alumina
    Remet’s Tabular Aluminas are specifically sized, high density, low soda tabular alumina products.

    They exhibit:

    • Low Porosity
    • High Resistance to Chemical Attack
    • Excellent Resistance to Thermal Shock
    • High Mechanical Strength
    • Extreme Hardness
    • Excellent Resistance to Wear

    This product is ideal for high-temperature shell systems.


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  • Zirconium Oxide

    REMET® UK Stabilized Zirconia are electrically fused combinations of Zirconium Oxide and approximately 4% Calcium Oxide. This yields products with about 70% Cubic Zirconia plus 30% Monoclinic Zirconia.

    The major investment casting application for this family of products is as the primary coat flour and stucco in the casting of reactive alloys including Titanium alloys.

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  • Cobalt Aluminate

    Cobalt aluminate is used as part of a primary slurry to improve the surface grain of investment casting’s, particularly for superalloys.

    A cobalt aluminate composition that has been prepared at temperatures above 1350°C to ensure thermal stability. It has a theoretical composition of 41.5% cobalt oxide and 58.5% alumina. After calcinations, the material is wet ground and sieved to produce a fine powder easily dispersible in aqueous suspensions.


    • Produces alloys with a fine-grained structure
    • Grain refinement penetrates into the body of the casting
    • Finely disseminated network of nucleation centers
    • Minimal risk of migration by low melting point metals
    • Fully calcined and thermally stable
    • Easily dispersed in aqueous suspensions
    • Produced to aerospace specifications
    • Used by many OEM’s

    Approved in accordance with PMC-7022 (Pratt and Whitney) and CSS25 (Rolls Royce).

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