Tap hole cone

Vacuum-formed refractory shapes / tap hole cones

We serve several parts used in the casting process of aluminum rods and aluminum alloys.

1300 °C Classification Temp.
Manufacture according to customer specifications

  • Tap hole cone

    • Tap hole cones act as a plug to regulate the flow of molten metal from furnaces and ladles, in the casting process of aluminum rods and aluminum alloys.
    • They have proper hardness and toughness, not fragile or peel off.
    • Cup caps are produced in large quantities by the vacuum suction filter molding process, mixed with specially selected inorganic and organic binders.


    • Excellent insulating properties
    • High feed efficiency
    • High strength/weight ratio
    • Good thermal shock resistance
    • Low thermal conductivity and thermal mass
    • Low heat
    • Low smoke
    • Non-stick aluminum
    • Formulations range from hard molds to very flexible molds with good recovery properties and can be based on ceramic fibers, biosoluble fibers, or mineral fibers. This process is mainly used for round or conical molds.
    • They are produced in different densities, specifications, patterns, and performance to meet the most demanding thermal requirements of our customers.
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    Great Selection of products

    Great portfolio of vacuum shaped refractory parts

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    Various designs and qualities available.

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    Experienced consulting

    Thanks to our years of experience we can advice you for best quality products

    An opening at the bottom of the cupola at the cupola heart through which the molten iron can flow out of the furnace via a channel. The tap hole is plugged with a plug after each charge during periodic melting and is pierced again during the next tapping.


    It has the advantages of lightweight, high-temperature resistance, good thermal stability, low thermal conductivity, small specific heat, and mechanical vibration resistance.

    Technical support

    • Tap hole cones are suitable for mechanical or manual operations.
    • We are ready to support you and propose the best solutions to your problems.

    Customized solutions

    • Custom shapes in various hardness grades are available on request.
  • Downloads

    Hoffmann product catalog

    Refractory | Seals | Foundry supplies | Conveyor chains | Chesterton


  • K. Hoffmann GmbH

    K. Hoffmann GmbH

    Since 1986, K. Hoffmann GmbH has been at home as a production company in the high-temperature sector. Specializing in vermiculite as the main material, we offer board products and shaped parts as mass-produced and cost-oriented quality goods, as well as complex custom-made products for industrial and home use for thermal insulation and fire protection technology!

    As part of the SENN Group, we have access to a broad network of specialized companies and their associated experience and products, enabling us to meet every requirement!


ATTENTION - Sale to professionals only

K. Hoffmann GmbH

Your specialist for vermiculite, refractory and high-temperature resistant insulation solutions.

© K. Hoffmann GmbH

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