• asbestos plug
  • asbestos plug

Asbestos Plug

The Asbestos Plug is a perfect solution for aluminum smelting furnaces, refining furnaces, holding furnaces, and other high-temperature equipment. It is designed to provide excellent thermal insulation and sealing performance up to 1400°C.

  • Excellent abrasion resistance and non-wet ability to aluminum
  • Lightweight, easy to handle and install
  • Shock-resistant, reliable, and safe production


Asbestos Plug, also known as tap out cone, is a high-temperature insulation and sealing product used in the aluminum foundry industry. Made from alumina-silicate ceramic fiber, this product is designed to withstand the extreme conditions of aluminum melting and refining furnaces, providing a reliable, safe, and convenient sealing solution.

It is most commonly used in the aluminum industry for the insulation and sealing of tapholes, launder systems, and in the production of aluminum and aluminum alloys.

tap out cone
Grade Standard High Aluminium Zirconium
Working Temperature (℃) 1150 1260 1450
Shrinkage on Heating (%) 800℃×24h≤﹣3 1000℃×24h≤﹣3 1280℃×24h≤﹣3
Thermal Conductivity (w/m.k) (250kg/m3) 200℃ 0.055-0.065 0.060-0.070
400℃ 0.110-0.120 0.105-0.125
600℃ 0.170-0.180 0.170-0.180
Bulk Density (kg/m3) 300~450
Size According to the customer’s requirements and drawings

Remarks: The above data is for reference only, the maximum temperature depends on the working environment.

Shapes and Sizes

SEFU Asbestos Plug comes in a variety of shapes and sizes, including tube, cone, cylindrical and square, to comply with the specific requirements of aluminum smelting factories. To meet customers’ unique needs, we can also produce custom-made products with molds according to specific dimensions and shapes.

manufacturing of tap out cone
asbestos plugs


Asbestos Plug possesses excellent wear and peel resistance, which ensures that it remains unaffected by aluminum water or liquid and maintains its high insulation, lightweight, and impact resistance properties.

Its unique shape and size are designed to meet the specific production requirements of aluminum smelters, with each plug manufactured using custom-made molds to meet the desired performance specifications of the product.


Asbestos Plug is an excellent insulating material due to its high-temperature resistance and thermal insulation properties. It is a lightweight and low-density product that can withstand temperatures of up to 1400℃ for long periods without cracking or breaking.

As a sealing material, Asbestos Plug effectively seals the outlet of molten aluminum and aluminum alloy refining furnaces.

The product’s excellent wear resistance and peel strength properties ensure that it can withstand wear and corrosion, and remain unaltered by the molten metal, ensuring a safe and reliable production process.

package of ceramic fiber products

More Customization for Your Aluminum and Aluminum Alloy Production

SEFU CERAMIC team is committed to providing the best possible service and expertise to meet your needs. Order your Asbestos Plug product today, and experience high-quality sealing and insulation that is both reliable and cost-effective!

Let us customize it for you now!


Looking for a safe and effective solution for your insulation needs? SEFU ceramic fiber products are expertly designed and rigorously tested to ensure maximum durability and performance, making them the perfect choice for aluminum process projects. So why wait? Contact us today and experience the power of our top-of-the-line Asbestos Plugs for yourself! We’re confident that you won’t be disappointed.

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