Continental Trade Sp. z o. o.

News

Mica slip plane for ferrous and non-ferrous foundries

An effective application for coreless induction coil furnaces

Mica-based linings are flexible, easy to handle, and have replaced asbestos in most countries of the world hence contributing non-hazardous products to maintain the health of foundry personnel.

Non-toxic mica rolls are delivered 1 m wide and 25 m long and serve as:

  • Slip-Plane: Glass fiber reinforced mica with high tensile strength,
  • Safety-Layer: protecting the coil against refractory material movements
  • Separating-Layer: gas diffusion barrier
  • Isolation-Layer: electrical and thermal protection
  • Protection Layer: compensates bath movements (mainly vertical)

Main products:

  • Mica Foil Combi G (Mica/High-temperature CaSi-paper).
  • Mica Foil PGM (Phlogopite/Muscovite mica, glassfiber-reinforced) 

Sensitive, water-cooled copper coils in induction furnaces are protected by a concrete wall (coil grout) against refractory (thermal insulation). Removal of the worn refractory material with a hammer drill is expensive and may cause damage. A tear resistant, mica-based, layer enables separation of residual (sintered) refractory from the concrete wall when pushed out and in such protects the coil, elongates service life of the refractory in the crucible and reduces maintenance costs.

When lining coreless induction coil furnaces, SiO2 - based refractory material is inserted locally into the crucible and compacted to form the thermal insulation of the coil from smelt. The approximately 10 cm thick insulation degenerates, depending on the nature/aggressiveness of the smelt, after some 200 applications, 2-6 weeks with melting (usually medium frequency) furnaces.

Removal of the old, used, mass and slag and following relining of a crucible furnace with heat insulation demands caution and experience. Getting the coil grout surfaces sufficiently smooth, so that no defects in the coil wall arise, is labor- and time consuming.

Mica foils provides an asbestos-free and biodegradable mica-based layer to serve as slip-plane of used refractory during demolition. The slip-plane material consists of glass fiber reinforced mica paper (ca. 0.3 mm to 0.5 mm thick) laminated with heatresistant silicon binder. It may be combined with 2 mm Calcium-Silicate-paper when required at larger furnaces, where the wall (coil grout) is rather uneven.

This, generally 1 m wide and odorless, "wallpaper" is delivered on a 25 m long roll that is cut to required size and mounted vertically on the furnace wall (Fig. 1). It is fixed at the top with glue (water- and halogen free) or tape. Mica side shows to the interior of the furnace (Fig. 2). The mica coating ensures good sliding between the refractory material and the coil grout.

 

Figure 1    Figure 2
Figure 1: The mica "wallpaper" are 
delivered on 25 m long rolls, 1 m wide.
  Figure 2: The 100 cm wide strips, cut and mounted perpendicular to serve as a sliding layer.

 

Slip-plane Mica Foil Combi G is a flexible, cold formed laminate comprised of phlogopite and calcium silicate fiber with a special silicon binder. The approximately 2.3 to 2.5 mm thick fiber for the isolation of induction furnaces tolerate temperatures up to 1 050°C, compensates surface unevenness of the concrete wall which is only 2 cm thin and thus reduces cavities.

Mica Foil PGM, is about 0.3 mm to 0.5 mm thick, glass-fiber reinforced and comprised of phlogopite and muscovite layers glass reinforced in between. It is preferably used for smooth interior walls of the furnace to be found usually in smaller furnaces (<2ton).

Both Mica-based slip-planes further compensate refractory movements caused by the permanently active smelt.

Effective and at the same time harmless to health and ecologically safe. The asbestos-free insulation fibers and insulation foils for induction furnaces are based on muscovite or phlogopite  mica. Mica is a layered silicate with a high electrical resistance. It is heat resistant and in addition resistant to almost all media, such as alkalis, gases, oils and acids.

According to Hazardous Substances 91/155/EEC Regulation, mica has no health risks, both in storage and during installation and removal. Thus, no special measures have to be taken with respect to the removal of the insulation fibers and insulation films in induction furnaces. The material decomposes in nature into its individual components and can be safely disposed as construction debris and municipal waste landfills. 

Continental Trade Sp. z o.o. supplies mica products worldwide since 1995 and occasionally expands it’s product portfolio with adjacent insulation products for the melting shop, when demanded.

We invite you to cooperation. We are waiting for your telephone (+48 22 670 11 81) or e-mail (office@continentaltrade.com.pl) inquiries. All contact details are available on our website on the Contact page.

Team of Continental Trade Sp. z o.o.  
ul. Krasnobrodzka 5; 03-214 Warszawa POLAND

Go back

Information clause

What personal data are processed and who is their administrator?

When using our services, personal data that we process may be, for example, the IP address of your device, data obtained from cookies or similar mechanisms for recording information in Users' devices, as long as they allow you to identify you. More information about the scope of personal data and cookies can be found in the Cookies policy and in Privacy policy.

Administrator, ie the entity deciding on which personal data will be processed and for what purpose, and in what way, is Continental Trade Sp. z o.o. (hereinafter "Continental Trade" or "We") with its registered office and address in Warsaw at Krasnobrodzka Street 5.

What is the purpose and basis of the processing of your personal data by Continental Trade ?

Continental Trade processes your personal data to enable you to use our services, match the displayed content and ads to your interests, measure quality and effectiveness, improve content and services.

The basis for the processing of personal data is the legitimate interest of Continental Trade. It includes improving services, ensuring their best quality and informing Users about them.

Confirming that you have read this information,   by clicking on "Go to website" or closing this window at the same time you agree that your personal data will be processed in the same way as described here. You can manage your consent, including withdrawal.

Providing personal information is voluntary.

What are your rights to   Continental Trade in terms of processed data?

You can request from Continental Trade: access to data, rectification, deletion, transfer and, in some cases, processing restrictions, and you have the right to object to the processing of your personal data when personal data are processed on the basis of the legitimate interest of the administrator. You have the right to file a complaint regarding the processing of your personal data to the President of the Office of Personal Data Protection.

To whom does Continental Trade share your personal data?

Continental Trade, in principle, does not share your personal data with third parties, except for situations in which Continental Trade has a legal basis, including at the request of authorized entities, or when it is necessary to perform services offered by Continental Trade, e.g. entrepreneurs providing hosting of our services.

How long does Continental Trade store your personal data?

Continental Trade stores Users' personal data only for the time that is necessary to achieve the purposes for which the data was collected and provided that one of the legal grounds described above is up-to-date or when a new ground has appeared, e.g. a law or the need to enforce claims in court proceedings.

Who can you contact for more information on the processing of personal data by Continental Trade?

If you have questions related to the processing of your personal data on websites operated by Continental Trade or would like to report the issue related to the processing of personal data by Continental Trade, you can contact a Continental Trade representative using the contact information: office@continentaltrade.com.pl.

More information on the protection of your personal data can be found in the Cookie Policy and Security Policy documents published on our website www.continentaltrade.com.pl