In the middle of the last century, a scientist employed by the Carborundum Company fulfilled the industrialized market requirements for a low-thermal-mass insulation material.

SGL Carbon is expanding and modernizing its soft-felt production. The company invested in an additional carbonization facility at its Meitingen site near Augsburg, Germany, that is now operational. Branded as Sigratherm materials, the carbon and graphite soft felts are used as high-quality insulation material in resistance-heated and induction-heated vacuum furnaces and in furnaces with an inert-gas atmosphere.

Most vacuum furnaces currently active in the heat-treating world incorporate some form of, or combination of, graphite-felt insulation, with either a foil or board internal facing in the furnace hot-zone construction. The graphite felt used in high-temperature furnaces is either PAN-based or Rayon-based.

HiE-Coat 840-C is a high-temperature, high-emissivity blackbody coating used for installations of gas-fired, refractory-fiber-insulated furnaces to improve thermal efficiency for applications to 2500°F.

As our economy continues to strengthen and steel production increases in the U.S., several of the mills that have been idled for years are beginning to come back on line.

This article will highlight advanced furnace design features, illustrating both yearly power savings and possible power-company rebates.

With the complete substitution of aluminum-silicate wool in its product range, Nabertherm GmbH was successfully able to comply in total with the requirements of TRGS 619, setting new standards in the furnace industry.

A versatile fiber, Superwool Sealcoat HT, is suitable for use in nearly a dozen furnace lining applications.