Our materials / qualities

All our products would not work without high quality and perfectly matched raw materials. These raw materials can consist of the most diverse materials.
On this page we would therefore like to give you a very detailed overview of the materials we use. All raw materials of these materials go through a consequent incoming goods inspection at our company to ensure your and our quality standards at any time.
Our experienced staff will also be happy to answer any questions you may have about the optimal materials for your products.

Silicon Carbide Materials SICA

Silicon carbide is a synthetic raw material produced by the Acheson process. In this process, sand (SiO2) and carbon are mixed appropriately and made to react under high electrical and thermal energy. The operating temperature for SiC in oxygen-free atmosphere is possible up to above 2,300°C. SiC raw material used for refractory industry has purity from 96% to 99%. SiC can be simply ceramic bonded or high quality bonded with nitride phases.

The proportion in the respective backfill varies between 70% and 95% depending on the quality.

SiC is characterized by the following properties::

Application examples:

Fireclay materials HASSIA

Fireclay bricks are characterized for simple applications with different requirements. The Al2O3 content is used for the respective fireclay quality. Special attention for fireclay qualities is the low content of Fe2O3, which significantly improves durability for certain requirements in the steel industry. Fireclay qualities are often an inexpensive alternative in the lower temperature range. The maximum application temperature should not be operated above 1,450°C on a sustained basis.

Application examples:

Corundum materials DINIX

Depending on their Al2O3 content, corundum materials are characterized by very high application temperatures. The main component of the corundum materials is aluminum oxide, which, depending on the content, permits application temperatures of up to nearly 1,900°C. The raw materials used are high-grade corundum (produced by melting in an electric arc) and tabular alumina (produced by sintering in a shaft furnace). The mechanical strength can be rated as good to very good. In the refractory industry, corundum materials are generally used for high temperature requirements in continuous operation. By adding certain raw material components, the thermal-physical properties can be optimized with regard to special requirements.

Examples of applications:

Mullite materials MULLIDUR

Mullite materials differ on the raw material side by the use of fused mullite (2 Al2O3 * SiO2) and sintered mullite (3 Al2O3 * 2 SiO2). Mullite has very good thermal shock resistance, which makes this material ideal for higher application temperatures in discontinuous furnaces. As with corundum materials, special requirements can be met for mullite materials by selective blending with other raw material components. The application temperature depending on the quality is up to 1,800°C.

Application examples:

Sillimanite materials SILIDUR

Sillimanite materials are based on andalusite, a naturally occurring mineral. By thermal treatment (firing) the raw materials are converted into mullite. In the refractory industry, silimanite materials are used for thermal cycling.

Application examples:

Zircon mullite / zircon sand DYKODUR / ZIRKODUR

Materials containing zircon are characterized by high chemical resistance to molten glass and acidic melts. The thermal shock resistance can be significantly increased by mixing zircon and mullite. In the refractory industry, this material is used either as zircon mullite (production of the raw material in the electric arc furnace) or as zircon sand (raw material deposit). The application temperature in continuous operation should not exceed 1,700°C, depending on the quality.

Application examples:

Lightweight refractory materials SUPO

Lightweight refractory materials are insulating bricks which can be produced by the targeted selection of a wide variety of raw material components, depending on the requirements profile. For simple applications, organic-based burnout materials are added as raw materials. For this purpose, the residual ash content should be as low as possible. For higher requirements, synthetic raw materials (hollow spheroidal corundum) are used. In the refractory industry, these materials are used for primary (front area) or secondary (rear wall) insulation. Due to the insulating effect of the material, the range of applications is extremely wide, but should be adapted to the requirements profile in each case. The requirement profile can be optimized by certain additives on the raw material side. The application temperatures can reach up to 1,800°C.

Application examples:

Cordierite materials CORDIERIT

Cordierite materials are produced by thermal treatment of defined raw materials for targeted cordierite formation during firing. Cordierite is characterized by very good mechanical strength. The special feature of cordierite, however, is its optimum thermal shock resistance, which is due to its very low thermal expansion (expansion of the material under the influence of temperature). Cordierite materials have a very low density of about 2 g/cm3 , so that with the above-mentioned positive properties they are predestined as kiln furniture (low mass = low heat loss during heating = low energy consumption). The maximum operating temperature for cordierite materials is limited at 1,280°C.

Application examples:

Silica materials VITRODUR

Fused silica materials with a very high SiO2 content are characterized by very low thermal expansion (approx. 0.06% in the range up to 1,000°C). This allows extremely fast heating and unheating rates in thermal furnaces without weakening the material by cracking. The maximum temperature of use should be limited at 1,160°C, since above this the microstructure can be impaired by new mineral phase formation.

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