- Time:Aug 04, 2023
Heavy castable is a high-density, high-refractory material that is often used as thermal insulation for various industrial equipment and structures. The following are the main physical and chemical indicators of heavy castables:
1. Density: The density of heavy castables is usually higher, generally above 2.0 g/cm³. High density helps provide better thermal insulation properties and compressive strength.
2. Fire resistance: heavy castables should have excellent fire resistance, and be able to maintain a stable structure in high temperature environments without obvious permanent deformation or cracking. They are usually composed of high-purity refractory particles, inorganic cementitious materials and additives to ensure that their physical and chemical properties can be maintained at high temperatures.
3. Compressive strength: Heavy castables need to have sufficient compressive strength to withstand external forces and gravity loads. The compressive strength depends on the material and formula used in the castable and can be adjusted according to actual needs.
4. Thermal conductivity: The thermal conductivity of heavy castables should be as low as possible to reduce heat conduction and improve thermal insulation performance. Lower thermal conductivity helps reduce heat loss and provides better energy savings.
5. Linear thermal expansion coefficient: The linear thermal expansion coefficient of heavy castables describes the degree of dimensional change of the material when the temperature changes. Matching the thermal expansion coefficients of the host structure and other materials reduces stress and thermal cracking.
6. Chemical corrosion resistance: Heavy castables need to have a certain degree of chemical corrosion resistance to resist the erosion of materials by corrosive media, acids and alkalis, etc. This makes them suitable for thermal insulation applications in environments such as the chemical industry.
7. Construction performance: The construction performance of heavy castables involves its plasticity, fluidity and ease of pouring. These properties are critical for pouring work in complex shapes or confined spaces.
In general, the physical and chemical indicators of heavy castables include density, fire resistance, compressive strength, thermal conductivity, linear thermal expansion coefficient, chemical attack resistance, and construction performance. These indicators determine the heat insulation performance, structural stability and ability to adapt to different environments of heavy castables. According to specific application requirements, suitable heavy castables can be selected to meet engineering requirements.
