The Use of Mullite PolyLight Bricks and the Use Temperature of Different Grades

Mullite polylight bricks are generally marked with JM, where J is the first letter of the pinyin of polylight and M is the first letter of the pinyin of mullite. They are mainly used for heat preservation in the linings of various high-temperature furnaces to improve the heat preservation effect of high-temperature furnaces and reduce energy consumption. Mullite polylight bricks are also used in the heat preservation of equipment in thermal power plants, nuclear power plants, etc.

RS Mullite PolyLight Bricks for Sale
RS Mullite PolyLight Bricks for Sale

Free Quote

    Free Quote

    Your Name (required)


    Your Email (required)

    Your Phone

    Required Products (required)

    Enquiry Information

    The Use Temperature of Different Grades of Mullite Polylight Bricks

    However, different grades of mullite polylight bricks are used at different temperatures. Insulation mullite bricks are generally divided into different grades of JM-23, JM-26, JM-28, JM-30, and JM-32 according to national standards. JM-32 is not used much. The use ratio of JM-23, 26, and 28 is more.

    • JM-23 mullite polylight bricks, Al2O3 is 48%, and the use temperature is 1300℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1300℃×24h is ±1.
    • JM26 mullite polylight bricks, Al2O3≥55%, and the use temperature is 1400℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1400℃×24h to 0.7-0.8.
    • JM28 mullite poly light brick, Al2O3 at 65%, use temperature at 1500℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1500℃×24h to 0.7.
    • JM30 Al2O3 at 72%, use temperature at 1600℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1600℃×24h to 0.6.
    • JM32 is not often used, and is generally customized according to the special requirements of users.

    Different grades of mullite poly light bricks can be used at different use temperatures. Different grades of mullite bricks are selected according to the temperature and use conditions of the user’s kiln and different furnace types. Rongsheng Refractory Factory can also customize and produce polylight mullite bricks according to customer’s specifications.

    Application of RS Mullite Bricks
    Application of RS Mullite Bricks

    Free Quote

      Free Quote

      Your Name (required)


      Your Email (required)

      Your Phone

      Required Products (required)

      Enquiry Information

      High Temperature Furnace Mullite Insulation Refractory Brick Factory

      Mullite insulation brick physical and chemical indicators. Mullite insulation brick, as a material commonly used in building insulation, has excellent insulation performance and mechanical strength. Rongsheng Refractory Factory will elaborate on the physical and chemical indicators of mullite insulation bricks, covering thermal conductivity, compressive strength, water absorption and other aspects.

      1. Heat conductivity is an indicator to measure the thermal conductivity of materials, usually expressed as λ, with the unit of W/(m・K). The thermal conductivity of mullite insulation bricks is mainly affected by factors such as the density, porosity and composition of the material. Generally speaking, the lower the density and the higher the porosity of mullite insulation bricks, the lower its thermal conductivity. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K) to ensure its excellent insulation performance. To achieve this requirement, manufacturers usually take measures such as controlling the raw material ratio and optimizing the process to reduce the thermal conductivity of the brick body.
      2. Compressive strength is an indicator used to measure the compressive performance of materials, usually expressed in MPa. The compressive strength of mullite insulation bricks is directly related to their service life and safety performance in building structures. Generally speaking, the higher the compressive strength of mullite insulation bricks, the more they can withstand external loads. According to national standards, the compressive strength of mullite insulation bricks should be greater than 1.5MPa. In order to improve the compressive strength of mullite insulation bricks, manufacturers usually use methods such as adding reinforcing materials and adjusting the firing process to improve them.
      3. Thermal conductivity is an indicator that describes the thermal conductivity of a material, usually expressed in K, with a unit of W/(m・K). The thermal conductivity of mullite insulation bricks is the ratio of thermal conductivity to material thickness, which is used to calculate heat transfer per unit area. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K). By controlling the thermal conductivity and thickness of the brick body, the thermal conductivity of mullite insulation bricks can be effectively reduced and its insulation performance can be improved.
      4. Density is an indicator that measures the relationship between material mass and volume, usually expressed as ρ, with the unit of kg/m³. The density of mullite insulation brick directly affects its thermal conductivity and compressive strength. Generally speaking, the lower the density of mullite insulation brick, the lower its thermal conductivity, but the compressive strength will also be reduced accordingly. Therefore, when designing, it is necessary to weigh the requirements of thermal insulation performance and structural strength and select an appropriate density.
      RS Mullite Bricks Manufacturer
      RS Mullite Bricks Manufacturer

      Free Quote

        Free Quote

        Your Name (required)


        Your Email (required)

        Your Phone

        Required Products (required)

        Enquiry Information

        Rongsheng Mullite Insulation Brick

        The physical and chemical indicators of mullite insulation bricks are an important basis for evaluating their insulation performance and performance. By controlling the thermal conductivity, compressive strength, water absorption and other indicators of the brick body, the insulation effect and service life of mullite insulation bricks can be improved.

        In actual use, it is necessary to select suitable mullite insulation bricks based on the specific requirements and environmental conditions of the building. At the same time, manufacturers also need to continuously improve the process and material formula to improve the performance and quality of mullite insulation bricks to meet market demand.

          Get Free Quote

          Your Name (required)

          Your Email (required)

          Your Phone

          Required Products (required)

          Enquiry Information

          Why can Mullite Bricks be Used as Thermal Insulation Materials?

          Mullite brick is a refractory brick made mainly of mullite, a mineral compound composed of alumina (Al2O3) and silicon dioxide (SiO2). It is famous for its excellent thermal stability, high melting point and thermal shock resistance. Why can mullite brick be used as thermal insulation material? First of all, we need to understand the characteristics of mullite brick.

          Features of RS Premium Mullite Bricks

          RS premium mullite bricks have some of the following key features:

          RS Mullite Bricks Manufacturer
          RS Mullite Bricks Manufacturer

          Free Quote

            Free Quote

            Your Name (required)


            Your Email (required)

            Your Phone

            Required Products (required)

            Enquiry Information

            1. High-temperature resistance: Mullite bricks can withstand high temperatures, typically ranging from 1600°C (2912°F) to 1800°C (3272°F). Even at high temperatures, it maintains strength and structural integrity, making it suitable for use in high-temperature conditions.
            2. Low thermal conductivity: Mullite bricks have low thermal conductivity, which means it can provide good insulation and reduce heat loss in high-temperature environments. This feature makes it valuable for applications that require insulation or energy efficiency.
            3. Excellent thermal shock resistance: Mullite bricks have excellent thermal shock resistance, which means it can withstand rapid temperature changes without cracking or flaking. This feature is critical for applications involving cyclic heating and cooling, such as furnaces, kilns, and reactors.
            4. Chemical resistance: Mullite bricks have good resistance to chemical attack by acids, alkalis, and molten materials. This makes it suitable for chemical processing, metal refining and other industrial applications that may come into contact with corrosive substances.
            5. Wide application: Mullite bricks are widely used in various industries such as ceramics, glass manufacturing, steel production, petrochemicals, and non-ferrous metals. It is often used in furnace linings, kiln furniture, hot gas pipes, regenerators and other demanding thermal environments.

            RS factory mullite bricks are available in different shapes and sizes to meet specific installation requirements. For example, standard bricks, special shapes or custom designs. Contact Rongsheng for detailed information.

            Why can Mullite Bricks be Used as Thermal Insulation Materials?

            In general, mullite bricks have high-temperature resistance, thermal shock resistance, and chemical durability. This makes it a valuable refractory material in many industrial environments. In these industrial environments, reliable heat conduction and thermal stability are essential.

            JM26 Lightweight Mullite Insulation Bricks for Sale
            JM26 Lightweight Mullite Insulation Bricks for Sale

            Free Quote

              Free Quote

              Your Name (required)


              Your Email (required)

              Your Phone

              Required Products (required)

              Enquiry Information

              Mullite polylight bricks are a kind of lightweight insulation bricks, also known as mullite insulation bricks. It has good thermal insulation effect, and its small body density and light weight are also one of its characteristics. At present, it is widely used in glass melting furnace upper structure material channel bricks, modification plates, and processing kiln upper structure. Insulation and heat insulation layer of firing kilns, smelting kilns, refining devices, heating devices, and other thermal equipment.

              Because mullite polylight insulation bricks have a high porosity, they cannot bear excessive loads when using mullite insulation bricks, and must avoid contact with molten metal, slag and high-temperature furnace dust. When laying mullite insulation bricks, brick joints and expansion joints should be arranged correctly to avoid squeezing the masonry due to expansion. Mullite insulation bricks should not be subjected to strong mechanical vibration, impact and friction.

              Layered structure: The molecular structure of mullite has a layered arrangement, which allows it to expand when heated to form an insulating air layer. This structure enables mullite bricks to effectively reduce the conduction of heat. Therefore, it exhibits good thermal insulation performance in high temperature environments.

              Lightweight material: Mullite bricks are a lightweight material, so they do not add much weight when used in construction. This makes it suitable for various insulation applications, such as insulation boards, insulation materials, and furnace linings.

              Refractory: Mullite bricks have high refractory properties and can withstand high temperatures without decomposing or melting. This makes it an ideal insulation material for high-temperature equipment such as furnaces, stoves, fireplaces, etc.

              In general, the reason why mullite polylight bricks can be used as insulation materials is mainly because its density, chemical properties, layered structure, lightweight characteristics and refractory properties make it have good thermal insulation performance in high temperature environments. These characteristics make it one of the important materials in a variety of industrial and construction applications.

              Are Lightweight Mullite Bricks Acid-Resistant?

              Lightweight mullite bricks usually have a certain degree of acid resistance, but their specific corrosion resistance will be affected by many factors, including the composition of mullite bricks, preparation process, strength of acidic environment and special requirements.

              Mullite brick is a refractory material with mullite as the main component. Mullite is a mixture of alumina (Al2O3) and aluminum silicate (Al2Si2O7), which has good high temperature resistance, thermal shock resistance and corrosion resistance. Mullite bricks contain a higher proportion of alumina, which makes it acid-resistant to a certain extent.

              However, the strength and type of acidic environment also have an impact on the corrosion resistance of mullite bricks. Generally speaking, mullite bricks may show good corrosion resistance in mildly acidic environments, but corrosion may still occur in harsh strong acidic environments.

              If mullite bricks need to be used in special acidic environments, it is recommended to understand their corrosion resistance in detail when selecting materials, and may take additional protective measures. For example, adding anti-corrosion coating or choosing other corrosion-resistant materials that are more suitable for specific acidic environments. It is recommended to conduct relevant experiments and tests before actual use to ensure that lightweight mullite bricks can meet the requirements in specific acidic environments.

                Get Free Quote

                Your Name (required)

                Your Email (required)

                Your Phone

                Required Products (required)

                Enquiry Information