As an indispensable flux raw material in the ceramic industry, the particle size distribution of sodium feldspar has a significant impact on the density, whiteness, firing temperature and crack resistance of ceramic products. Different particle sizes of sodium feldspar (100 mesh, 200 mesh, 325 mesh) have different effects in ceramic bodies, glazes and firing processes, providing important support for performance optimization and cost control of ceramic products.
Sodium Feldspar (NaAlSi₃O₈) is an important feldspar mineral in ceramic formulations. Its main function is to act as a flux during the firing process at 900-1200°C, reducing melt viscosity, promoting liquid phase formation, and accelerating green body densification. According to statistics from the China Ceramic Industry Association, in 2024, about 78% of ceramic tile and daily-use ceramic companies in the country will use sodium feldspar as a feldspar flux, among which the proportion of 325 mesh products is increasing year by year.
100-mesh sodium feldspar is mainly used in the formulation of ceramic bodies because of its relatively coarse particles. Before the ceramic body is fired, 100-mesh sodium feldspar is used as an impoverishing agent to effectively reduce the drying shrinkage and deformation of the body, thereby improving the drying performance of the body and shortening the drying time. This feature is particularly important for the production of large ceramic products (such as floor tiles or exterior wall tiles), which can significantly reduce the risk of cracking caused by improper drying.
In addition, 100-mesh sodium feldspar is used as a flux during the firing process to reduce the firing temperature of the body, promote the densification of the body, and reduce the porosity, thereby improving the mechanical strength and durability of the product. Taking a well-known ceramic company as an example, adding an appropriate amount of 100-mesh sodium feldspar to the polished tiles it produces not only improves the stability of the body, but also reduces the firing energy consumption by about 5%, significantly saving production costs.
200-mesh sodium feldspar is one of the most widely used specifications in the ceramic industry. It has a moderate particle size and can be used in both body formulation and glaze formulation. In the body, 200-mesh sodium feldspar further refines the particle distribution, can fill the body structure more evenly, and enhance the light transmittance and surface smoothness of the body. This is particularly important for the production of high-end tiles, as it can significantly improve the gloss and aesthetics of the products.
In the glaze formula, 200-mesh sodium feldspar can improve the fluidity and coverage of the glaze, and improve the smoothness and wear resistance of the glaze due to its fine particles and high alumina content. In addition, the low iron content of sodium feldspar can effectively reduce the spots and impurities in the glaze, ensuring that the ceramic products present a pure color. According to industry data, the proportion of 200-mesh sodium feldspar used in high-end ceramic glazes has increased from 20% in 2015 to 35% in 2024, showing its important position in the high-end ceramic market.
Due to its ultra-fine particle characteristics, 325 mesh sodium feldspar is mainly used in the preparation of high-precision ceramic products and advanced glazes. Its extremely fine particle size can significantly improve the density of the body and the smoothness of the glaze, and is particularly suitable for the production of thin-bodied porcelain, artistic ceramics, and ceramic products with high light transmittance. 325 mesh sodium feldspar can melt more evenly during the firing process, further reducing the firing temperature, reducing energy consumption, and improving the thermal shock resistance of the product.
In the field of refractory ceramics, the low thermal expansion coefficient of 325 mesh sodium feldspar helps to reduce cracks caused by thermal stress, while its high alumina content promotes the formation of mullite, thereby enhancing the high temperature resistance of the ceramic. In addition, in some special ceramics, the ultra-fine particles of 325 mesh sodium feldspar can ensure higher chemical stability and electrical insulation performance to meet the needs of precision manufacturing.
Sodium Feldspar is an important raw material for the ceramic industry. Its 100 mesh, 200 mesh, 325 mesh and other specifications are widely used in different ceramic fields, effectively improving product performance and helping the industry to develop green and efficiently. Henan Ankai New Materials Co., Ltd. relies on advanced technology and strict quality control to focus on providing high-quality sodium feldspar to meet the diverse needs of ceramic companies. Welcome to inquire for more specifications and application details.
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