Sodium feldspar is fully applicable to ceramic frits and serves as one of the core raw materials. Its outstanding advantages over potassium feldspar, nepheline, and other materials include: the lowest fluxing temperature, the lowest cost, and the most stable glass phase — making it especially suitable for high-gloss transparent glazes and low-temperature fast-firing processes.
Lowest fluxing temperature: Theoretical melting point ~1100°C; practical melting range 1120–1250°C, significantly lower than potassium feldspar (1130–1450°C), effectively reducing frit firing temperature and saving energy.
Strongest high-temperature dissolution capacity: Fastest dissolution rate and highest dissolution degree for quartz, clay, and mullite at high temperatures — ideal for glaze formulation.
More stable glass phase: No new crystalline phases form during melting; the liquid phase composition remains similar to the un-melted feldspar, ensuring glass phase stability — perfect for transparent glazes.
Significant cost advantage: Abundant resources and low pricing; usage in low-temperature ceramics such as stoneware can reach 20%–40%.
Validated by actual formulations: Commonly used as a primary frit ingredient in industry patents (e.g., 8–10 parts), combined with quartz, borax, wollastonite, and other materials.
Narrow melting range: Viscosity drops rapidly as temperature rises; excessive use in the body may cause product deformation — dosage control is essential.
Relatively high thermal expansion coefficient: Overuse may lead to glaze crazing (cracking); blending with other oxides is recommended for adjustment.
Slightly lower body strength: Mechanical strength is inferior to potassium feldspar; for high-strength products, a potassium-sodium blend is advised (e.g., 60% potassium feldspar + 40% sodium feldspar).
Purity requirement: Fe₂O₃ content must be kept below 0.5% to avoid affecting whiteness.
For low-temperature fast-firing, high-gloss transparent effects, and cost control, sodium feldspar is the preferred choice for frit formulations. For products requiring high deformation resistance and wider firing tolerance, blending with potassium feldspar is recommended.
Ankai New Materials （LSAK Feldspar）provides a long-term, stable supply of high-quality sodium feldspar, quartz, nepheline, and potassium feldspar — reliable in quality, abundant in stock. If you are looking for a trustworthy raw material partner, feel free to contact us for a tailored formulation solution.
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