Particles pass through a 74-micron sieve opening. Equivalent to ~0.074mm. Coarser particle distribution — ideal where larger particles aid fluxing in bulk ceramic bodies at high tonnage.

Particles pass through a 44-micron sieve opening. Equivalent to ~0.044mm. Finer particle distribution — essential for glaze smoothness, suspension stability, and surface brilliance in ceramic coatings.

A 325 mesh feldspar has approximately 70–80% greater specific surface area than 200 mesh. Greater surface area = faster dissolution, better melting, and superior reactivity at kiln temperatures.

Finer mesh grades begin melting and fluxing earlier in the firing cycle. In glaze applications, this translates to smoother melt initiation, reduced crawling, and better gloss levels even at lower peak temperatures.

The dominant application. 200 mesh provides ideal particle size for ball milling integration in spray-dried tile body formulations, with 18–22% typical loading. It acts as the primary flux, driving vitrification at 1180–1220°C.

Used at 15–25% loading in sanitary casting slips. The 200 mesh grade flows well through spray dryers and press systems without clogging, maintaining excellent rheological properties.

Floor tiles require the robustness of a 200 mesh body feldspar. It provides dimensional stability, controlled shrinkage, and sufficient fluxing for high-density, low-porosity bodies (<0.5% absorption).

Electrical insulators, spark plug bodies, and industrial ceramics use 200 mesh feldspar where dimensional consistency, controlled vitrification, and electrical properties are more important than surface gloss.

The single most important application for 325 mesh. Glaze formulations use 20–40% feldspar as the primary network modifier and flux. The finer particle size ensures homogenous melt, excellent gloss, superior adhesion, and defect-free surfaces.

Engobes — intermediate coatings between body and glaze — demand 325 mesh for smooth application via screen printing, roller coating, or bell application. Coarse particles cause pinholing and uneven coverage.

Premium tableware and fine china products use 325 mesh as both a body and glaze material. At this fineness, feldspar dissolves evenly into the glassy matrix, producing translucency and exceptional whiteness.

Frit manufacturers use 325 mesh feldspar to ensure complete dissolution during frit firing at 1100–1300°C. Residual coarse particles create defects in the frit glass matrix, making fine mesh essential.

High-purity 325 mesh (and finer) feldspar is used in cosmetics as a light-diffusing mineral in foundations, powders, and skincare. Requires ultra-low Fe₂O₃ (≤ 0.05%) and microbial compliance.

Modern inkjet-decorated tiles require ultra-fine base glazes where 325 mesh feldspar ensures the ground coat is perfectly smooth, enabling nanometre-level inkjet drop absorption without bleeding or migration.