Import 325 Mesh Wollastonite For Ceramics — Buy in wholesale FOB from Supplier in China

This 325 mesh wollastonite powder from Shenyang Huakuang is a calcium metasilicate (CaSiO3) mineral product engineered for ceramic glaze applications, with specified chemical composition of minimum 50% SiO2 and 43% CaO by mass. The 325 mesh designation indicates particle size distribution where material passes through a 325 mesh sieve, corresponding to a nominal d95 of 45 microns or finer in standard powder processing. The supplier specifies whiteness of 88-91, a critical optical property for ceramic glazes where colour purity affects final fired appearance. Loss on ignition (LOI) is capped at 1.5% maximum, indicating controlled carbonate content and thermal behaviour during glaze firing.

Wollastonite's acicular (needle-like) crystal habit, though not explicitly stated by this supplier, is the characteristic morphology that provides beneficial properties in ceramic systems. The low coefficient of thermal expansion typical of wollastonite reduces glaze crazing. The specified iron oxide maximum of 0.5% is essential for whiteware and porcelain applications where Fe2O3 above this level causes undesirable grey or yellow discoloration after firing. Magnesium oxide is limited to 1.5% max, maintaining the calcium silicate phase purity. The 325 mesh grind is finer than 200 mesh but coarser than 1250 mesh or 2500 mesh ultra-fine grades also listed, positioning it as a general-purpose ceramic glaze grade rather than a specialised superfine filler.

Primary application is ceramic glaze formulation, where wollastonite functions as a fluxing agent, reduces thermal expansion, and improves glaze fit to clay body. The 325 mesh size provides adequate dispersion in glaze slurry while maintaining sufficient particle surface area for fluxing reaction. Other typical uses include ceramic tile bodies, sanitaryware, and porcelain insulators, though the supplier specifically highlights glaze. B2B buyers should confirm whether this is crushed and milled natural wollastonite or processed product, request particle size distribution data (d50, d90) rather than just mesh pass, and verify ceramic glaze compatibility. The 0.00% response rate necessitates direct enquiry for MOQ, packaging, lead time, and certification.

Shenyang Huakuang is based in Shenyang, Liaoning province, China (postal code 10000). Liaoning province contains significant wollastonite mineral deposits, particularly in the Dandong and Benxi regions, providing raw material proximity that may benefit this supplier. The 'harbor' trust tier designation should be clarified directly with the supplier regarding its specific meaning and verification basis. Response rate is 0.00% with zero average response hours, so no communication history is available through this platform and buyers must initiate direct contact to assess responsiveness and English-language capability.

The listing provides chemical composition and application focus but does not state mining versus trading status, processing equipment, quality control laboratory accreditation, annual production volume, number of employees, export experience, or specific ceramic industry customers. Buyers should request ISO 9001 or ceramic raw material supplier certification, details of whether the company operates mines or processes purchased ore, and whether they offer additional grades such as surface-treated or calcined wollastonite. The address in Shenyang city centre rather than a mining district may indicate trading or administrative office rather than production facility, which should be confirmed.