MINEX® ST A100 (particle size 10)  is a surface-treated nepheline syenite (NS) that is easily dispersed in a wide range of reactive resin systems. It is designed to provide superior performance in waterborne, solvent-based, 100% solids, and powder epoxy coatings, as well as phenolic resins and polysulfide adhesives. It also provides good performance in 2K waterborne polyurethane, 1K self-crosslinking acrylics, and waterborne polyurethane dispersions. Ideal end-use coatings applications for MINEX® ST A100 (particle size 10) include specialty and high-end reactive architectural, protective, general industrial, floor, powder, wood, and aerospace coatings.

MINEX® ST is available in three particle sizes—4, 7, and 10—and two functional treatments: A100 and OV100. It offers similar optics, handling, gloss, and color acceptance as the equivalent MINEX grades, while delivering improved dispersion and higher loading capacity in select systems—enabling cost savings and reduced VOC content.

MINEX® ST micronized functional fillers and extenders are proven performance enhancers across a broad range of paints, coatings, adhesives, sealants, and inks. Select surface treatments were developed to further enhance chemical and stain resistance, washability, adhesion, weatherability, optical clarity, color retention in tinted systems, abrasion resistance, and tensile strength—by compatibilizing the mineral surface with the host binder systems and reactive chemistries.

MINEX and MINEX ST functional fillers are produced from nepheline syenite—a naturally occurring, silica-deficient, sodium-potassium alumina silicate. Automated scanning electron microscopy confirms they contain less than 0.1% crystalline silica, with no detectable free crystalline silica in the mineral complex. All MINEX ST grades are processed and sized in strict adherence to Covia’s QIPSM quality assurance programs, ensuring consistently uniform chemistries, tight particle size distributions, and controlled top sizes for reliable performance.