STKO 105 – Alumino Silicate Sand (Grain)

STKO 105 is a high-quality alumino-silicate grain for precision investment casting use.

STKO 105 is a fine alumino-silicate refractory grain, designed for use on the primary slurry coat where smooth surface finish and high detail replication are essential. With a particle size distribution centered around 105 microns (about U.S. #140 mesh), this grain fills in micro-voids and contours to deliver sharp, clean castings. It is particularly well suited for use with colloidal silica binder systems and provides excellent stability during drying and firing. STKO 105’s controlled particle shape and low impurity levels reduce the risk of inclusions or surface defects, making it ideal for aerospace, medical, and precision industrial castings. The grain's high refractoriness also ensures thermal reliability during molten metal contact, while its consistency supports dependable slurry performance across production cycles.

Common uses include primary slurry layers, fine detail casting, and surface-critical applications where finish and dimensional accuracy matter.

Ships in 50 lb. bags. Larger orders available in Super Sacks.