Zirconium Silicate (Zircon Flour)

Zirconium Silicate, commonly known as Zircon Flour, is a high-purity specialty mineral produced from natural zircon. Each production lot is manufactured under strict quality control and tested to ensure consistent chemical composition and particle size distribution.

Available in multiple particle size grades including 75 µm, 45 µm, 5 µm, and 1.2 µm, zirconium silicate is widely used in foundry, investment casting, refractory, and ceramic industries. The material features fine powder consistency with off-white to cream coloration.

Main Applications

Investment casting shell and core materials
Foundry molds and cores
Refractory coatings for high-temperature furnaces
Glaze opacifiers for ceramics and tiles
Grinding media and polishing compounds
Abrasives for precision grinding

Technical Specifications

Chemical Composition (by Weight %)

Ingredient	Unit	75 µm	45 µm	5 µm	1.2 µm
Zr(Hf)O₂	% Min	65.0	65.0	65.0	65.0
TiO₂	% Max	0.15	0.15	0.15	0.15
Fe₂O₃	% Max	0.10	0.10	0.10	0.10
Al₂O₃	% Max	0.70	0.70	0.70	0.70
SiO₂	% Max	—	—	—	33.0
U + Th	ppm	≤750	≤750	≤750	≤750
Moisture (110 °C)	% Max	0.10	0.10	0.10	0.10

Physical Properties

Appearance: Fine powder, off-white to cream color

Particle Size Distribution: Measured using Mastersizer 3000

75 µm (D97 < 75 µm) · 45 µm (D97 ≤ 45 µm) · 5 µm (D97 ≤ 5 µm) · 1.2 µm (D50 ≤ 1.2 µm)

Packaging

Zirconium Silicate is supplied in 25 kg / 50 lb bags. 1-ton jumbo bags are available upon request. All products can be palletized and shrink-wrapped for safe transportation.