Zirconium Powder is also named Zircon Flour, Zirconium Silicate Powder,Zircon sand, it’s an additive in friction materials,Tangshan Hanwei is a reliable supplier for Zircon flour specially for brake industry, and Zircon Flour Property as follow: 
1. Crystal system: Quadratic system =6.56A =5.97A
2. Refractive index: 1.95
3. Density: 4.6-4.7
4. Melting point: 2550° C
5. Transition point: 1550°C thermal decomposition(ZrO2+SiO2)
6. Coefficient of thermal expansion: 4.5× 10-6(20-1400)