Original
By certification 
Mullite sand powder has been used as investment casting shell refractory. Compared with the quartz shell, the mullite shell has outstanding advantages.Including mullite sand for investment casting and mullite powder for investment casting
The product has the characteristics of high aluminum content, low iron content, small expansion coefficient and good thermal stability. The poured casting is easy to shell, not deformed, not easy to scale down, good finish, and high yield. The products use complex precision casting such as carbon steel, stainless steel, heat-resistant steel, etc., and are also suitable for investment casting of aluminum, titanium and other alloys
There are no cracks when pouring, the materials are simple, easy to operate, and conducive to production.
Chemical and physical of properties
Main physical properties
Item |
Index |
Grain size (mesh) |
10-16 16-30 30-60 200 270 325 Can also be produced according to customer requirements |
Refractoriness (℃) |
≥1730 |
Bulk density (g/cm3) |
≥2.45 |
Ignition (%) |
≤ 0.25 |
Powder content in sand (%) |
0.3 |
Hardness (Mohs) |
7-8 |
Ph value |
6-8 |
Main chemical indicators
SiO2(%) |
Al2O3(%) |
Fe2O3(%) |
TiO2(%) |
CaO+MgO(%) |
K2O+Na2O(%) |
50-52 |
≥43 |
≤1.2 |
≤0.6 |
<0.5 |
<0.4 |
http://www.runjinrefractories.com/
