fused silica sand,fused silica grains,fused silica powder,fused silica sand can be made cearmic slurry and shell in the process of making investment casting.

Investment casting, also known as Precision casting or lost-wax process, is used to make precision products for the industiry of machine,automotive, military, aerospace, medical, commercial, and recreational.

      Most investment casting foundries use Zircon Flour for making the primary slurry. Zircon continues to be in short supply and the prices are rising. Many clients use the Fused Silica sand,used silica powder,fused silica grains,fused silica flour in  the dipping and coasting process to make primary slurry and rainfall sander to form a hard shell because of the following advantages:

1) Fused silica decrease in material consumption
       Fused Silica's density is 2.21g/cm3,just roughly half of Zircon's density. If Zircon flour is replace 20% in primary slurry batch with Fused Silica, it needs lesser material by weight. For example if  slurry mix had 50 kgs of Zircon and try and replace 10 kgs then it would need to add around 6 kgs of Fused Silica flour to achieve the existing viscosities and flow properties.

2) Fused silica increase permeability and porosity
       Zircon is very dense. Fused Silica is lighter and does not pack as tightly as Zircon which is why it helps in improving the permeability of your shell. It is also more porous.

3) fused slica ceramic shell is Easier knock-out
       Fused Silica knocks out much easier than Zircon or Alumino-Silicates. This is because of the Cristobalite formation while pouring which easily breaks down upon cooling.

4) Faster leaching and shell removal
        the moment to add fused silica in the shell it helps in the leaching process and it is much easier to remove shell materials off cavities and holes.

5) Fused Silica price is cheaper.

The typical specification sheet of Chem&Size minerals Fused Silica sand,fused silica grains and fused silica powder and fused silica flours for your perusal.