We're fused silica sand and powder manufacturer/factory: Consistent Quality,Best Price and Severice!!!
Investment casting, also known as Precision casting or lost-wax process, is used to manufacture products for the automotive, military, aerospace, medical, commercial, and recreational markets.
Most investment casting foundries use Zircon Flour for making the primary slurry. Zircon continues to be in short supply and the prices are rising. We are thus promoting the use of Fused Silica sand and flour in primary slurry and rainfall sander because of the following advantages:
1) Decrease in material consumption
Fused Silica's density is 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) Increased 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) 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 is cheaper.
The typical specification sheet of Chem&Size minerals Fused Silica sand/grains and powder/flours for your perusal.
Quality control is shown on following four factors.
| One |
Physical Properties |
| 1 |
Composition |
SiO2 |
| 2 |
Structure |
Amorphous |
| 3 |
Colour |
Transparent or white |
| 4 |
Melting Temperature |
approx. 1750ºC |
| 5 |
Specific Gravity |
2.21g/cm3 |
| 6 |
Hardness |
7 Mohs |
| 7 |
Thermal Expansion |
0.5*10-6 |
| Two |
Chemical Composition |
| |
Grade |
For use in investment casting |
| 1 |
SiO2 |
>99.85% |
| 2 |
Al2O3 |
<200ppm for sand |
| Al2O3 |
<1000ppm for 200mesh powder |
| 3 |
Fe2O3 |
<100ppm |
| 4 |
MgO |
<50ppm |
| 5 |
CaO |
<50ppm |
| 6 |
Na2O+K2O |
<100ppm |
| 7 |
Magnetics |
<100ppm |
| Three |
Particle Size Distribution |
| |
Mesh |
mm |
10-20 |
30-50 |
50-100 |
-200 |
| 1 |
10 |
2 |
<1 |
|
|
|
| 2 |
20 |
0.85 |
80-95 |
0-0.5 |
|
|
| 3 |
30 |
0.6 |
2-16 |
25-35 |
|
|
| 4 |
40 |
0.425 |
|
34-48 |
|
|
| 5 |
50 |
0.3 |
0-4 |
16-32 |
3-12 |
|
| 6 |
100 |
0.15 |
|
0-10 |
72-87 |
0-1 |
| 7 |
140 |
0.106 |
|
|
5-16 |
0-4 |
| 8 |
200 |
0.075 |
|
|
0-3 |
3-9 |
| 9 |
325 |
0.045 |
|
|
|
13-20 |
| 10 |
Pan |
0-2 |
0-0.5 |
0-1.5 |
|
| |
|
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