1.Shape: Sphere
2.Angle Factor: ≤1.1
3.Refractoriness: ≥1790℃
4.Thermal expansion: 0.13% (10 minutes under 1000℃)
General advantages CERAMSITE
1.Solid sphere: The shape of Ceramsite is spherical with smooth surface and less surface area and offering a very good flowability and filling ability. To compare with other sands else, less binder is used at the same mold strength and higher venting ability. It also offers the excellent collapsibility.
2.Lower thermal expansion rate: It makes the dimensions of castings better, less crack and defect and higher output.
3.Lower breakage rate: Ceramsite has a higher density and a very lower breakage rate at the reclaimation. It makes a better reclamations rate to reduce the waste sand and the pollution.
4.High refractoriness: The major chemistry is Al2O3 and SiO2, so mostly mullite and corundum phase in the Ceramsite which will make sure the high refractoriness and thermal stablity. And PH Value appears neutral. It is suitable for all kinds of metal and alloy castings.
Application Area and its advantage compare to traditional casting sand
1. In Vacuum(V)-casting and Lost-foam casting (LFC)
Silica sand in dry condition largely apply in Vacuum(V)-casting and Lost-foam casting (LFC).
Silica sand create a lot of dust in process which is very bad for environment and for workers health.
Ceramsite has high refractoriness than silica sand and high density in the mold by what we can achieve high castings surface quality and decrease the unqualified castings rate.
Ball shape ceramsite has better flowability than silica sand, so it can fill the special area like inside angel, deep groove, horizontal holes easier than silica sand. So it will decrease the defects of the castings and decrease the labor volume.
According to our experience, the sand cost can decrease 90% compared to silica sand and also discharge if the waste material will also be decreased.
In LFC, if we use resin and ceramiste, the resin cost will also be decreased by 1/3.
Ceramsite price is higher than silica sand. But if we take the above advantage into consideration, ceramsite is also the good choice for you. As the ceramsite has lower expansion rate. When we produce, iron castings especially Spheroidal graphite iron castings, casting mould has limited expansion resists on the castings expansion because of graphitization. So the castings may has shringage, to avoid which casting head is needed.