1、 Water glass shell

This process has been produced in China for nearly 50 years. After half a  century of unremitting efforts of colleagues in the investment casting   industry, the application and research of water glass shell technology has reached a high level. Over the years, the strength of water glass shell has doubled due to the improvement of refractory for back shell and the popularization and application of new hardener. Low cost, shortest production cycle, excellent shelling performance and high permeability are still the advantages of any other shelling technology.

2、 Composite shell

Compared with the water glass shell, the surface quality of the casting has been greatly improved, and the surface roughness, surface defects and repair rate have been reduced. Suitable for stainless steel, heat-resistant steel and other high alloy steel. The production cycle is much shorter than that of low temperature wax silica sol shell, which is similar to that of water glass shell.

3、 Silicasol (low temperature wax) shell

The process is in line with the national conditions. It has great adaptability and superiority when casting large and medium-sized castings of more than 1kg, especially those of more than 5kg. Compared with the composite shell, the shell quality is stable, especially the casting size accuracy is high, there is no sodium silicate, high temperature performance is good, after baking at 1000-1200 ℃, it has high permeability and creep resistance, which can be applied to thin-walled parts. Led parts, small and medium parts with complex structure, can also produce large parts with weight of 50-100kg, such as water pump, impeller, etc. Guide shell, pump body, ball valve body, valve plate, etc. For thin-walled small and medium-sized parts or large-scale parts, the fork shell or lifting shell can be poured directly in front of the furnace, and a higher yield can be obtained.

4、 Silicasol shell(middle temperature wax)

This is the general production process of precision casting in the world. It has casting quality and repair rate of. It is especially suitable for small and medium-sized castings (2-1000g) with high surface roughness and dimensional accuracy. However, due to the limitation of equipment and cost, it is rarely used for large and medium parts (5-100kg)