Manufacturing shell materials can be divided into two types, one is used to direct the formation of type shell, such as refractories, binders, etc.; other in order to obtain high-quality shell, streamline operations, improve the process withmaterials, such as flux, hardening agent, surface active agent.

1) refractory
Refractories used in investment casting of quartz and corundum, and alumina silicate refractories such as refractory clay, bauxite, flint clay. Sometimes with zircon, magnesia (MgO), and so on.

2) binder
The most commonly used in investment casting binder silica colloidal solution (referred to as the silicate sol), such as ethyl silicate hydrolyzate, sodium silicate and silica sol. Composition of their substances silicate (H2SiO3) and solvents, and sometimes stabilizers, such as in silica sol of NaOH.



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