Investment Casting Tolerances means the dimension range that can be meet by investment casting. There are a variety of investment casting processes, such as lost wax casting, lost foam casting and solica sol casting. Each casting process has its own casting forming ways and is suitable for different types of products. Tolerances may be affected by a number of factors. Such as die temperature, wax or plastic temperature, injection pressure, mold or shell composition, back up sand, firing temperature, rate of cooling, position of the part on the “tree”, and heat treat temperature all bear directly on tolerances required in the investment casting industry. Althought there is a tolerance standard in investment casting industry, it may still vary from foundry to foundry, as some may be specialized in thin wall small parts, and others could be more professional in larger parts. Also the equipments may also has a certain effect on the casting tolerances.