1.To use when precision casting wax melting point is too high, easy to appear the phenomenon.
2.Precision casting mold shell, caused by improper ratio of materials.
3.Used in the precision casting mould of cohesion between the layers of the problem may come up.
4.In the process of precision casting dewaxing reactor pressure is too low, booster time is too long
5.Precision casting mold shell, poor permeability of materials.
6.Precision casting mould making process, uneven coating.
7.Problems of precision casting mould of surface sizing agent.