Shotblasting is generally known as film removal methods for PVD, CVD, and TD.
Shotblasting with compressed air or bladed wheels will apply metal media as blasting objects to remove the film. However, shotblasting with metal media will create minute concave and convex on the surface and time the media are really hitting the area and places appropriately shotblasted will create removal differences. Additionally, the media sometimes stay in the dies. Control over shotblasting is difficult.
On the other hand, chemical dissolving method will be able to have consistent removal of the film by controlling and setting chemical, dipping conditions appropriately set for the materials of the dies.
* Inappropriate setting for chemical dipping removal will eat into the material so we have to pay attention about the setting conditions of the dipping removal carefully.