Commercial decapsulation is increasingly done with automated machines. These typically spray hot nitric and / or sulphuric acid onto the chip. Usually they require special gaskets that are specific for each chip type. Many parts, such as the gasket, are made from PTFE.

====== Media ====== 
  * Ultratec: "Step 1 - decapsulation": http://www.youtube.com/watch?v=7Sav5pidFmQ&feature=related