Corrosion Resistant 12mm Thick Welded PTFE Small Etching Tank With White PP Outer Tank For Semiconductor Wet Process Product Overview Overview This small welded PTFE etching tank is specially designed and manufactured for high-purity semiconductor wet process and wafer etching applications. The inner tank is made of 12mm thick pure PTFE sheet, fully welded with advanced seamless welding technology to ensure excellent structural integrity, zero liquid penetration and long