It is a base dielectric material. The plating portion of the wet process begins with an electroless Cu bath. ----- Forwarded Message ----- From: Ian Hanna <[log in to unmask]> To: "[log in to unmask]" <[log in to unmask]> Sent: Friday, March 23, 2012 12:47 PM Subject: Re: [TN] plating void do you mean base dielectric material, or base copper material -- an electrolytic copper plating void will still leave the base copper intact if it is caused by a bubble -- what is the shape of the edges, is it tapered or rounded -- is the void in the centre of the hole or towards the outside? any photos? could be electroless copper void electrolytic copper void tin void dry-film residue From: "[log in to unmask]" <[log in to unmask]> To: <[log in to unmask]> Date: 23/03/2012 03:41 PM Subject: [TN] plating void Sent by: TechNet <[log in to unmask]> ________________________________ I'm looking for input on the following plating defect. I observe a plating void that occurs on a Cu plated feature with ENIG finish. The void goes down to the base material. The defect is typically .002 diameter. The feature size is .010 across. The parts run on a manual plating line and hang on a small plating rack. The plating engineer believes the root cause of the void is a bubble on the part during plating. The action plan includes implementing stronger vibration on the part in the plating bath. I have two questions. 1. How much vibration is typically needed to avoid developing a bubble on a part during plating? 2. For this plating void defect, is it possible that Ni corrosion or other reliability concerns would eventually develop if defective parts escaped? Thank you, Mark Julstrom ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________