J-STD-003 and IPC-4552 basically state the ENIG should meet category 3 (>6 months storage). My question is, what is the storage threshold for ENIG after the 6 months? 1 year, 2 years? What length of time should we conceivably expect to be able to store an ENIG board before seeing issues? Scenario: PCBs just over a year old are showing signs of oxidation after processing, components can be flicked off with ease. The Cu and Ni (if any left) on a PTH look horrendous after processing. Here's a kicker, these boards are date code 3414, but date code 3514 appears to be ok and solders fine, and date code 3114 shows a very low and random case of the oxidation/solderability issue. All PCBs stored in the same environment/manner Craig Sullivan Manufacturing Engineer / IT Administrator Phone: (607) 266-0480 x115 Fax: (607) 266-0482 Email: <mailto:[log in to unmask]> [log in to unmask] Web: <http://www.mplinc.com/> www.mplinc.com MPL, Inc. 41 Dutch Mill Road | Ithaca | NY | 14850 P Please consider the environment before printing this e-mail. _____ Confidentiality Notice: This e-mail contains privileged and confidential information which is the property of MPL Incorporated, intended only for the use of the intended recipient(s). Unauthorized use or disclosure of this information is prohibited. If you are not an intended recipient, please immediately notify MPL Incorporated and destroy any copies of this email. Receipt of this e-mail shall not be deemed a waiver by MPL Incorporated of any privilege or the confidential nature of the information. Export Control: This message is intended only for the addressee and may contain information that is company confidential or privileged. Any technical data in this message may be exported only in accordance with the U.S. International Traffic in Arms Regulations (22 CFR Parts 120-130) or the Export Administration Regulations (15 CFR Parts 730-774). Unauthorized use is strictly prohibited and may be unlawful. If you are not the intended recipient, or the person responsible for delivering to the intended recipient, you should not read, copy, disclose or otherwise use this message. If you have received this email in error, please delete it, and advise the sender immediately. ______________________________________________________________________ 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] ______________________________________________________________________