Yes John but there are lots of Sn/Pb pastes that can take a Pb-free reflow, but such products whether no clean or water wash don't answer the question. Mostly because its such an odd situation to hypothesise and because things like: OF what is the 3%? By weight or by volume? So I think some issues have been conflated, or something bas has happened like An error on line with paste types. So I don't think we can help until the situation has been probed a little. Best Wishes Mike-----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke Sent: Wednesday, November 14, 2012 10:03 PM To: [log in to unmask] Subject: Re: [TN] SnPb and Pb-free paste mixture Hi Amol how is life at AFG?? I would advise that they use leaded solder (heh heh) reflow at lead free temperatures peaking at say 240C and use a flux that is rated for lead free soldering. Such a leaded/flux combination can be obtained from AIM WS-488 63/37 is the part number for the paste Best regards John Burke General Manager/COO Zollner Electronics Inc Plant Milpitas 575 Cottonwood Drive Milpitas, CA 95035 Phone: + 1 408 434 5442 Fax: + 1 408 434 5401 Mobile: + 1 408 628 2433 E-mail: [log in to unmask] Internet: www.zollner-electronics.com -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane Sent: Tuesday, November 13, 2012 4:05 PM To: [log in to unmask] Subject: [TN] SnPb and Pb-free paste mixture Hi, We have this unusual (at least for me) request from a potential new customer. This is taken verbatim from their request for process information. Before I go and tell them this cannot be done, I want to ask the experts out on technet if they have seen/done something like this. My thinking is that this would be very hard to do on the floor unless there is a custom formulation available. I am not aware of their reasoning for asking this other than for a very unusual (and ineffective) way of mitigating tin whiskers. Leaving the potential flux incompatibilities aside, is this something that is being done/can be done? I could use some expertise or references/studies on # 2 as well. 1. "Since our products are not subject to RoHS and our customer is not requiring lead mitigation, is there a vendor preferred process of Pb based or Pb-free processing. a. Describe your history/experience and process for adding ~3% Pb to Pb-free paste and utilizing Pb-free processes. b. Any quality or reliability concerns adding ~3% Pb to Pb-free soldering. c. Describe your history/experience and processes used in transitioning a product from Pb to Pb-free (or reduced Pb). 2. Do you know of any issues with RoHS and reliability at -65C?" Thanks, Amol ________________________________ Confidentiality Notice This e-mail and any attachment(s) are intended for the individual or entity to which this email is addressed and may contain information that is confidential. If you are not the intended recipient or an employee or agent responsible for delivering this e-mail to the intended recipient, please be aware that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this in error, please notify the sender by telephone at 604.430.4336 or by return e-mail, and please delete or destroy all copies of this communication. Thank you! P Please consider the impact on the environment before printing this email or its attachments ______________________________________________________________________ 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________