is a fertile garden for the growth of tin whiskers......what romantic...technopoetry ! Inge On 20 March 2012 19:50, Stadem, Richard D. <[log in to unmask]>wrote: > Tin whiskers can grow in leaded circuits, ie, CCAs soldered with Sn63. The > issue is that the parts need to be tinned of their lead-free original > finish, and the ENTIRE LEAD then must be tinned with Sn63. If you leave a > portion of a SAC305-finished lead untinned, the line of demarcation between > the Sn63 solder and the SAC305 > C > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo > Sent: Tuesday, March 20, 2012 12:57 PM > To: [log in to unmask] > Subject: Re: [TN] Out of the world tin whiskers > > I thought space is exempt for leadfree. Why? > -------------------------- > Sent using BlackBerry > > > ----- Original Message ----- > From: Inge Hernefjord [mailto:[log in to unmask]] > Sent: Tuesday, March 20, 2012 01:47 PM > To: [log in to unmask] <[log in to unmask]> > Subject: Re: [TN] Out of the world tin whiskers > > DO THEY NEVER LEARN! > > Inge > > On 20 March 2012 18:08, Gervascio, Thomas L <[log in to unmask] > >wrote: > > > Tin whiskers at Saturn > > > > PASADENA, Calif. -- The Cassini plasma spectrometer instrument (CAPS) > > aboard NASA's Cassini spacecraft at Saturn has resumed operations. > Mission > > managers received confirmation on Friday, March 16, that it was turned > on. > > They plan to monitor the instrument for any unusual behavior. > > Last June, short circuits in the instrument led to unexpected voltage > > shifts on the spacecraft. As a precaution, mission managers turned off > the > > CAPS instrument while engineers investigated the issue. The investigation > > led to the conclusion that tin plating on electronics components had > grown > > "whiskers." The whiskers were very small, less than the diameter of a > human > > hair, but they were big enough to contact another conducting surface and > > carry electrical current. Researchers are still trying to understand why > > whiskers grow on tin and other metals, but they know now that whiskers > can > > grow in space and on Earth. It is believed that these or additional tin > > whiskers that may grow on Cassini cannot carry enough current to cause > > problems, but will burn out on their own like a lightweight fuse. > > > > > > > > ______________________________________________________________________ > > 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 transmission (including any attachments) may contain confidential > information, privileged material (including material protected by the > solicitor-client or other applicable privileges), or constitute non-public > information. Any use of this information by anyone other than the intended > recipient is prohibited. If you have received this transmission in error, > please immediately reply to the sender and delete this information from > your system. Use, dissemination, distribution, or reproduction of this > transmission by unintended recipients is not authorized and may be unlawful. > > ______________________________________________________________________ > 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] ______________________________________________________________________