HI Reverting back to this question, by serendipity this link came up on an unrelated web search www.exremetemperatureelectronics.com Regards Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner Sent: Tuesday, February 22, 2011 3:03 PM To: [log in to unmask] Subject: Re: [TN] Low Temp Alloys Hi Yes Indium maintains its ductility/flexibility in liquid gas/cryogenic applications and is used extensively for making compression seals and so on. As a solder it and its alloys (60In/40Pb is a near MP drop in for SN63) are used in this zone, and have advantages, disadvantages, properties which need to be considered. Similarly PB also remains fairly ductile. Joyce's advice is good, the alloys are stable at that temp, everything is. From my slightly limited experience - not too many people do this stuff and then in specialist apps - just as in high end apps its not so much the exposure to extremes that's the problem but cycling to and from. So I would add that the coefficient of expansion works both ways and your assembly, not just solder will be close to 150C outside normal documented behaviour, just down this time not up. That's a big swing. Regards Mike ü Please consider the environment before printing this e-mail -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW Sent: Tuesday, February 22, 2011 11:29 AM To: [log in to unmask] Subject: Re: [TN] Low Temp Alloys Indium Corporation of America has experts on cryogenic alloys. Indium metal is supposed to be the most appropriate. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt Sent: Tuesday, February 22, 2011 6:17 AM To: [log in to unmask] Subject: [TN] Hillman and Pauls apparently live in such conditions. Hillman's the metals man, he'll have an answer? This could take a lot longer than the Friday Quiz. BTW - for those who still work in old numbers, that's -321.1F or -196.15C Graham N On 22 Feb 2011, at 10:35, Sylvain Kaufmann wrote: > Dear Technetters, > > I am looking for some information about solder joints / alloy behavior in extremely low temperature environment; in this particular case, for temperatures below 77K. > > I have not been very lucky so far and could not find any useful data or papers. > > Do any of you have experience with such environment? Any alloy to suggest or to stay away from? Some literature or studies that would be available somewhere? > > Thanks in advance for your help and sharing your thoughts about that cold case. > > Best regards > sylvain > > -------------------------------------------------------------------- > Sylvain Kaufmann > CERN / European Laboratory for Particle Physics > Rte de Meyrin > dpt. 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