thx.  the image a bit different than the glass cracking seal i used  
to see.... may be my old eyes problem.
            jk
On Mar 13, 2015, at 6:01 PM, Watson, Howard August wrote:

> Joyce,
> John answered the question about seal material. Not sure about your  
> other questions, but I do see matching chips on the two lids which  
> could indicate a severe collision. I don't like the lid alignment  
> problem either, which appears to be a contributor. Thanks for your  
> help!
>
> Howard A. Watson
>
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Friday, March 13, 2015 10:29 AM
> To: TechNet E-Mail Forum; Watson, Howard August
> Subject: Re: [TN] Mechanical failure of 8-pin Cerdip
>
> what is the seal material?  the substrate surface finishing?  
> (especially the lid surface finishing).  If you use polymeric  
> material as a seal, your fine leak test doesn't mean anything - He  
> got absorbed in the polymer...
> is it glass or metal seal?  what kind?  please don't drop a  
> satellite on my head on Fri the 13.
>                    jk
>> Drew,
>>
>> Thanks for the feedback, and it is good to hear that someone has seen
>> this defect before with a cerdip. I was wondering if this type of
>> problem might be more prevalent with the cerdips.
>>
>> Howard A. Watson
>>
>>
>> -----Original Message-----
>> From: [log in to unmask] [mailto:[log in to unmask]]
>> Sent: Friday, March 13, 2015 8:57 AM
>> To: [log in to unmask]; Watson, Howard August
>> Cc: [log in to unmask]
>> Subject: RE: Mechanical failure of 8-pin Cerdip
>>
>> Howard,
>>
>> Not common but it does happen.  I have witnessed this once.  When I
>> was working at Fisher Controls International.  This was in the pre  
>> ICT days.
>> Each assembly type had a custom made test box designed and built  
>> for it.
>> One of the test department folks called us out to see this.  He  
>> had  a
>> completed assembly on the test box.  The assembly was fully
>> functional, passed all set up and test process.  When he had finished
>> test he noticed a fourteen pin Cerdip missing it's lid.  Electrically
>> sound.  We joked about shipping it that way but of course off to
>> repair it went.  Cerdips can fail at the glue line if impacted  
>> hard or
>> if the bond was compromised in some fashion when it was made.  As  
>> long
>> as it is very rare all you can do is scrap the bad part or tube of
>> parts if your uncomfortable with the risk on the balance of parts  
>> in the tube.
>>
>> Drew Meyer
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Watson, Howard
>> August
>> Sent: Friday, March 13, 2015 9:36 AM
>> To: [log in to unmask]
>> Subject: [TN] Mechanical failure of 8-pin Cerdip
>>
>> Hello TechNet,
>>
>> I have an IC Op Amp that was found in stock with the lid separated.
>> The stock room discovered this while kitting components, so this part
>> was minimally handled. It was stored in the original IC tube.
>> Collectively, we have never seen an occurrence of something like  
>> this,
>> and I wonder if any of you have experienced this before. The
>> explanation I got from the manufacturer is that it is most likely a
>> packing and/or handling problem and that if there is too much  
>> slack in
>> the tubes, the parts colliding together could cause the lid to pop
>> off. Wouldn't the seal material be more robust than to allow the lid
>> to pop off? My concern is that we have
>> 120 of these all from one lot, and if there was a processing problem,
>> then maybe I have some other poorly bonded lids that may separate. Do
>> you think my concern is valid, or is this a one-off rare handling  
>> caused defect?
>> These are space grade parts.
>>
>> Thanks to Steve, a couple pictures are posted on the links below. I
>> don't know what could be determined from the first picture, other  
>> than
>> yes, the lid definitely popped off! The second picture shows another
>> IC with a lid slightly skewed, but within tolerance I believe. Thanks
>> in advance for any suggestions you can offer.
>>
>> http://stevezeva.homestead.com/RH1078MJ8-1.jpg
>> http://stevezeva.homestead.com/RH1078MJ8-2.jpg
>>
>> Howard A. Watson
>>
>>
>> _____________________________________________________________________ 
>> _
>> 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] 
______________________________________________________________________