[TowerTalk] 31 mix variability ... lost processes

[Roger (K8RI) on TT]

One company I worked for, increased the purity for one of their 
products.  The immediately received complaints from a major customer. It 
seem as if that customer depended on the characteristics of one trace 
impurity.

73

Roger (K8RI)


On 7/9/2016 Saturday 3:30 PM, jimlux wrote:
> On 7/9/16 12:09 PM, David Gilbert wrote:
>>
>> It doesn't even have to be the fault of the receiving entity, whether
>> that be a new location or new owners.  I worked in the semiconductor
>> industry for over 30 years and saw several examples of "lost recipes"
>> simply because the original process was never properly investigated,
>> characterized, and documented in the first place.  Processes that had
>> produced excellent product for years might suddenly shift because some
>> influence that had never been understood at all changed.
>>
>> We actually had one product that shifted dramatically for the worse
>> because a piece of equipment was upgraded to a cleaner version, and it
>> took a lot of engineering work to understand the favorable impact that
>> the carrier lifetime killing effect from the older, dirtier equipment
>> had on the product.
>>
>
>
> You hear a lot of stories about trace contaminants making electron gun 
> cathodes "work" or not.  Someone gives up smoking, and all of a 
> sudden, things don't work the same as they used to.
>
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-- 

73

Roger (K8RI)


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