you see your std deviation goes up if purity drops and your cpk drift  
(yield may take hit)... especially when it is in the raining season.   
(1st hint will be your repair goes up after 1st pass yield goes  
down).  IMHO.
On Jan 10, 2018, at 6:36 PM, rkondner wrote:

> Hi,
>
> When we setup 2 selective Soldering machines the vendor strongly  
> recommended higher purity, 99.99 or better.
>
> Does anyone have experience with what level of purity is "Really"  
> required? What does a user see as the purity drops?
>
> Thanks,
> Bob K.
>
>
> On 1/10/2018 5:44 PM, Roger Mack wrote:
>> OnSite Gas Nitrogen generator