Peter:
        This has been the humidity threshold people go by wherever I have
worked at.. I do not know where the 30% came from. If it came from studies
or just years of experience.
        Regards,
        Ramon

> -----Original Message-----
> From: David Douthit [SMTP:[log in to unmask]]
> Sent: Wednesday, February 04, 2004 7:06 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Facility Humidity control
>
> Peter,
>
> The general rule of thumb is to maintain rH between 30% and 50%.
>
> Below 30% there are ESD issues. Above 50% there are
> contamination/corrosion issues.
>
> David A. Douthit
> Manager
> LoCan LLC
>
> Peter L. wrote:
>
> >Technet,
> >
> >What is the typical humidity/ temperture (nominal and +/-) for a CEM
> >production environment?
> >
> >Is there an industry "acceptable" range?
> >
> >We are located here in the west coast and have seen relative humidity
level
> >varied from low 30s% (winter) to high 60s in the summer. Under what
> >conditions should a HVAC control system be introduced and without that,
> >what would be the potential impact on the overall manufacturing process?
> >
> >
> >Rgds,
> >Peter
> >
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