It is more than solder paste, ESD, moisture sensitive components, board
storage, placmement equipment, cleaning chemistries all see RH as a
variable. J-STD-001 requires the manufacturer to verify that ESD
controls are adequate with RH drops below 30%.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of WEEKES,
> MICHAEL HS-SNS
> Sent: Thursday, October 03, 2002 9:55 AM
> To: [log in to unmask]
> Subject: Re: [TN] Temp Humidity Control - Do you?
>
>
> recommend 65 F to 75 F for temp and 30 to 50% RH - depending
> on your location, climate, size of shop this may be very
> expensive.  It is common to rise above 50% rh in the Midwest
> in summer and below 30% rh in winter.  I'd find robust solder
> paste which can handle out-of-range values before I'd shut a
> line down.
>
> Mike
>
> -----Original Message-----
> From: Henry Rekers [mailto:[log in to unmask]]
> Sent: Wednesday, October 02, 2002 2:24 PM
> To: [log in to unmask]
> Subject: [TN] Temp Humidity Control - Do you?
>
>
> How many of you out there are in full control of your
> temperature and humidity in your SMT facility?
>
> Do you track it?
>
> How tight do you control temperature?
>
> What do you use to control humidity?
>
> Any info would greatly help.  We are uncovering some very
> interesting challenges as we move towards 24-7 and I just
> want to find out what others are doing.
>
> Thanks.
>
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