Rich

IMHO, there are two contradictory requirements for humidity. Where you
are stencilling solder paste and any hold areas thereafter, up to
reflow, you want the humidity as low as possible, say 30% RH at 22°C.
For all other areas, for ESD reasons, you want the humidity relatively
high. Many of the so-called anti-static materials start to kick in only
above 50% RH at 25°C, because they rely on absorption of humidity to
create a poorly conductive leakage path. This includes many flooring
materials, plastic handling devices, "pink bags", anti-static sprays
etc.

Brian

Rich Lasko wrote:
>
> Good morning everyone!
>
> Can anyone tell me if there is an industry standard for temperature and
> humidity levels for an electronics production floor? I believe the
> recommended minimum relative humidity level under a good ESD program is 40%.
> We are looking to monitor the temperature and humidity levels in our new
> building but I am unsure of what the upper and lower acceptable limits
> should be.  Please advise.
>
> (Please note: as of now we are looking to treat the entire production floor
> as a controlled environment, however in the new building the shipping doors
> are only blocked by those "shipping drapes" which means when they are open
> the outside temperature could play a role in changing the inside
> temperature.)
>
> Rich
>
> ---------------------------------------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
> ---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------