I would say the best  guidance  for this could be found in the IPC documents for ESD and/or Moisture Sensitive Devices. 

Rich  Kraszewski 
Senior Staff Process Engineer
Plexus Engineering Solutions 


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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lyon Yuan
Sent: Wednesday, June 14, 2017 9:26 PM
To: [log in to unmask]
Subject: [TN] Temp and relative humidity



Dear All,


May I know which IPC define temp and relative humidity for General electrical workshop?


Lyon




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