Humidity requirement for soldering

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engr_joni_ee

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I was looking in one soldering standard that says "The relative humidity at room temperature of the facility shall be maintained at 55 % ± 15 %." What does it means 40 % to 70 % ? or ± 15 % of 55 ?
 

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Hi,

it means 40 % to 70 %

Btw: I don´t think the humidity is necessary for the soldering process. I rather guess you needs some minimum humidity to keep ESD problems low.

Klaus
 

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The humidity at the soldering place may not be highly relevant; but the humidity within the solder paste is very important as becomes steam and explodes.
 

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joniengr said:
humidifier, is that a device ? can we use that in the clean room environment ?
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Hi,

yes, humidifier is widely used in clean room for getting a higher humidity level when the RH is lower than spec .
It is also can be found in many PCB production house either .

BR
 
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