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Your recommendation is appreciated - Humidity Range for the SMT

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Theresa Spear

#44905

Your recommendation is appreciated - Humidity Range for the SMT | 6 November, 2006

We are starting up a new clean room for SMT production and wondering if anyone is aware of any guideline for operating humidity and temperature ranges for the room. We know that the MSD's will prefer it to be dry and cool. However, there are other factors to be considered, such as solder paste, anti-static, reflow oven, wave oven, human comfort ...etc.

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#44919

Your recommendation is appreciated - Humidity Range for the SMT | 6 November, 2006

Why a clean room? Or do you mean an environmental room to control temp and RH?

Any way, to answer you question, your wave and oven can care less about RH. Just don't keep them at 100% RH.

Static can easily be handled with lower RH and proper grounding techniques.

Solder pastes should be able to handle anything that makes those human things comfortable. Follow any lead your paste manufacturer may offer. Then perform a DOE on paste stencil and PCB life. Document your results and set your times accordingly.

Over all I would think anything in the 30 to 40 percent range would be just fine.

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#44923

Your recommendation is appreciated - Humidity Range for the SMT | 7 November, 2006

We use J-STD-001, a widely accepted consensus document, control limits of 18-30*C, 30-70%RH. Search the fine SMTnet Archives for background.

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