7.3 Climate Control (HVAC)

7.3 Climate Control (HVAC)

• The Humidity Window: Strict maintenance of 40-60% RH.
  • Too Dry (<30%): ESD risk explodes.
  • Too Wet (>60%): Moisture Sensitive Devices (MSD) absorb water, leading to "popcorning" in the reflow oven.
• Temperature Stability: Maintaining 22°C ±3°C. Large swings affect solder paste viscosity and machine calibration.