People often think of contamination as particles, dust, dirt or some type of chemical residue. Lighthouse looks at contamination per the Institute of Environmental Sciences and Technology (IEST) definition: “Any foreign material or energy that has a detrimental effect on product or process.”
Examples could be:
- Air or liquid borne particles
- Gas phase or airborne molecular contamination
- Electrostatic charge or electrostatic discharge
- Electromagnetic interference
- Fluctuations of cleanroom or minienvironment differential pressure
- Fluctuations of cleanroom temperature & relative humidity
- Vibration
- Surface particles
- Air changes



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