Contaminants And Wiping Theory-Contaminant removal methods

Contaminants And Wiping Theory-Contaminant removal methods

l Cleanroom contaminants

l Sources of contamination

l Particle adhesion mechanisms

l Contaminant removal methods

l Considerations for contaminant removal

l Choosing the right tools and methods

l Myesde Cleanroom Wipes

Contaminant removal methods

An effective cleaning method must remove as much of the unwanted contaminants as possible.

An effective cleaning method

should also be as consistent

and repeatable as possible.

Though there are many specialized methods for cleaning specific tools and equipment, the most common methods used for general cleaning are:

l  Air blow-off  

v Generally used in clean areas, not certified controlled environments

v Effective in removing large particles

v Does not prevent redeposition of contaminants

v Does not effectively remove small particles

v Does not remove residues

l  Vacuum   

v Generally used for gross cleaning

v Effective in removing large particles

v Effective on small particles only if equipped with brush attachment

v Prevents redeposition of contaminants

v Does not remove residues

l  Tack roller   

v Generally used for gross cleaning

v Somewhat effective in removing large particles

v Does not effectively remove small particles

v May not prevent redeposition of contaminants

v Does not remove residues

l  Dry wiping   

v Does not effectively remove small particles

v Can remove some residues

v May not prevent redeposition of contaminants

v Sometimes used for drying after wet wiping

l  Wet wiping/mopping  

v tension reduces capillary forces

v Very effective in removing large particles

v Very effective in removing small particles

v Effective in removing residues

v Does prevent redeposition of contaminants if properly saturated

Conclusion

Wet wiping and mopping is the most effective method for removing particle and residue contaminants, and preventing their redeposition

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