Methods for Determining Cleanliness

Water-Break Test:

Water will sheet off the part rather than bead

• Take a cleaned and dried part and set it in a vertical position.
• Use a spray bottle containing distilled water.
• Spray the part two to three times from at least 6" away.
• If the part is clean and free of oily residue, the water spray should sheet off.
• If some oily residue remains, the water will tend to bead on the part

UV Blacklight:

Can you see fluorescence on the parts when viewed using a blacklight?

• Take the cleaned and dried part and the blacklight into a dark area.
• In the dark area, shine the blacklight onto the part.
• If the part is free of soils, it should not highlight any fluorescence
• If some soil remains, you should see some florescence where the soil is present.
• You should check a dirty part for florescence to ensure that the soil emits a florescence when viewed under a blacklight.

Clean-wipe test:

Will a white cloth remain white after being rubbed on the cleaned part?

• Take the cleaned and dried part and wipe it with a portion of a clean, white, lint-free cloth.
• If the cloth remains clean, the part is sufficiently clean.
• If the cloth becomes soiled or discolored, the part still contains soil residue.

Gravimetric testing:

Will tell how much contaminate is left on the part

• Involves filtering a contaminated sample through a control filter and a sample filter.
• Place two pre weighed filters, one on top of the other in a single filter holder.
• Sample contaminants will be retained entirely by the top test filter.
• Both filters are subjected to identical alterations in tare weight as a result of moisture.
• Any change in weight of the bottom ("control") filter is then applied as a correction to the weight of contaminant.
• Results accurate to 0.1 mg are routinely attained using this method.

Methods for Determining Cleanliness

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