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How to know metal surface is oil free

(-----) 2006

Hi,
Can anybody tell me how do I know whether my metal part after pretreatment is really free from oil? any method to confirm? can suggest any titration method or chemical to check on this?

Thank You

KC Tan
ced system - Malaysia
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2006

The "waterbreak test" is very simple and has long been used. If after dipping the part in water, the water remains on the as a continuous sheet, it's a good indication of cleanliness. If it beads up at all,in the manner of water on a newly waxed car, it's not clean.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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2006

You can use a solvent like Acetone [affil. link to info/product on Amazon] as a swab to 'clean' half of the part. If you see a difference between the pre-treated area and the acetone cleaned area then you know the part is not cleaned efficiently.
Water break tests often fail as I have seen parts coming out of.

John Neale
- Halesowen, West Midlands, UK
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2006

Waterbreak test is widely used to detect any presence of hydrophobic (nonwetting) films and the presence of hydrophobic organic materials in processing ambients.

ASTM F22 [affil. link to spec at Techstreet] is a standard test method for hydrophobic surface films by the waterbreak test.

David Shiu
- Singapore
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2006

The water break test that the common method to test the surface of steel after treatment stages by notice the motion of water in the surface of steel from up to down if it is go in stable direction without any round area so there is no any oils in you steel surface.

Ali Gomaa
- Cairo, Egypt
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