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The wetting behaviour of an oil drop on a surface is directly function of the degree of cleanliness, more specifically depending of non visible film of adsorbed species on the surface, which may be existing even after a cleaning treatment.
In such a situation, there is a strong interest in developping a method allowing to detect the presence of such films. Using oil droplets to assess the state of a surface is nothing easy, mainly because of the polar characteristics of oil ingredients, leading to the developement of adsorbed species onto a cleaned surface.
By using non-polar, non volatile liquids, the development of adsorbed film is avoided. The droplet shape is directly dependent of both the liquid and solid surface tensions. By using a set of various liquids having variable surface tension, it is then possible to define the surface tension of the solid being tested.
The Laboratoire Dubois SA is proposing a testing kit, allowing the control of the degree of cleanliness of surfaces after a cleaning treatment. The JPR kit is providing a set of 6 bottles, each filled with a liquid of a different surface tension, together with the required accessories to perform the check.
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