Determination of the surface tension
Test inks can be used to determine the surface energy / surface tension of solids made of plastics – metals – glass – ceramics.
The adhesion possibility of the surfaces in particular for printing, bonding and painting should also be determined based on the wetting pattern .
The surface tension is determined by applying a stroke of ink measuring just a few centimetres in length to the surfaces to be evaluated and observing the behaviour of the stroke of ink.
If the stroke contracts within 2 or 4 seconds – depending on the ink specification – the surface tension of the test area is lower than that of the test ink.
Conversely, if the stroke spreads, this would show that the surface tension of the applied ink is lower than that of the surface.
If the stroke remains unchanged during the observation period, the value of the surface tension has been reached exactly or is slightly higher.
Testing of a polyolefin film for 38mN/m
RAPIDTEST 38® serves to check if the treatment of polyolefins (polypropylene, polyethylene, polybutylene) has shown an effect onto the material. A stroke of the pen leaves a full line on thematerial if thematerial’s surface tension has a value of 38mN/m or more. The fluid applied to the surface will dry within seconds, it does not need to be wiped off anymore..
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More InformationApplication
In this application example, is tested with test ink PINK from 10 ml bottles with cotton swabs, cleaning is done with the arcotestCLEANER. Take a new cotton swab after each use.
Check metal surfaces for cleanliness.
In this application example, is tested with test ink PINK from 10 ml bottles with cotton swabs. Take a new cotton swab after each use.