Martin Spließ - best for PUR
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Test ink set for measuring surface tension Measuring range:

32 mN/m
34 mN/m
36 mN/m
38 mN/m
40 mN/m
42 mN/m
44 mN/m (millinewtons per metre)

Note: Please be aware I can not ship this product to outside of Germany. However, please feel free to contact me, so I can forward your request.

The set (7 bottles of 10 ml each) comes in a practical, lockable hard box including material safety data sheet.


Measure, don’t guess

Test inks based on formamide allow you to test the surface tension during series processing.

A brush for applying the liquid is integrated into each lid. Every material surface has a specific surface tension. Every liquid (e.g. adhesive) also has its own inherent tension. A secure, long-lasting, stable bond requires the surface tension of the material to be greater than that of the adhesive. Painted or laminated papers often have relatively low surface tensions (less than 34 mN/m). Gluing these papers requires surface tensions greater than 38 mN/m before adhesives can be used. For this kind of gluing, it is crucial for the adhesive and paper surface properties to be optimally compatible. That ensures the materials obtain optimal adhesion capability.

To be able to evaluate the surface modification optimally, the surface tension of the starting material first has to be determined. Furthermore, it must also be tested repeatedly during the ongoing processes for the sake of quality assurance. The important process for measuring surface tension is the test ink method (test inks), contact angle measurement (drop volume method) and dynamic measurement using a pocket goniometer (PG-X).

You can read more information in my newsletter"Lack & Kleber" (Paints & Glues)