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Mobile Surface Analyzer

MSA Flexible Liquid

Fast, automatic, and non-destructive wetting analysis with your liquids of choice

Mobile Surface Analyzer – MSA One-Click SFE for wettability analysis

In the Flexible Liquid configuration, the MSA Mobile Surface Analyzer carries out automated contact angle measurements between freely selectable liquids on solid samples. The focus lies on non-destructive analysis with formulations such as inks, coatings, or adhesives, to evaluate their wetting behavior in real process.


  • Analyzing the wetting behavior of formulations such as paints, coatings, or adhesives on solid materials

  • Checking wettability of plastics, glass, ceramics, wood, paper, or metal

  • Quality assurance of activation processes such as plasma treatment, flame treatment, or corona treatment

  • Testing the effectiveness of hydrophobic coatings and other coatings

  • Measurement on large workpieces and finished products such as car bodies, aircraft parts, or walls

Measuring methods

  • Contact angle of a drop on a solid surface

  • Surface free energy of a solid using contact angle data

  • Surface tension using the curvature of a perfectly symmetrical drop on a circular sample pedestal

  • Carrying out a measurement up to 20 consecutive times and displaying the results together

Measuring results

  • Static contact angle

  • Surface free energy (SFE) according to the following models: Owens-Wendt-Rabel-Kaelble (OWRK), Fowkes, Wu, Zisman, Equation of State

An automatic contact angle instrument in the palm of your hand

A quality camera, lighting, and a software-controlled dosing unit – everything necessary for reliable contact angle measurement is integrated in a light, hand-held device: the MSA Flexible Liquid. With its very small footprint, the instrument can be placed on large workpieces in any spatial orientation without the need to cut them to size. After quickly inserting and filling a cartridge, wetting behavior can be measured within seconds by just pressing a button.

Mobile Surface Analyzer – MSA Flexible Liquid for wettability measurements

Wetting analyses with almost any liquid

The MSA Flexible Liquid is ideal when you want to know the wetting behavior of a formulation with unknown surface tension rather than that of a standard test liquid. The measurement reveals how your actual liquid behaves on your solid. This helps to optimize paints, adhesives and other liquids, and also the surface properties of solid materials. Since disposable cartridges are used, contaminating or hardening liquids are no problem at all.

Software with versatile automation and evaluation options

The ADVANCE software for the instrument has versatile and intuitive options for automations which completely control the dosing process, the accurate and robust analysis of the drop image, and the evaluation down to an automated result export. This whole process can be started just by pressing the instrument's measurement button. When using two or more test liquids with known characteristics, ADVANCE also calculates the surface free energy of the material. Notably the determined polarity of the surface gives direct feedback to the effect of pretreatment methods such as plasma treatment.

Satisfied voices

We have been very impressed with the KRÜSS Mobile Surface Analyzer. It is user friendly, reliable and the software is excellent. It has provided us with ability to perform rapid measurements on a variety of surfaces.

Andrew Lee

Material Development Scientist, Crown Cork

The contact angle measuring instrument MSA is exactly tailored to our needs. The cooperation - especially the support during the learning phase - was excellent.

Hans-Christoph Thielemann

Product Engineer, Sika

We have extensively used the KRÜSS K100 Force Tensiometer and Mobile Surface Analyzer in a variety of projects and have found them to be invaluable instruments. The much-needed repeatability and precision of the instruments gives us high confidence in the data we produce.

Geoff Allen

Member of Research Staff, Xerox Research Centre of Canada