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Drop Shape Analyzer


Semi-automatic wettability analysis with high dosing precision

Drop Shape Analyzer – DSA25S for wettability measurements

The Standard version of the DSA25 Drop Shape Analyzer measures the static or dynamic contact angle with high precision and can also be used to determine the surface free energy by carrying out measurements with several liquids. The instrument provides rapid results for the wettability of a surface, for example for checking the quality of cleaned, pretreated, or coated samples.


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

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

  • Testing the effectiveness of hydrophobic coatings and other coatings

  • Wetting analysis at controlled temperature

Measuring methods

  • Contact angle of a drop on a solid surface

  • Contact angle using a gas bubble beneath a solid surface in a liquid

  • 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

  • Roll-off behavior and advancing/receding contact angle of a drop on a tilted surface

  • Contact angle at an immersed, cylindrical sample, usually a fiber

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

Measuring results

  • Static contact angle

  • Advancing and receding contact angle

  • Contact angle using a bubble in a liquid

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

  • Temperature

Controlled drop dosing for static and dynamic contact angles

With the DSA25S, dosing is carried out under software control to ensure repeatable conditions and user-independent results, which is vital for quality control. Precise measurements of the advancing and receding angle run smoothly thanks to the adjustable dosing dynamics. This measuring mode leads to a statistically significant mean value for the measured sample position.



Reliable drop shape analysis thanks to high imaging quality

The DSA25S features a high-resolution camera and a quality zoom lens for accurate display of the drop with optimum size. The high image quality that this achieves leads to a precisely measured contact angle. Combined with the intelligent image evaluation algorithm of the ADVANCE software, drop shape analysis with the instrument provides exact results.



Software procedures for accurate time control

The ADVANCE software can automatically start the measurement process immediately after dosing, thus enabling raw data to be recorded without losing any time. This is particularely important for samples that show a time-dependent wetting behavior.


Liquid Needle dosing

Surface free energy in seconds

With the Liquid Needle, the contact angle measurement technology is perfectly prepared for quality assurance as well as R&D. Learn more about the ideas that enable the Liquid Needle to combine speed with scientific excellence.


  • Intuitive software with a workflow-oriented user interface

  • Swift and repeatable analyses thanks to measurement templates and powerful automation functions

  • Superior algorithms for image analyses provide for precise results even with difficult images

  • A wide range of evaluation methods makes ADVANCE a reliable scientific tool

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