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Drop Shape Analyzer


From one-click wettability measurement to analysis of solid-liquid adhesion

Drop Shape Analyzer – DSA25E for wettability measurement and adhesion

In its Expert configuration, the DSA25 Drop Shape Analyzer is designed for determining the wettability of solids by means of the contact angle as well as the surface tension of liquids such as coating substances or adhesives. Thanks to the combination of speed and versatile evaluation options, the analyses give quick feedback to pretreatment steps in quality control but also allow assessing the resulting adhesion.


  • 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

  • Analyzing coating liquids and adhesives and assessing their adhesion

  • Assessing long-term stability of coatings

  • Analyzing (super-) hydrophobic and self-cleaning surfaces

  • Wetting analysis at controlled temperature and/or humidity

Measuring methods

  • Contact angle of a drop on a solid surface

  • Contact angles of two drops dosed in parallel

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

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

  • Surface free energy of a solid using contact angle data

  • Surface or interfacial tension using the curvature of a drop or bubble at the tip of a needle

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

  • Calculating adhesion-related scientific parameters for the interfacial contact

  • Calculating the polar and disperse part of the surface tension from contact angle and surface tension data

  • 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

  • Roll-off angle

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

  • Surface tension of a liquid and interfacial tension between two liquids

  • Work of adhesion, solid/liquid interfacial tension, spreading coefficient

  • Temperature

Liquid Needle dosing

Surface free energy in seconds

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

Quick and versatile dosing for surface free energy and surface tension

The interaction between two software-controlled dosing units is the main advantage of the DSA25E. The Liquid Needle dosing technology performs rapid one-click measurements of the surface free energy (SFE) based on contact angles of two liquids. The additional syringe dosing unit can be used to add data for a third liquid to consolidate the SFE result or to measure the surface tension (SFT) of a liquid.

Drop Shape Analyzer – DSA25E for wettability measurement and adhesion
The Liquid Needle doses two drops, which are analyzed in parellel.
Drop Shape Analyzer – DSA25E for wettability measurement and adhesion
Just one drop of liquid is sufficient to precisly measure the surface tension.
Reliable drop shape analysis thanks to high imaging quality

The DSA25E 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 or SFT. Combined with the intelligent image evaluation algorithm of the ADVANCE software, drop shape analysis with the instrument provides exact results.



Maximum repeatability and comprehensive adhesion analysis

The ADVANCE software supports the Liquid Needle in order to carry out automated SFE measurements within a second. The easy-to-create automation programs can also be used to design a standard procedure for sample analysis to maximize repeatability of measurements. Optional software tools for data analysis combine SFE and SFT data in order to assess the adhesion and calculate other scientific parameters of the solid/liquid contact.


Drop Shape Analyzer – DSA25E for wettability measurement and adhesion

Tilting TaBLE

Characterize low wettability

The tilting table for the DSA25: Analyze (super-) hydrophobic and self-cleaning surfaces automatically by means of the contact angle and roll-off angle.


  • 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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