Paint & Inks are usually characterized in very empirical ways, with operator-dependent tests. Another possibility is to use very advanced technologies, but without respecting realistic conditions (thickness, substrate, pre-coating, etc...).
Rheolaser COATING enables to measure any paint or ink on its designed substrate, in realistic conditions (precise thickness), with no influence from the operator!

  • Architectural or specialty paints ;
  • Gravure inks, paper inks, e-inks, etc... ;
  • Monitor effect of a thickener or an additive ;
  • Control the open-time ;
  • Monitor dust-free time, touch-free time, dry-hard time, etc... ;
  • Characterize the tackiness of a coating at the end of the drying ;


Cosmetic products can be characterized during their drying as soon as they are applied as a thin coating. It happens in many end-use of the products, such as:

  • Drying of nail varnishes ;
  • Evolution of a mascara when taken out of the bottle ;
  • Transfer-free formulation of foundations ;
  • Glossiness of a lipstick ;
  • Benchmarking of any cosmetics product ;


All kind of resins, binders, or materials can dry or cure versus time (or depending on UV light or any other external conditions). These samples can also be studied with the Rheolaser COATING, as it enables to work directly on the product, in realistic conditions (substrate and specific thickness).

  • UV-curing of specialty products (effect of UV power, duration, etc...) ;
  • Control the curing of 2 component polymer systems (2K adhesives) ;
  • Breaking and drying of bitumen emulsions ;
  • Special coatings for aeronautical applications ;
  • Influence of a pre-layer of coating on the drying ;


Coatings drying

The very first commercial instrument based on MS-DWS technology, Rheolaser COATING, enables monitoring of microstructure changes during the film formation process. It identifies the drying mechanisms and characteristic drying times on any kind of substrate and any thickness. It works on any kind of film-forming products or coatings, such as inks, paints, varnishes, resins, binders, cosmetic films...

Key benefits

  • Contact-free method
  • Microstructure analysis
  • Open environment: measurement on any kind of substrate, at any thickness

How does it work ?

To quantify the deformation speed of the speckle pattern and plot the speckle rate as a function of time, successive speckle images are acquired over time using a video camera.

The speckle images are then processed to determine the decorrelation time τ corresponding to a relevant speckle pattern deformation. The speckle rate is obtained as the inverse of time τ, and one point is plotted on the kinetics.

As the film progressively forms, the scatterers motion decreases and so does the deformation speed of speckle pattern. The acquisition time is continuously optimized to achieve the best measurement at high and low speckle rates, i.e. to ensure accuracy and responsiveness.

Data and key features

> Fluidity Factor

Thanks to the unique and patented A.S.I.I (Adaptive Speckle Image Interferometry) processing, evolution of the “Fluidity Factor” versus time is displayed in real time providing a wide range of information such as:

  • Optical film formation analyser
  • Drying times (open time, touch-dry time, dry-hard time, ...)
  • Curing times
  • Microstructure change (particle packing, particle deformation, curing...)

> Characteristic times

Rheolaser COATING gives access to any characteristic time of the drying/curing process:

  • Open-time
  • Dust-free
  • Set-to-touch
  • Dry through

> A versatile device

Rheolaser COATING has been designed as an open configuration to run experiments with automatic coater and/or vacuum bed. It works with any sample thickness, records temperature and humidity at all time and works on any kind of substrate: metal, glass, plastic, wood, concrete, paper, and others... 

Discover our Range

  • > Rheolaser Coating


    Determine accurately the drying or curing times and mechanisms of any coating or film-forming product, without any contact. 

    Light source 650 nm or 850 nm
    Detection MS-DWS
    Cell Volume N/A
    Simultaneous measurements 1 to 4
    Temperature range
    l* measurement No