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Calotest kaloMAX NT II device for the determination of wear coefficients and layer thicknesses

Methodology of abrasion testing by wear craters:
• Grinding-in the wear crater into the coating
• Determination of the diameter by microscope
• Calculation of the wear coefficient from normal force, sliding distance and volume of the wear crater

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Calotester kaloMAX NT II

Ball cratering test device for the determination of wear coefficients and layer thicknesses

Quality assurance of coatings needs expressive test procedures, which allow quick and reliable valuation of the coating quality.
The Calotest device kaloMAX NT II has been developed in co-operation with the Fraunhofer Institut for Surface Engineering and Thin Films (IST) especially for the charcterization of hard coatings. The method is usable for thin coatings (1 µm) as well as for the materials or lacquers. The procedure supplies a material charcteristic which enables a function-orientd evaluation of the coating quality.



Ball diameter Min. ø 15 mm, max.ø 30 mm
Speed range 20 – 500 1/min
Programmable Grinding path, grinding period, number of revolutions, dosage time etc.
Clamping range for plane parts 50 mm
Clamping range for round parts ø 3 – 30 mm (clamping jaws for other dimensions available upon request)
Cross table travel 25 x 25 mm
Dimension 305/295/295 (h/w/d)
Weight Approx. 8 kg
Compressed air supply Max. 6 bar



• Test takes only a few minutes
• Test parameters optimized for measuring hard coatings are available
• High reproducibility and accurancy by means of a special abrasive slurry
• High accuracy in grinding of the wear crater
• Usuable for plane and curved parts
• Exact determination of coating thickness without calibration even for multilayered coatings
• Easy positioning by cross table


Technical Specifications


  • Abrasive slurry with reference sample
  • Laser pointer
  • Gauge for adjusting the normal force on the sample
  • Microscopes (optionally with video camera to measure the diamter of the wear crater
  • Software for easy calculation of the wear coefficient