Piedrujas street 11, ofiss 214, Riga, Latvia, LV-1073
Mon.-Fri. 9.00-18.00, Sat.-Sun. closed

Calotester kaloMAX NT II S3 – ball crater test

For quality assurance and coating development

  • Layer thicknesses – Approx. 0.3 – 30 μm
  • Diameter of the spherical cap — Approx. 0.1 – 2 mm
  • Measurement accuracy – 1 – 5 % (dependent on surface roughness)
Ask Question


kaloMAX NT II S3

The ball crater test (Calotest) is a well established method for the determination
of layer thickness. With a rotating steel ball and an abrasive slurry, a spherical cap is ground
through the coating into the base material of the sample. When examined with a microscope,
the layer/base material interface appears as a circle or, in case of a multilayer coating, a system
of concentric circles. The layer thickness can be calculated from the diameters of these circles and
the diameter of the grinding ball. This purely geometrical method gives highly accurate results even
for layer thicknesses in the range of micrometers. Evaluation and documentation can be further simplified
By the software kaloSOFT and a camera-equipped microscope.


Technical Specifications

Technical Specifications
Ball diameter – 15 – 30 mm
Clamping range for plane samples – 50 mm
Clamping range for round samples – 3 – 30 mm (clamping jaw for other dimensions on request)
Cross table travel – 25 x 25 mm
Incline of sample level – 60 degrees
Revolution speed – 30-1000 1/min
Running periods — arbitrary
Input voltage range – 85 – 264 VAC
Input frequency range – 47 – 63 Hz
Dimensions – 300 x 295 x 235 mm (w / d / h)
Weight – Approx. 8 kg