The two samples are placed together. A long strip sample is fixed on the flat surface and another squared sample is applied force by a sled. The friction force is measured when they slip against each other.
Coefficient of Friction Testing Equipment Features

1.       PLC control and touch screen operation

2.       Real time display of test data, results and curves

3.       Both the static and kinetic coefficient of friction can be measured

4.       In accordance with multiple international standards

5.       Test results calculation, analysis and curve superposition

6.       RS232 output and professional software

7.       Microprint of easy printing of test result
Load Cell 5N
Accuracy 0.5 F.S.
Stroke Max 150mm
Sled 200 g (Customization for other weight)
Test Speed 100mm/min (ISO), 150mm/min(ASTM)
Power AC 220V 50Hz ( can be changed to local requirement)
Dimensions 540mm(L)*380mm(W)*240mm(H)

Standards 
ASTM D1894, ISO 8295, TAPPI T816, GB 10006