Sliding is the same act, but what has to be measured differs between a hard
coating and a soft material. For hard coatings, the measures are the
friction coefficient and the strength that holds the interface until
repeated sliding delaminates it. For soft matter, the deformation itself
governs the response, so the rate and amplitude of deformation matter as
well; the range runs from adhesive sheets and gels to resin films and cell
layers. The OST3000 sliding peel strength tester observes delamination
automatically and records the residual groove depth. The FPR2200 friction
player runs dead-weight friction and wear tests under controlled temperature
and humidity, in liquid, under heating, and with four-terminal resistance
measurement. The RTT1000 rheo-tribo tester shears a soft material in plane,
as used and without a stacked specimen, and measures its viscoelasticity and
the strain at which slip sets in. The talk shows measured examples from all
three and how to choose among them.