  When particles of a few tens of microns are spread on the surface of water,
they aggregate under the action of capillary forces and form a thin floating
membrane, a particle raft. In a tank with a raft made of graphite powder, we
generate in the laboratory gravity surface waves, whose wavelength {about 17
cm} is very large compared to the thickness of the raft {of order 10 microns}.
For a sufficiently strong wave amplitude, the raft breaks up progressively by
developing cracks and producing fragments whose sizes decrease on a time scale
long compared to the period of the wave. We characterize the breaking
mechanisms. Then, we investigate the area distribution of the fragments
produced during the fragmentation process. The visual appearance of the
fragments distributed in size and surrounded by open water bears a {notable}
resemblance to the floes produced by the fracturing of sea ice by waves in the
polar oceans. Fragmentation concepts and morphological tools built for sea ice
floes can be applied to our macroscopic analog, on which the entire dynamic
evolution is accessible. {However, the mechanic of the two systems differ, as
our particle raft breaks due to the viscous stresses, whereas the sea-ice
fractures due its bending by the waves.
