The thicker the material to be cut, the more crucial a high laser power is in order to achieve a good quality. As a rule of thumb, the following applies for acrylic, for example: 10 watts per millimeter.
A comparison of the cutting time for different sheet thicknesses of acrylic between 200 and 400 watts is shown in the graphic.
In addition to acrylic, other plastics are also processed by laser, e.g. polycarbonate or SAN. These require high powers of 200 or 400 watts in order to be able to cut them cleanly even with a comparatively low thickness of 2 and 3 mm.