“What is the difference between cast and extruded acrylic?”
Generally, both types of acrylic are equally common in laser processing procedures, and both are very well suited. However, the advantages and disadvantages of cast (GS) and extruded (XT) can affect your work depending on the application.
Cast acrylic is available in many colours, and is produced at a higher thickness of 3-25mm. Laser engraving cast acrylic usually leaves you with a beautiful contrasted affect. The edge will be crystal clear, due to the laser beam polishing and sharpening as it goes.
Extruded acrylic, on the other hand, is only available in a few, limited colours, with a thickness of only 1.5-25mm (sheets) and 30µm-1mm (films). It is also cheaper than cast acrylic. The density of the material is much lower as well, enabling it to be laser cut a lot faster, and with less power. Laser engraving extruded acrylic does not produce the high contrast that cast acrylic does, and a sharp ridge occurs at the exit point of the laser beam during laser cutting.