Vulcanized fiber, also known as fishpaper, is a laminated material composed of cellulose. It is a robust electrical insulating presspaper with extremely high tensile, tear, burst, and dielectric properties. Laser processing of vulcanized fiber can be performed with either a 10.6 or 9.3 micron CO₂ laser. Laser cutting of fish paper with a CO₂ laser produces a clean cut with minimal discoloration. Laser marking of fish paper with a CO₂ laser will produce an indelible surface mark with no depth which can be either lighter or darker depending upon the material processed. Laser engraving of vulcanized fiber will produce both depth and contrast, depending upon the material processed and is limited to the material thickness.