Return to top Glass - glass, glass and more glass. Glass is a little more difficult material to engrave cleanly. The look of laser engraved glass is a little more subtle and not quite as bright as sandblasted glass. If high dpi and ppi settings are used, the glass gets hot and cracks. It is simply a matter of total heat put into the glass.
Heat is what causes the chipping or cracking.
Wet news paper - lay a single piece of newspaper over the glass and spray it with water. Use a squeegee to saturate the paper and remove water droplets. Puddles of water are bad. A flat, wet paper with no air bubbles is good. Water eats up excess heat and keeps the surrounding areas cool which reduces thermal expansion and chipping.