In the list below you will find several materials and their engraving indication parameters.
Be aware, these are indications only. Each lasertube and laser power supply are unique which means every machine is different. Do not take these values as truths, they should be looked at as guidelines.
If you use these indication parameters but the result you are getting isn't what you want, please try some different values. You could, for instance, engrave squares of 5*5cm with different values and choose which fits best.