All of them except for PVC, that generates toxic fumes that are dangerous for both the environment and people.
Possible workings include surface and deep marking, cutting, openwork.
Yes, it can but considering the easy reactivity of the material to heat, in order to achieve good quality effects, the marking speed should be high and the power should be low and accordingly the marking depth is limited.
The colour effect is that of burning, according to the kind of plastic.
In case of plastic marking, the recommended machine model is chosen according to the working area and the resolution required.