Aluminium cans? Frankly I don't know, I haven't tried. Might be hard because of the high reflectivity in metal, the light won't "stick" and heat properly.
Might mention it's highly not recommended to shine a high powered laser into something that reflects. If these are the burning kind of lasers it could serious hurt your eyes or others.
What have you tested the with or tested it to do?
Oh yes that's definitely true. When burning one should always be wearing safety goggles anyway.
The most powerful models can burn through most thin material except very resistant stuff like metal or stone. For example paper, cardboard, plastic, rubber, textile, wood etc. There are plenty of laser burning videos on youtube, where people demonstrate what laser of different power ranges can do.
will they come trough duty in germany?
Yes, I've had plenty of customers from Germany without problems.
