Hi, Paolo,
For your questions,
1) Yes.
2) Yes.
3) Yes. (see link:http://www.ahlborn-kunststoffe.at/gehrfile/chpmmae.htm)
About PMMA, please see link:
http://en.wikipedia.org/wiki/Acrylic_glass

Good luck.

On 1/10/07, paolo bondavalli  wrote:
> Dear members,
> I need some information abour PMMA.
> Is it used for photo-lithography?
> Is it photo-sensitive?
> Is it resistant to ethanol?