Hey guys, im suppose to do a thermite reaction for chemistry at school.
Somehow, I doubt this. However, that being said, we don't allow posts of dangerous compositions on these forums. What you describe could be very dangerous. So, here's some safety tips:
1. Don't go looking for information on the internet. It's nothing but a shortcut and it's not reliable.
2. You asked in your post about Al particle size (before it was edited); it seems that you're looking for shortcuts, because you didn't read the second post in this thread carefully--particle size is mentioned. Take the time to do this right, and look it up someplace. The thermite reaction is so common that you can find an abundance of information on it if you just go to the library.
3. Go to a college chemistry library. Even if you have to ask the desk clerk there what you're looking for, you'll wind up with more reliable information than the internet.