Here is the common PCB capability sheet of BokTech's PCB fabrication. You could contact us for special PCB requirements, we also do the custom specification.
PCB Manufacturing Process
Printed circuit board processing and assembly are done in an extremely clean environment where the air and components can be kept free of contamination.
How To Create a Gerber File Using Eagle
Here is the guideline to create the files you need for a 2-layer and 4-layer board using Eagle. You will have all the necessary files needed to send to most PCB manufacturers.
Aluminum PCB - basic material parameters
Aluminum PCBs is the most common type of Metal core PCBs. Currently, Aluminum Backed PCBs is regarded as the solution to high power and tight tolerance applications.