Yes the good bags are 25 -220 microns and you can get silk screens that are 305 lines an inch, but I am not sure how many microns that is because I am not sure how big the lines are. If the lines are as big as the gaps they would still be .0016 or 1600 microns.

I know that I have made poor mans keif with just a blender and a gold reusable coffee filter, and hell it got me pretty high. I plan on making some pills with it so it does matter to me if it is graded keif.

I was looking to get one of these and try it for only $25.
Aluminum 20x24" 305 Yellow Mesh