Finishes like stain or paint as well as adhesives in the manufacturing industry are often called out in mils or thousandths of an inch. We use something called

Finishes like stain or paint as well as adhesives in the manufacturing industry are often called out in mils or thousandths of an inch. We use something called a thin film test to ensure paint is the correct thickness so that really tight tolerances can be maintained. We also using tiny glass beads of a consistent diameter that are mixed in with certain types of adhesives to create a controlled bondline thickness. We have a part that requires a really tightly controlled thermal interface to a circuit board. The solution is to use a specific amount of epoxy mixed with a specific amount of boron nitride powder and a specific amount of glass beads to have a consistent thermal conductivity for every squirt of the glue.