A micron screen is a mesh sieve used in the manufacturing of bubble hash or dry sift hash. A micron is a measure of the aperture size on the screen, which is one-millionth of a meter or one micrometer.
The process of making hash is old, but with the use of modern technology, the ultimate goal has become to achieve the ideal trichome size, i.e. 65 microns. Whereas 90 and 73 microns give almost melted hash, 45 microns are considered to be close to complete melting but produce more robust smoke. However, the process and size vary with the type of cannabis.
Ultimately, particles need to be filtered through many different micron screen sizes to get the best trichome size and power possible.
“I use a 65-micron screen for manufacturing bubble hash.”