With 3M micron-graded abrasives you remove a controlled amount of material leaving a more consistent finish after each grade of abrasive. Use Imperial™ microfinishing film wet or dry on most any surface area. The tough yet flexible film backing on these 8-1/2" x 11" sheets provides greater durability for more consistent finishing results.
There are many ways to measure the individual particles that are embedded in abrasives. And because manufacturers differ slightly in their measuring systems, and particle shapes vary so much, it's nearly impossible to offer a standard comparison between grit sizes and micron sizes. There are, however, some good estimations that will help you determine which abrasive to use. NOTE: This table is an approximation and is for comparison only; measurements will vary from one manufacturer to another.