FEPA F and FEPA P are two different grading systems for abrasive grains used in coated abrasives, such as sandpaper and grinding wheels. These grading systems were established by the Federation of European Producers of Abrasives (FEPA), an organization that sets technical standards for abrasive products in Europe. The main difference between FEPA F and FEPA P lies in the application for which the abrasive grains are used.

FEPA F

This grading system is used for abrasive grains specifically intended for use in bonded abrasives, such as grinding wheels and cutting-off wheels. These grains are typically made from materials like aluminum oxide, silicon carbide, and other synthetic abrasives. The FEPA F system assigns grit sizes based on the average diameter of the abrasive grains, which are measured in micrometers. The grit sizes range from F4 (the coarsest) to F1200 (the finest).

FEPA P

This grading system is used for abrasive grains designed for use in coated abrasives, such as sandpaper and abrasive cloth. Similar to the FEPA F system, the FEPA P system also uses grit sizes based on the average diameter of the abrasive grains. However, the grit sizes in the FEPA P system range from P12 (the coarsest) to P2500 (the finest).

Both FEPA F and FEPA P systems follow a similar principle in assigning grit sizes, but the specific grit sizes and application areas differ. It is essential to choose the correct abrasive grain size and type according to the intended application to ensure optimal performance and surface finish.