When properly fitted, use with appropriate cartridges for various applications including spray painting, petrochemical and chemical manufacturing, and pesticide spraying for concentrations up to 10 times the Permissible Exposure Limit (PEL) with half facepieces or 50 times PEL with full facepieces. Filter protects against 1) solids such as those from processing minerals, coal, iron ore, cotton, flour, and certain other substances; 2) liquids or oil based particles from sprays that do not emit harmful vapors; and 3) metal fumes produced from welding, brazing, cutting, and other operations involving heating of metals.