When properly fitted, use with appropriate cartridges for various applications including spray painting, lacquering, petrochemical and chemical manufacturing, pesticide spraying and agriculture for concentrations up to 10 times the permissible exposure limit (PEL) with half face pieces or 50 times PEL with full face pieces. Full face pieces must be quantitatively fit tested to claim assigned protection factor above 10 in negative pressure mode. Use with 603 adapter if only particulate protection is required. Do not use in environments that are immediately dangerous to life or health (IDLH).