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Total Inward Leakage (TIL) / Half-masks and Filtering Facepiece Respirators FY12

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.


  • Establish TIL testing capability and performance requirements for testing of Half-mask respirators for inclusion in 42 CFR Part 84.
Testing with Portacount

Applicable Standards

  • 42 CFR Part 84

Key Partners

  • Respirator Manufacturers



  • OSHA
  • Manufacturers
  • Employers
  • Labor Unions
  • Respirator Users

Project Scope

  • Establish a new class of half-mask respirators having an inward leakage requirement


  • 2Q Develop an Inter-panel variability test protocol
  • 3Q Conduct Inter-panel variability study
  • 4Q Prepare study report and peer review
  • 4Q update NPRM to reflect study results
  • 4Q NIOSH Staffing of NPRM
  • 1Q FY13 Department Review (CDC/HHS staffing



  • TIL performance requirements for testing and certification in 42 CFR Part 84
  • Final rule


  • PPE designs that result in better overall fitting respirators for general industrial workers, healthcare workers and emergency responders.
Page last updated: April 17, 2012
Page last reviewed: April 17, 2012
Content Source: National Institute for Occupational Safety and Health (NIOSH)
National Personal Protective Technology Laboratory